期刊
ASTRONOMY & ASTROPHYSICS
卷 591, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201628455
关键词
stars: abundances; stars: chemically peculiar; planetary systems
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) [MINECO SEV-2011-0187, MINECO RYC-2013-14875]
- Fundacao para a Ciencia e Tecnologia, FCT (Portugal) [SFRH/BPD/76606/2011, SFRH/BPD/70574/2010]
- COST Action TD1308 through STSM grant [COST-STSM-TD 1308-32051]
- FCT through Investigador FCT [IF/00169/2012, IF/00028/2014]
- POPH/FSE (EC) by FEDER through the Programa Operacional de Factores de Competitividade - COMPETE
- Fundacao para a Ciencia e a Tecnologia (FCT) [UID/DIS/04434/2013 (POCI-01-0145-FEDER-007672), PTDC/FIS-AST/7073/2014, PTDC/FIS-AST/1526/2014]
- [MINECO AYA2014-56359-P]
Context. Carbon, nitrogen, and oxygen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation and evolution. Aims. We present a detailed spectroscopic analysis of 74 solar-type stars, 42 of which are known to harbour planets. We determine the nitrogen abundances of these stars and investigate a possible connection between N and the presence of planetary companions. Methods. We used VLT/UVES to obtain high-resolution near-UV spectra of our targets. Spectral synthesis of the NH band at 3360 angstrom was performed with the spectral synthesis codes MOOG and FITTING. Results. We identify several spectral windows from which accurate N abundance can be obtained. Nitrogen distributions for stars with and without planets show that planet hosts are nitrogen-rich when compared to single stars. However, given the linear trend between [N/Fe] vs. [Fe/H], this fact can be explained as being due to the metal-rich nature of planet hosts. Conclusions. We conclude that reliable N abundances can be derived for metal-rich solar type stars from the near UV molecular band at 3360 angstrom. We confirm a linear trend between [N/Fe] and metallicity expected from standard models of Galactic chemical evolution.
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