The Relationship of Sodium and Oxygen in Galactic Field RR Lyrae Stars. (29th December 2017)

• Record Type: Journal Article
• Authors: Andrievsky, S.; Wallerstein, G.; Korotin, S.; Lyashko, D.; Kovtyukh, V.; Tsymbal, V.; Davis, C. E.; Gomez, T.; Huang, W.; Farrell, E. M.
• Is Part Of: Publications of the Astronomical Society of the Pacific. Volume 130:Number 984(2018)
• Publication Date: 2017-12-29
• Subjects: variables: RR Lyrae -- globular clusters: general -- galactic field; Astronomy -- Periodicals; Astronomy; Periodicals; Periodicals; 520.5
• DOI: 10.1088/1538-3873/aa9783
• Languages: English
• ISSNs: 0004-6280

Abstract

Abstract: We analyzed 62 high-resolution spectra of 30 Galactic Field RR Lyrae-type stars with the aim of deriving their atmospheric parameters (T eff, , V t ), metallicity ([Fe/H]), radial velocities, and NLTE abundances of oxygen and sodium. We found that there is no clear anti-correlation between [O/Fe] and [Na/Fe] as is seen in globular clusters. On this basis, we conclude that the majority of field RR Lyrae-type stars should hardly be considered to be remnants of the dissolution of globular clusters.