Article
Astronomy & Astrophysics
F. Comeron, N. Schneider, A. A. Djupvik
Summary: The study focuses on the young stellar populations associated with two isolated globules, DR 18 and ECX 6-21, irradiated by O-type stars. It reveals embedded populations in both globules, with differences in evolution between the two main star-forming sites in ECX 6-21.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Mate Szilagyi, Maria Kun, Peter abraham, Gabor Marton
Summary: Using Gaia DR3 data, this study investigates the structure and kinematics of the Cepheus OB2 association and characterizes its star formation history, with particular focus on the Cepheus Bubble. Thirteen stellar groups belonging to Cep OB2 are identified using a clustering algorithm, with four older groups located inside the bubble and younger groups found on the periphery. The tangential velocities suggest different formation mechanisms, with some groups born in an expanding system of star-forming clouds and others formed due to collision with the expanding bubble.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. B. Orellana, M. S. De Biasi, L. G. Paiz
Summary: The study reveals the existence of different substructures in the Cygnus OB2 region, with analysis of high-quality data enabling identification of members, mean proper motions, and distances for each overdensity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alexis L. Quintana, Nicholas J. Wright
Summary: This study reexamines the existence and membership of the Cygnus OB associations, identifying six new associations with two resembling the historical Cyg OB2 and OB3. The properties of the new associations and their expansion trends are consistent with typical values for OB associations. Large-scale kinematic expansion patterns across the Cygnus region are attributed to feedback from previous generations of stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. W. Broderick, T. D. Russell, R. P. Fender, S. A. Trushkin, D. A. Green, J. Chauhan, N. A. Nizhelskij, P. G. Tsybulev, N. N. Bursov, A. Shevchenko, G. G. Pooley, D. R. A. Williams, J. S. Bright, A. Rowlinson, S. Corbel
Summary: In this study, we present low-frequency radio observations of flaring activity from the X-ray binary Cygnus X-3 during May 2019 using LOFAR. By comparing our observations with data from other telescopes, we found correlations between the flux density levels at 143.5 MHz and higher frequency flaring activity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. J. van der Walt, L. E. Kristensen, J. K. Jorgensen, H. Calcutt, S. Manigand, M. el Akel, R. T. Garrod, K. Qiu
Summary: By conducting high-angular-resolution interferometric observations in a high-mass protostellar source, researchers identified approximately 400 lines attributed to 29 different molecular species. Chemical differentiation was observed along a gradient, indicating that the origin of COM emission may be related to young stellar sources and accretion of infalling material onto a disc-like structure surrounding a young protostar.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
H. Beuther, F. Wyrowski, K. M. Menten, J. M. Winters, S. Suri, W. -J. Kim, L. Bouscasse, C. Gieser, M. Sawczuck, I. B. Christensen, I. M. Skretas
Summary: This study investigates the connection between large-scale interstellar material and small-scale cores by analyzing observational data from Cygnus X. The results reveal the presence of dynamical cloud components and low-temperature regions, as well as indications of active star formation.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
E. Flaccomio, J. F. Albacete-Colombo, J. J. Drake, M. G. Guarcello, V. Kashyap, N. J. Wright, K. Briggs, B. Ercolano, M. McCollough, S. Sciortino
Summary: We analyze the X-ray spectra of about 8000 sources detected in the Cygnus OB2 Chandra Legacy Survey to study the coronal plasma and X-ray luminosities of young low-mass stars in the region. We use different strategies for sources with more or less than 20 detected photons, fitting the spectra with absorbed isothermal models or using a conversion factor from detected photon flux to intrinsic flux. Our results show consistent ratios between optical and X-ray extinction with standard Galactic values, and the abundance patterns are similar to those found in the Orion Nebula Cluster.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
J. F. Albacete-Colombo, J. J. Drake, E. Flaccomio, N. J. Wright, V. Kashyap, M. G. Guarcello, K. Briggs, J. E. Drew, D. M. Fenech, G. Micela, M. Mccollough, R. K. Prinja, N. Schneider, S. Sciortino, J. S. Vink
Summary: This study investigates the diffuse X-ray emission in the nearby Cygnus OB2 stellar association and discovers large-scale diffuse X-ray emission. Through X-ray spectral analysis, the total X-ray luminosity and plasma temperature components of the diffuse X-ray emission are calculated. The diffuse X-ray emission coincides with low-extinction regions, likely caused by the interaction between stellar winds and the local interstellar medium.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
Nicholas J. Wright, Jeremy J. Drake, Mario G. Guarcello, Tom L. Aldcroft, Vinay L. Kashyap, Francesco Damiani, Joe Depasquale, Antonella Fruscione
Summary: The Cygnus OB2 association is a major concentration of young and massive stars near the Sun, and a Chandra X-ray Observatory survey has provided a catalog of 8000 X-ray point sources. The survey design utilized a grid of overlapping pointings to overcome low off-axis sensitivity.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
J. A. Molina Lera, R. Gamen, S. Cichowolski, G. Baume, S. B. Cardenas
Summary: The Cygnus region is rich in diverse stellar complexes, making it an ideal location for studying recently formed stellar clusters. By analyzing the cluster DB2001-22 and its surroundings, researchers identified new massive stars and observed structures sculpted by these stars. The presence of young stellar objects suggests that star formation in the region may have been induced by the earliest stars in the cluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Saumya Gupta, Jessy Jose, Surhud More, Swagat R. Das, Gregory J. Herczeg, Manash R. Samal, Zhen Guo, Prem Prakash, Belinda Damian, Michihiro Takami, Satoko Takahashi, Katsuo Ogura, Tsuyoshi Terai, Tae-Soo Pyo
Summary: This study focuses on investigating the impact of stellar feedback on the IMF, brown dwarf fraction, and circumstellar disc properties in the Cygnus OB2 region through deep multiwavelength observations. The research reveals the presence of a distinct pre-main sequence branch, with a median age of approximately 5 million years and an average disc fraction of around 9% in the region. With a deep HSC catalogue as the foundation, further studies on this active young cluster are facilitated.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. G. Guarcello, J. J. Drake, N. J. Wright, J. F. Albacete-Colombo, C. Clarke, B. Ercolano, E. Flaccomio, V. Kashyap, G. Micela, T. Naylor, N. Schneider, S. Sciortino, J. S. Vink
Summary: In our Galaxy, star formation occurs in various environments, including clusters hosting massive stars. This paper focuses on the nearby massive association Cyg OB2 and analyzes the correlation between the spatial variation of the disk fraction and local values of ultraviolet radiation fields and stellar surface density. The results show that disks are more rapidly dissipated in regions with intense UV fields and large stellar density, with FUV radiation dominating the dissipation timescales near the O stars.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
G. A. Galazutdinov, J. Krelowski
Summary: This paper describes the specific profile of the narrowest known strong diffuse interstellar band (DIB) 6196 & ANGS; in objects belonging to the Sco OB2 association. The split and broadened profiles of the 6196 DIB in reddened Sco OB2 objects cannot be explained by the presence of multiple clouds with different radial velocities. The split profiles may be composed of the band center and its head of an unknown molecule.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. el Akel, L. E. Kristensen, R. Le Gal, S. J. van der Walt, R. L. Pitts, F. Dulieu
Summary: This study investigates the chemistry of sulphur-bearing species in the interstellar medium through laboratory experiments and observations. It identifies OCS as an important solid-state S-reservoir and reveals differences in S-diversity between cold envelopes and hot cores in star-forming regions. The spatial distribution of sulphur-bearing molecules serves as good tracers to connect hot and cold chemistry within observed objects.
ASTRONOMY & ASTROPHYSICS
(2022)