Based on published parameters of their atmospheres, the masses of 100 RR Lyrae variables (lyrids) in the field are determined using evolutionary tracks from the Dartmouth data base and the properties of lyrids with different metallicities are compared. It was found that the masses of the metal-rich ([Fe/H] > –0.5) lyrids with thin-disk kinematics lie within an interval of (0.51-0.60) M ʘ . According to modern concepts, the initial masses of these stars should be no more than (0.7-0.8) M ʘ . The long evolution time of these low-mass stars conflicts with the significantly lower age of even the oldest stars in the thin-disk subsystem of the Galaxy. A possible explanation is proposed for the nature of these comparatively young and metal-rich variables.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
B. V. Kukarkin, An Investigation of the Structure and Development of Star Systems based on a Study of Variable Stars [in Russian], Gosudarstvennoe izdatel’stvo tekhniko-teoreticheskoi literatury (1949), 191 pp.
G. Preston, Astrophys. J. 130, 507 (1959).
V. A. Marsakov, M. L. Gozha, and V. V. Koval’, Astron. Rep. 62, 50 (2018).
V. A. Marsakov, M. L. Gozha, V. V. Koval’, et al., Astrophysics 61, 171 (2018).
M. L. Gozha, V. A. Marsakov, and V. V. Koval’, Astrophysics 61, 41 (2018).
M. Marconi, G. Coppola, G. Bono, et al., Astrophys. J. 808, 5 (2015).
R. E. Taam, R. P. Kraft, and N. Suntzeff, Astrophys. J. 207, 201 (1976).
M. Chadid, C. Sneden, and G. W. Preston, Astrophys. J. 835, 187 (2017).
V. A. Marsakov, M. L. Gozha, and V. V. Koval’, Astron. Rep. 62, 1095 (2018).
M. L. Gozha, V. A. Marsakov, and V. V. Koval’, Astrophysics 62, 369 (2019).
A. Dotter, B. Chaboyer, D. Jevremovic, et al., Astrophys. J. Suppl. Ser. 178, 89, (2008), http://stellar.dartmouth.edu/models/index.html
V. A. Marsakov, M. L. Gozha, and V. V. Koval’, Astron. Rep. 63, 2003 (2019).
T. Bensby, S. Feldzing, and I. Lungstrem, Astron. Astrophys. 410, 527 (2003).
T. V. Borkova and V. A. Marsakov, Astron Rep. 44. 665 (2000).
R. G. Gratton, E. Carretta, R. Claudi, et al., Astron. Astrophys. 404, 187 (2003).
V. A. Marsakov, M. L. Gozha, V. V. Koval’, et al., Astron. Rep. 60, 43 (2016).
V. A. Marsakov and T. V. Borkova, Astron. Lett. 31. 515 (2005).
V. A. Marsakov and T. V. Borkova, Astron. Lett. 32. 376 (2006).
R. Schonrich and J. Binney, Mon. Not. Roy. Astron. Soc. 396, 203 (2009).
X. Fu, A. Bressan, P. Marigo, et al., Mon. Not. Roy. Astron. Soc. 476, 496 (2018).
M. Marconi and D. Minniti, Astrophys. J. 853, 20 (2018).
P. Pietrukowicz, S. Kozlowski, J. Skowron, et al., Astrophys. J. 811, 113 (2015).
Y.-W. Lee and S. Jang, Astrophys. J. 833, 236 (2016).
T. Muraveva, H. E. Delgado, G. Clementini, et al., Mon. Not. Roy. Astron. Soc. 481, 1195 (2018).
A. K. Dambis, L. N. Berdnikov, A. Y. Kniazev, et al., Mon. Not. Roy. Astron. Soc. 435, 3206 (2013).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated from Astrofizika, Vol. 62, No. 4, pp. 519-528 (November 2019)
Rights and permissions
About this article
Cite this article
Marsakov, V.A., Gozha, M.L. & Koval’, V.V. The Nature of Young RR Lyrae Field Stars with Solar Metallicity. Astrophysics 62, 467–474 (2019). https://doi.org/10.1007/s10511-019-09596-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10511-019-09596-1