Investigating APOKASC Red Giant Stars with Abnormal Carbon-to-nitrogen Ratios

被引：5

作者：

Bufanda, Erica ^{[1
]}

Tayar, Jamie ^{[1
,2
]}

Huber, Daniel ^{[1
]}

Hasselquist, Sten ^{[3
]}

Lane, Richard R. ^{[4
]}

机构：

[1] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[2] Univ Florida, Bryant Space Sci Ctr, Dept Astron, Stadium Rd, Gainesville, FL 32611 USA

[3] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[4] Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago, Chile

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 959卷 / 02期

基金：

美国国家航空航天局;

关键词：

KEPLER LIGHT CURVES; GALACTIC DISK; DATA RELEASE; APOGEE DATA; BINARY STARS; MILKY-WAY; ROTATION; EVOLUTION; YOUNG; ABUNDANCES;

D O I：

10.3847/1538-4357/acf9a5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The success of galactic archeology and the reconstruction of the formation history of our Galaxy relies critically on precise ages for large populations of stars. For evolved stars in the red clump and red giant branch, the carbon-to-nitrogen ratio ([C/N]) has recently been identified as a powerful diagnostic of mass and age that can be applied to stellar samples from spectroscopic surveys such as Sloan Digital Sky Survey/APOGEE. Here, we show that at least 10% of red clump stars and red giant branch stars deviate from the standard relationship between [C/N] and mass. We use the APOGEE-Kepler (APOKASC) overlap sample to show that binary interactions are responsible for the majority of these outliers and that stars with indicators of current or previous binarity should be excluded from galactic archeology analyses that rely on [C/N] abundances to infer stellar masses. We also show that the Data Release 14 APOGEE analysis overestimates the surface gravities for even moderately rotating giants (vsini > 2 km s(-1)).

引用

页数：11

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