Abundance analysis of two late A-type stars HD 32115 and HD 37594

被引:30
作者
Bikmaev, IF
Ryabchikova, TA
Bruntt, H
Musaev, FA
Mashonkina, LI
Belyakova, EV
Shimansky, VV
Barklem, PS
Galazutdinov, G
机构
[1] Russian Acad Sci, Inst Astron, Moscow 109017, Russia
[2] Kazan VI Lenin State Univ, Dept Astron, Kazan 420008, Russia
[3] Univ Vienna, Inst Astron, A-1180 Vienna, Austria
[4] Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark
[5] RAS, Special Astrophys Observ, Nizhnii Novgorod 369167, Karachai Circas, Russia
[6] Isaac Newton INst, SAO Branch, Santiago, Chile
[7] Natl Acad Sci Ukraine, ICAMER, Peak Terskol 361605, Kabardino Balka, Russia
[8] Uppsala Univ, Dept Space Phys & Astron, S-75120 Uppsala, Sweden
来源
ASTRONOMY & ASTROPHYSICS | 2002年 / 389卷 / 02期
关键词
stars : atmospheres; stars : abundances; stars; individual; HD; 32115; HD37594;
D O I
10.1051/0004-6361:20020593
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have performed abundance analysis of two slowly rotating, late A-type stars, HD 32115 (HR 1613) and HD 37594 (HR 1940), based on obtained echelle spectra covering the spectral range 4000-9850 Angstrom. These spectra allowed us to identify an extensive line list for 31 chemical elements, the most complete to date for A-type stars. Two approaches to abundance analysis were used, namely a "manual" (interactive) and a semi-automatic procedure for comparison of synthetic and observed spectra and equivalent widths. For some elements non-LTE (NLTE) calculations were carried out and the corresponding corrections have been applied. The abundance pattern of HD 32115 was found to be very close to the solar abundance pattern, and thus may be used as an abundance standard for chemical composition studies in middle and late A stars. Further, its Halpha line profile shows no core-to-wing anomaly like that found for cool Ap stars and therefore also may be used as a standard in comparative studies of the atmospheric structures of cool, slowly rotating Ap stars. HD 37594 shows a metal deficiency at the level of -0.3 dex for most elements and triangle-like cores of spectral lines. This star most probably belongs to the delta Sct group.
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页码:537 / 546
页数:10
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