期刊
ASTRONOMY & ASTROPHYSICS
卷 489, 期 2, 页码 885-910出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810044
关键词
atlases; stars : fundamental parameters; globular clusters : general; galaxies : stellar content
资金
- Spanish research projects [AYA2006-14318, AYA2006-15698-C02-02, AYA2007-67752C03-03]
- European Social Found for a Formacion de Personal Investigador [AYA2003-01840]
- Marie Curie Intra-European Fellowship
Context. The analysis of unresolved stellar populations demands evolutionary synthesis models with realistic physical ingredients and extended wavelength coverage. Aims. We quantitatively describe the first CO bandhead at 2.3 mu m to allow stellar population models to provide improved predictions in this wavelength range. Methods. We observed a new stellar library with a better coverage of the stellar atmospheric parameter space than in earlier works. We performed a detailed analysis of the robustness of previous CO index definitions with spectral resolution, wavelength calibration, signal-to-noise ratio, and flux calibration. Results. We define a new line-strength index for the first CO bandhead at 2.3 mu m, DCO, better suited for stellar population studies than previous index definitions. We derive empirical fitting functions for the CO feature as a function of the stellar parameters (T-eff, log g and [Fe/H]), showing a detailed quantitative metallicity dependence.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据