NAOC Open IR
Influence of the convective mixing-length parameter α on the chemical abundances in the case of metal-poor giant HD 122563
Song Nan; Alexeeva Sofya; Zhao Gang
2020
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume20Issue:8
AbstractOne-dimensional (1D) model atmospheres are still the most commonly used tool for the determination of stellar chemical composition. Convection in the model is usually treated by mixing-length theory (MLT). The mixing-length parameter α is generally calibrated from the Sun and applied to all other stars. The metal-poor giant, HD 122563, is an important benchmark star to test stellar atmosphere and interior physics. We investigate the influence of the convection mixing-length parameter α on the determination of chemical abundances of Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Sr, Y, Zr and Ba in the case of HD 122563, taking advantage of a high resolution and high signal-to-noise ratio HARPS spectrum. The abundance discrepancies ?X/H that occur due to α variation rarely exceed 0.05 dex and most are less than 0.03 dex. We calculate the discrepancy ?X/H using a line-by-line differential analysis. The abundance discrepancies do not have direct relation with either line strength or the excitation potential. For 1D stellar atmospheric analysis of HD 122563, the accuracy of abundance determination does not strongly depend on the choice of mixing-length parameter α (causing average discrepancies of < 0.03 dex), while the uncertainties in the effective temperature and surface gravity play a more important role.
Keywordstars: abundances convection stars: atmospheres line: profiles
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/74409
Collection中国科学院国家天文台
Affiliation中国科学院国家天文台
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Song Nan,Alexeeva Sofya,Zhao Gang. Influence of the convective mixing-length parameter α on the chemical abundances in the case of metal-poor giant HD 122563[J]. Research in Astronomy and Astrophysics,2020,20(8).
APA Song Nan,Alexeeva Sofya,&Zhao Gang.(2020).Influence of the convective mixing-length parameter α on the chemical abundances in the case of metal-poor giant HD 122563.Research in Astronomy and Astrophysics,20(8).
MLA Song Nan,et al."Influence of the convective mixing-length parameter α on the chemical abundances in the case of metal-poor giant HD 122563".Research in Astronomy and Astrophysics 20.8(2020).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Song Nan]'s Articles
[Alexeeva Sofya]'s Articles
[Zhao Gang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Song Nan]'s Articles
[Alexeeva Sofya]'s Articles
[Zhao Gang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Song Nan]'s Articles
[Alexeeva Sofya]'s Articles
[Zhao Gang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.