Article
Astronomy & Astrophysics
M. Fouesneau, R. Andrae, T. Dharmawardena, J. Rybizki, C. A. L. Bailer-Jones, M. Demleitner
Summary: This paper introduces a uniformly derived all-sky catalog of stellar astrophysical parameters, providing insights into the physical properties of Milky Way stars. It validates the results by comparing with other work and highlights the usefulness of Gaia parallaxes in exploring the detailed structures of the interstellar medium in our Galaxy. It also discusses the potential of using Gaia DR3 data to break through limitations and infer stellar chemistry.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
F. Anders, A. Khalatyan, A. B. A. Queiroz, C. Chiappini, J. Ardevol, L. Casamiquela, F. Figueras, O. Jimenez-Arranz, C. Jordi, M. Monguio, M. Romero-Gomez, D. Altamirano, T. Antoja, R. Assaad, T. Cantat-Gaudin, A. Castro-Ginard, H. Enke, L. Girardi, G. Guiglion, S. Khan, X. Luri, A. Miglio, I Minchev, P. Ramos, B. X. Santiago, M. Steinmetz
Summary: This article presents a catalogue of 362 million stellar parameters, distances, and extinctions derived from Gaia's Early Data Release (EDR3) cross-matched with other photometric catalogues. The results show improved accuracy and precision compared to previous estimates, validated by comparisons with other measurements. The article also provides visual representations of stellar density and substructures in the Milky Way and beyond.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Francisco Molina, Joris Vos, Peter Nemeth, Roy Ostensen, Maja Vuckovic, Andrew Tkachenko, Hans van Winckel
Summary: This study solves the orbital and atmospheric parameters of two long-period sdO binaries and investigates the chemical composition of their main-sequence companions for the first time. The results show a depletion of yttrium in both systems and a C overabundance in BD-11(o)162. Feige 80 matches the same correlation as the majority of the systems, while BD-11(o)162 is an exceptional system with a lower mass and a higher progenitor mass may have caused the C overabundance. The depletion of yttrium in the MS companions could indicate the existence of a circumbinary disk in these systems' pasts.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
C. Hawcroft, H. Sana, L. Mahy, J. O. Sundqvist, M. Abdul-Masih, J. C. Bouret, S. A. Brands, A. de Koter, F. A. Driessen, J. Puls
Summary: The study investigates the impact of optically thick clumping on spectroscopic stellar wind diagnostics in O supergiants and provides empirical constraints on various wind parameters. By including optically thick clumping, the study was able to simultaneously fit optical and ultraviolet spectra without reducing the phosphorus abundance. Additionally, the study reveals the distribution of clumps in the wind velocity field and the density of the interclump medium.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Paul A. Crowther, Patrick S. Broos, Leisa K. Townsley, Andy M. T. Pollock, Katie A. Tehrani, Marc Gagne
Summary: This study reassesses the L-X/L-Bol relation for early-type stars by comparing spectroscopic analysis and X-ray survey data. The results show that the majority of stars have consistent L-X/L-Bol ratios, but O-type stars have relatively harder X-ray emission.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V Ripepi, G. Catanzaro, R. Molinaro, M. Gatto, G. De Somma, M. Marconi, M. Romaniello, S. Leccia, I Musella, E. Trentin, G. Clementini, V Testa, F. Cusano, J. Storm
Summary: Classical Cepheids are crucial for the extragalactic distance scale, with their period-luminosity and period-Wesenheit relations showing dependency on metallicity. This metallicity dependence significantly affects the intercept of the PLZ/PWZ relations, indicating a larger impact than previously thought. However, it remains inconclusive whether the slope of these relationships also depends on metallicity. The correction of Gaia parallaxes' zero-point offset reduces the size of metallicity dependence on the PLZ/PWZ relations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
E. Trentin, V Ripepi, G. Catanzaro, J. Storm, M. Marconi, G. De Somma, V Testa, I Musella
Summary: This article examines the faintest classical Cepheids in the Milky Way, deriving atmospheric parameters, radial velocities, and abundances for each star. By comparing the data with previous studies, the authors find a metallicity gradient in the Galactic disc and a possible break in the gradient at R-GC = 9.25 kpc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. L. Medina Rodriguez, S. Zharikov, J. Kara, M. Wolf, A. Agishev, S. Khokhlov
Summary: In this study, we analyzed new observational data of SDSS J154453.60+255348.8 to determine its nature and system parameters. We found that the system consists of a white dwarf with a mass of 0.62 solar masses and an evolved red dwarf as a secondary. The system has a high inclination angle of close to 90 degrees and a mass ratio of 0.49. The observations of the system in high- and low-brightness states led us to conclude that it is a VY Scl-type system with a long orbital period, and the accretion disc is significantly different in the two states.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
D. Graczyk, G. Pietrzynski, C. Galan, J. Southworth, W. Gieren, M. Kaluszynski, B. Zgirski, A. Gallenne, M. Gorski, G. Hajdu, P. Karczmarek, P. Kervella, P. F. L. Maxted, N. Nardetto, W. Narloch, B. Pilecki, W. Pych, G. Rojas Garcia, J. Storm, K. Suchomska, M. Taormina, P. Wielgorski
Summary: This article presents the study of ten double-lined detached eclipsing binary stars with high-precision parallaxes, providing precise absolute dimensions and physical parameters. The results include the discovery of slow apsidal motion and the presence of metallic-line components. These findings contribute to the improvement of calibrations for surface brightness - colour relations and the prediction accuracy of stellar angular diameters.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Yildiz
Summary: For solar-like oscillators, the asteroseismic relations connecting stellar properties to oscillation observables have been extended beyond their theoretical domain and applied to red giant stars. However, biases exist and attempts to parametrize the departure of the relations for evolved stars have been made. In this study, a new parametrization based on Gaia parallax data is proposed for red giants, showing dependencies on metallicity and effective temperature.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Yildiz, S. Ortel
Summary: By comparing parallax and asteroseismic distances, researchers established an empirical relation between large frequency separation and mean density, leading to more accurate determination of stellar mass and radius. The study also discussed the effects of effective temperature and parallax offset on stellar parameters, obtaining precise values through careful data analysis. Results for red giants were found to be consistent with previous studies, affirming the reliability of the methodology employed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. Salsi, N. Nardetto, D. Mourard, D. Graczyk, M. Taormina, O. Creevey, V. Hocde, F. Morand, K. Perraut, G. Pietrzynski, G. H. Schaefer
Summary: This study aims to develop a precise SBCR for early-type B and A stars using selection criteria based on stellar characteristics and combined with homogeneous interferometric angular diameter measurements. Additionally, improvements in SBCRs for late-type stars, especially in the Gaia photometric band, were made. The results show that significant progress has been made in determining extragalactic distances using early-type eclipsing binaries.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Geza Kovacs, Behrooz Karamiqucham
Summary: The study combines observational data with models to derive average luminosities for RR Lyrae stars and finds that they are in agreement with high accuracy parallax measurements. However, about 10% of the sample shows a curious distance keeping behavior between evolutionary and pulsation models, which may be addressed by increasing reddening excessively.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Yanjun Guo, Bo Zhang, Chao Liu, Jiao Li, Jiangdan Li, Luqian Wang, Zhicun Liu, Yong-Hui Hou, Zhanwen Han, Xuefei Chen
Summary: This study uses the SLAM technique to analyze LAMOST spectra, inferring the stellar parameters of 3931 early-type stars. The results show that LRS spectra better constrain temperature, gravity, and metallicity than MRS spectra, while MRS spectra better constrain rotational velocity.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2021)
Article
Astronomy & Astrophysics
P. Cristofari, J-F Donati, T. Masseron, P. Fouque, C. Moutou, X. Delfosse, E. Artigau, C. P. Folsom, A. Carmona, E. Gaidos, J-D do Nascimento, F. Jahandar, G. Hebrard
Summary: This study presents the results of a comparison between observed spectra and synthetic spectra models for M dwarfs. The choice of model has a significant impact on the derived parameters, and discrepancies were found between the two models used in the study. The precision of the parameters was optimized, and the results were in good agreement with reference literature studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Dorsch, N. Reindl, I Pelisoli, U. Heber, S. Geier, A. G. Istrate, S. Justham
Summary: This paper reports the discovery of a strongly magnetic helium-rich hot subdwarf star (He-sdO) and presents the first spectroscopic analysis of any magnetic hot subdwarf. The study provides overwhelming evidence for the double-degenerate merger scenario based on the determined atmospheric parameters, metal abundances, and strong magnetic field.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Thomas Kupfer, Evan B. Bauer, Jan van Roestel, Eric C. Bellm, Lars Bildsten, Jim Fuller, Thomas A. Prince, Ulrich Heber, Stephan Geier, Matthew J. Green, Shrinivas R. Kulkarni, Steven Bloemen, Russ R. Laher, Ben Rusholme, David Schneider
Summary: We present the discovery of a new double-detonation progenitor system composed of a hot subdwarf B binary and a white dwarf companion. By analyzing the spectroscopic observations and light curve fits, the physical parameters of the system were estimated and the future evolution was predicted. These findings are important for understanding the formation mechanisms of double-detonation progenitor systems and thermonuclear supernovae.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Miroslav D. Filipovic, J. L. Payne, R. Z. E. Alsaberi, R. P. Norris, P. J. Macgregor, L. Rudnick, B. S. Koribalski, D. Leahy, L. Ducci, R. Kothes, H. Andernach, L. Barnes, I. S. Bojicic, L. M. Bozzetto, R. Brose, J. D. Collier, E. J. Crawford, R. M. Crocker, S. Dai, T. J. Galvin, F. Haberl, U. Heber, T. Hill, A. M. Hopkins, N. Hurley-Walker, A. Ingallinera, T. Jarrett, P. J. Kavanagh, E. Lenc, K. J. Luken, D. Mackey, P. Manojlovic, P. Maggi, C. Maitra, C. M. Pennock, S. Points, S. Riggi, G. Rowell, S. Safi-Harb, H. Sano, M. Sasaki, S. Shabala, J. Stevens, J. Th van Loon, N. F. H. Tothill, G. Umana, D. Urosevic, V. Velovic, T. Vernstrom, J. L. West, Z. Wan
Summary: We report the discovery of J0624-6948, a low-surface brightness radio ring located between the Galactic Plane and the Large Magellanic Cloud (LMC). This source shares similarities with odd radio circles (ORCs) but also exhibits significant differences, suggesting it may be a different type of object. The most plausible explanation is that it is an intergalactic supernova remnant resulting from a single-degenerate type Ia supernova in the outskirts of the LMC.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Todd C. Hillwig, Nicole Reindl, Hannah M. Rotter, Adam W. Rengstorf, Ulrich Heber, Andreas Irrgang
Summary: In the survey of central stars of planetary nebulae, two newly discovered binary systems were identified. Physical parameters and the possibility of true planetary nebula for these systems were discussed based on spectral modeling and observational data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Bhat, A. Irrgang, U. Heber
Summary: Runaway stars are ejected from their place of birth in the Galactic disk through violent ejection processes. They may originate from young open clusters and be ejected either through N-body interactions or binary supernova explosions. With the help of Gaia astrometry, the kinematics of young runaway stars can be studied with high precision, allowing for the identification of their origin in open stellar clusters even when they are far away. A minimization method has been developed to determine whether objects come from the same place, which has been tested on samples of Orion runaways. Trajectories of known runaway stars have been calculated using this fitting procedure based on Gaia data and updated radial velocities. The study also investigates the ejection mechanisms for the runaway stars by identifying parent clusters based on their trajectories and analyzing cluster age and flight time.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Bonavita, R. Gratton, S. Desidera, V Squicciarini, V D'Orazi, A. Zurlo, B. Biller, G. Chauvin, C. Fontanive, M. Janson, S. Messina, F. Menard, M. Meyer, A. Vigan, H. Avenhaus, R. Asensio Torres, J-L Beuzit, A. Boccaletti, M. Bonnefoy, W. Brandner, F. Cantalloube, A. Cheetham, M. Cudel, S. Daemgen, P. Delorme, C. Desgrange, C. Dominik, N. Engler, P. Feautrier, M. Feldt, R. Galicher, A. Garufi, D. Gasparri, C. Ginski, J. Girard, A. Grandjean, J. Hagelberg, T. Henning, S. Hunziker, M. Kasper, M. Keppler, E. Lagadec, A-M Lagrange, M. Langlois, J. Lannier, C. Lazzoni, H. Le Coroller, R. Ligi, M. Lombart, A-L Maire, S. Mazevet, D. Mesa, D. Mouillet, C. Moutou, A. Muller, S. Peretti, C. Perrot, S. Petrus, A. Potier, J. Ramos, E. Rickman, D. Rouan, G. Salter, M. Samland, T. Schmidt, E. Sissa, T. Stolker, J. Szulagyi, M. Turatto, S. Udry, F. Wildi
Summary: The SHINE survey observed multiple stellar systems, with 27% of systems having three or more components. By combining different data sources, the orbits of 25 systems were constrained. The results highlight the importance of combining different techniques for complex problems and the usefulness of large samples.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Geier, M. Dorsch, I Pelisoli, N. Reindl, U. Heber, A. Irrgang
Summary: Hot subdwarf stars are likely formed by close binary interactions and represent a late stage in the evolution of low-mass stars. A study of radial velocity variability reveals completely different behavior between He-poor and He-rich hot subdwarfs. There is likely no evolutionary connection between these subtypes, and the majority of hot subdwarf stars are formed through binary merger channels.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Gavin Ramsay, Patrick A. Woudt, Thomas Kupfer, Jan van Roestel, Kerry Paterson, Brian Warner, David A. H. Buckley, Paul J. Groot, Ulrich Heber, Andreas Irrgang, C. Simon Jeffery, Mokhine Motsoaledi, Martinus J. Schwartz, Thomas Wevers
Summary: Blue Large-Amplitude Pulsators (BLAPs) are a new class of blue variable stars that show periodic variations in their light curves with short periods and high amplitudes. Nine blue variable stars were identified in the OmegaWhite survey, showing a periodic modulation with periods ranging from 7 to 37 minutes and amplitudes ranging from 0.11 to 0.28 mag. Follow-up observations using SALT and telescopes at SAAO revealed four stars that are identified as BLAPs. One star belongs to the V361 Hya class of pulsating stars and is located near an extended nebula. Another star shows characteristics similar to sdAV pulsators. In contrast, one binary star system contains an sdB and a white dwarf with an orbital period of 73.7 minutes, which is one of only six white dwarf-sdB binaries with a period shorter than 80 minutes. High cadence photometry of four candidate BLAPs shows features that resemble notch-like features seen in longer period Cepheid pulsators.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
R. Abuter, F. Allouche, A. Amorim, C. Bailet, M. Bauboeck, J-P Berger, P. Berio, A. Bigioli, O. Boebion, M. L. Bolzer, H. Bonnet, G. Bourdarot, P. Bourget, W. Brandner, Y. Clenet, B. Courtney-Barrer, Y. Dallilar, R. Davies, D. Defrere, A. Delboulbe, F. Delplancke, R. Dembet, P. T. de Zeeuw, A. Drescher, A. Eckart, C. Edouard, F. Eisenhauer, M. Fabricius, H. Feuchtgruber, G. Finger, N. M. Foerster Schreiber, E. Garcia, P. Garcia, F. Gao, E. Gendron, R. Genzel, J. P. Gil, S. Gillessen, T. Gomes, F. Gonte, C. Gouvret, P. Guajardo, S. Guieu, M. Hartl, X. Haubois, F. Haussmann, G. Heissel, Th Henning, S. Hippler, S. Honig, M. Horrobin, N. Hubin, E. Jacqmart, L. Jochum, L. Jocou, A. Kaufer, P. Kervella, H. Korhonen, L. Kreidberg, S. Lacour, S. Lagarde, O. Lai, V Lapeyrere, R. Laugier, J-B Le Bouquin, J. Leftley, P. Lena, D. Lutz, F. Mang, A. Marcotto, D. Maurel, A. Merand, F. Millour, N. More, H. Nowacki, M. Nowak, S. Oberti, T. Ott, L. Pallanca, T. Paumard, K. Perraut, G. Perrin, R. Petrov, O. Pfuhl, N. Pourre, S. Rabien, C. Rau, S. Robbe-Dubois, S. Rochat, M. Salman, M. Scholler, J. Schubert, N. Schuhler, J. Shangguan, T. Shimizu, S. Scheithauer, A. Sevin, F. Soulez, A. Spang, E. Stadler, J. Stadler, C. Straubmeier, E. Sturm, L. J. Tacconi, K. R. W. Tristram, F. Vincent, S. von Fellenberg, S. Uysal, F. Widmann, E. Wieprecht, E. Wiezorrek, J. Woillez, S. Yazici, A. Young, G. Zins
Summary: GRAVITY+ is an upgraded version of GRAVITY and VLTI that enables fainter, all-sky, high-contrast, milliarcsecond interferometry with wide-separation fringe tracking, new adaptive optics, and laser guide stars. GRAVITY Wide, the first phase of GRAVITY+, increases the maximum separation between the science target and the reference star, resulting in a significant increase in the sky-coverage and enabling observations of faint objects and extragalactic sky. The initial observations have provided valuable insights and predictions for future planning.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
D. Sebastian, E. W. Guenther, M. Deleuil, M. Dorsch, U. Heber, C. Heuser, D. Gandolfi, S. Grziwa, H. J. Deeg, R. Alonso, F. Bouchy, Sz Csizmadia, F. Cusano, M. Fridlund, S. Geier, A. Irrgang, J. Korth, D. Nespral, H. Rauer, L. Tal-Or
Summary: The theories of planet formation have conflicting results regarding the frequency of close-in giant planets around intermediate mass stars (IMSs). In this study, the CoRoT survey is used to determine the absolute frequency of IMSs with close-in gas giants and compare it to solar-like stars. The results show that the frequency of close-in giant planets around IMSs is significantly lower than that around solar-mass stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Andreas Irrgang, Norbert Przybilla, Georges Meynet
Summary: Based on spectroscopic and photometric analysis, researchers have discovered that the bright B-type star Columbae is a stripped pulsating core, providing valuable insights into nuclear astrophysics and common-envelope evolution.