Synthetic horizontal branch morphology for different metallicities and ages under tidally enhanced stellar wind
文献类型：期刊论文
| 作者 | Lei ZX(雷振新)1,2,3 ; Zhang FH(张奉辉)1,2; Ge HW(葛宏伟)1,2; Han ZW(韩占文)1,2
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2013-06 |
| 卷号 | 554页码:1-8 |
| ISSN号 | 0004-6361 |
| 关键词 | Hertzsprung-Russell and C-M diagrams stars: horizontal-branch stars: mass-loss globular clusters: general |
| 通讯作者 | Lei, ZX (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | Context. It is believed that some other parameters, except for metallicity (the first parameter), are needed to explain the horizontal branch (HB) morphology of globular clusters (GCs). Furthermore, these parameters are considered to be correlated with the mass loss of the red giant branch (RGB) stars. Unfortunately, the physics of mass loss on the RGB is poorly understood at present. In our previous work, we proposed that tidally enhanced stellar wind during binary evolution may affect the HB morphology by enhancing the mass loss of the red giant primary and that we can reproduce the basic morphology of HB in GCs. Aims. We did not consider the effects of other important parameters (e.g., metallicity and age) in our final results there. As a further study, we now investigate the effects of metallicity and age on HB morphology by considering tidally enhanced stellar winds during binary evolution. Methods. We incorporated the tidally enhanced-stellar-wind model of Tout & Eggleton into Eggleton's stellar evolution code to study the binary evolution. A group of binary system samples were generated by Monte Carlo simulations. The position of each sample star in a color-magnitude diagram was obtained by transforming temperature and luminosity into B - V color and absolute magnitude. To study the effects of metallicity and age on our final results, we conducted two sets of model calculations: (i) for a fixed age, we used three metallicities, namely Z = 0.0001, 0.001 and 0.02; (ii) for a fixed metallicity, Z = 0.001, we used five ages in our model calculations: 14, 13, 12, 10, 7 Gyr. Results. We found that HB morphology of GCs becomes bluer with decreasing metallicity, and old GCs present bluer HB morphology than young ones. These results are consistent with previous work. Although the envelope-mass distributions of zero-age HB stars produced by tidally enhanced stellar wind are similar for different metallicities, the synthetic HB under tidally enhanced stellar wind for Z = 0.02 presented a distinct gap between red and blue HB. However, this feature was not seen clearly in the synthetic HB for Z = 0.001 and 0.0001. We also found that higher binary fractions may make HB morphology become bluer, and we discuss the results with recent observations. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SUBDWARF-B-STARS ; CLUSTER NGC 6791 ; GLOBULAR-CLUSTERS ; MASS-LOSS ; EVOLUTIONARY SYNTHESIS ; RELATIVE AGES ; GIANT BRANCH ; ACS SURVEY ; MILKY-WAY ; OLD |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2013/06/aa20998-12/aa20998-12.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000320444200129 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4554]  |
| 专题 | 云南天文台_大样本恒星演化研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, the Chinese Academy of Sciences, 650011 KunMing, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, the Chinese Academy of Sciences, 650011 KunMing, PR China 3.University of the Chinese Academy of Sciences, Beijing 100049, PR China |
| 推荐引用方式 GB/T 7714 | Lei ZX,Zhang FH,Ge HW,et al. Synthetic horizontal branch morphology for different metallicities and ages under tidally enhanced stellar wind[J]. ASTRONOMY & ASTROPHYSICS,2013,554:1-8. |
| APA | Lei ZX,Zhang FH,Ge HW,&Han ZW.(2013).Synthetic horizontal branch morphology for different metallicities and ages under tidally enhanced stellar wind.ASTRONOMY & ASTROPHYSICS,554,1-8. |
| MLA | Lei ZX,et al."Synthetic horizontal branch morphology for different metallicities and ages under tidally enhanced stellar wind".ASTRONOMY & ASTROPHYSICS 554(2013):1-8. |
入库方式： OAI收割
来源：云南天文台
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