Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines
We discuss here the results obtained in the determination of effective temperatures and metallicities of late-type stars. We provide the abundances of MgH, Ti ı and Ti װ, with a list of selected lines, for the red giant of Arcturus and the metal-poor K subdwarf G 224-58 A. The Sun was used as a temp...
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| Опубліковано в: : | Advances in Astronomy and Space Physics |
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| Дата: | 2016 |
| Автори: | , , , |
| Формат: | Стаття |
| Мова: | English |
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Головна астрономічна обсерваторія НАН України
2016
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/119944 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines / I.O. Kushniruk, Ya.V. Pavlenko, M.C. Gálvez-Ortiz, Z.H. Zhang // Advances in Astronomy and Space Physics. — 2016. — Т. 6., вип. 1. — С. 16-19. — Бібліогр.: 18 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-119944 |
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dspace |
| spelling |
Kushniruk, I.O. Pavlenko, Ya.V. Gálvez-Ortiz, M.C. Zhang, Z.H. 2017-06-10T13:12:29Z 2017-06-10T13:12:29Z 2016 Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines / I.O. Kushniruk, Ya.V. Pavlenko, M.C. Gálvez-Ortiz, Z.H. Zhang // Advances in Astronomy and Space Physics. — 2016. — Т. 6., вип. 1. — С. 16-19. — Бібліогр.: 18 назв. — англ. 2227-1481 DOI:10.17721/2227-1481.6.16-19 https://nasplib.isofts.kiev.ua/handle/123456789/119944 We discuss here the results obtained in the determination of effective temperatures and metallicities of late-type stars. We provide the abundances of MgH, Ti ı and Ti װ, with a list of selected lines, for the red giant of Arcturus and the metal-poor K subdwarf G 224-58 A. The Sun was used as a template star. After computing synthetic spectra for model atmospheres with different Teff and log g values, we used minimization procedures to determine the best fits to the observed features. The determination of Ti abundances was carried out in the framework of a self-consistent approach developed by Pavlenko et al. (2012). In the case of MgH we used similar minimization procedure. We present here the combination of two different approaches based on the fits performed to Ti and MgH, respectively. The resulting effective temperatures are Tₑff = 4300 K for Arcturus and Tₑff = 4600 K for G 224-58 A, where both solutions are degenerated with log g. We thank Profs. Hinkle, Kurucz, and VALD3 team for providing databases of astrophysical data used in our work and anonymous Referee for some positive remarks. en Головна астрономічна обсерваторія НАН України Advances in Astronomy and Space Physics Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines |
| spellingShingle |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines Kushniruk, I.O. Pavlenko, Ya.V. Gálvez-Ortiz, M.C. Zhang, Z.H. |
| title_short |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines |
| title_full |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines |
| title_fullStr |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines |
| title_full_unstemmed |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines |
| title_sort |
surface gravity and effective temperature of the k5 subdwarf g 224-58 a and arcturus from the fits to ti and mgh lines |
| author |
Kushniruk, I.O. Pavlenko, Ya.V. Gálvez-Ortiz, M.C. Zhang, Z.H. |
| author_facet |
Kushniruk, I.O. Pavlenko, Ya.V. Gálvez-Ortiz, M.C. Zhang, Z.H. |
| publishDate |
2016 |
| language |
English |
| container_title |
Advances in Astronomy and Space Physics |
| publisher |
Головна астрономічна обсерваторія НАН України |
| format |
Article |
| description |
We discuss here the results obtained in the determination of effective temperatures and metallicities of late-type stars. We provide the abundances of MgH, Ti ı and Ti װ, with a list of selected lines, for the red giant of Arcturus and the metal-poor K subdwarf G 224-58 A. The Sun was used as a template star. After computing synthetic spectra for model atmospheres with different Teff and log g values, we used minimization procedures to determine the best fits to the observed features. The determination of Ti abundances was carried out in the framework of a self-consistent approach developed by Pavlenko et al. (2012). In the case of MgH we used similar minimization procedure. We present here the combination of two different approaches based on the fits performed to Ti and MgH,
respectively. The resulting effective temperatures are Tₑff = 4300 K for Arcturus and Tₑff = 4600 K for G 224-58 A, where both solutions are degenerated with log g.
|
| issn |
2227-1481 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/119944 |
| citation_txt |
Surface gravity and effective temperature of the K5 subdwarf G 224-58 A and Arcturus from the fits to Ti and MgH lines / I.O. Kushniruk, Ya.V. Pavlenko, M.C. Gálvez-Ortiz, Z.H. Zhang // Advances in Astronomy and Space Physics. — 2016. — Т. 6., вип. 1. — С. 16-19. — Бібліогр.: 18 назв. — англ. |
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2025-12-07T20:49:32Z |
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