当前位置: X-MOL 学术Astrophysics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The Nature of Young RR Lyrae Field Stars with Solar Metallicity
Astrophysics ( IF 0.5 ) Pub Date : 2019-11-28 , DOI: 10.1007/s10511-019-09596-1
V. A. Marsakov , M. L. Gozha , V. V. Koval’

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.

中文翻译:

具有太阳金属性的年轻RR天琴星的性质

根据公开的大气参数,使用达特茅斯数据库中的演化轨迹确定野外100个RR天琴座变量(天琴座)的质量,并比较具有不同金属性的天琴座的性质。结果发现,与薄盘运动学的富金属(的[Fe / H]> -0.5)天琴流星群的质量位于的(0.51-0.60)M的间隔内 ʘ根据现代概念,这些恒星的初始质量应不超过(0.7-0.8)这些低质量恒星的长演化时间与银河系薄盘子系统中即使是最老恒星的年龄显着降低也相矛盾。对于这些相对年轻且富含金属的变量的性质,提出了一种可能的解释。
更新日期:2019-11-28
down
wechat
bug