On the Spectrum of Extremely Metal-Poor Star HD 52961
High resolution spectra of the extremely metal-poor star HD 52961 are investigated. The atmospheric parameters found are: Teff = 6000 ± 100 K, log g = 0.5±0.5, ξt = 6.8 km s−1, [Fe/H] = −4.50±0.20. The carbon abundance is close to the solar one, [C/H] = −0.17±0.12. At the same time abundances of hea...
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De Gruyter
2013-06-01
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| Series: | Open Astronomy |
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| Online Access: | https://doi.org/10.1515/astro-2017-0150 |
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doaj-110f375a383740629d6b55340a5e721b2021-09-06T19:40:11ZengDe GruyterOpen Astronomy2543-63762013-06-0122210111010.1515/astro-2017-0150astro-2017-0150On the Spectrum of Extremely Metal-Poor Star HD 52961Kipper Tõnu0Tartu Observatory, Tõravere, 61602, EstoniaHigh resolution spectra of the extremely metal-poor star HD 52961 are investigated. The atmospheric parameters found are: Teff = 6000 ± 100 K, log g = 0.5±0.5, ξt = 6.8 km s−1, [Fe/H] = −4.50±0.20. The carbon abundance is close to the solar one, [C/H] = −0.17±0.12. At the same time abundances of heavy refractory elements are very low. The chemical composition and atmospheric parameters have not changed compared to the first observations of the star about 20 years ago, contrary to expectation of dissolving the peculiarities by mass-loss during a relatively short time. We also find evidence of ongoing mass-loss in this post-AGB star with a rate of Ṁ ≈ 5 · 10−6M⊙ yr−1.https://doi.org/10.1515/astro-2017-0150stars: atmospheresstars: individual: hd52961 |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Kipper Tõnu |
| spellingShingle |
Kipper Tõnu On the Spectrum of Extremely Metal-Poor Star HD 52961 Open Astronomy stars: atmospheres stars: individual: hd52961 |
| author_facet |
Kipper Tõnu |
| author_sort |
Kipper Tõnu |
| title |
On the Spectrum of Extremely Metal-Poor Star HD 52961 |
| title_short |
On the Spectrum of Extremely Metal-Poor Star HD 52961 |
| title_full |
On the Spectrum of Extremely Metal-Poor Star HD 52961 |
| title_fullStr |
On the Spectrum of Extremely Metal-Poor Star HD 52961 |
| title_full_unstemmed |
On the Spectrum of Extremely Metal-Poor Star HD 52961 |
| title_sort |
on the spectrum of extremely metal-poor star hd 52961 |
| publisher |
De Gruyter |
| series |
Open Astronomy |
| issn |
2543-6376 |
| publishDate |
2013-06-01 |
| description |
High resolution spectra of the extremely metal-poor star HD 52961 are investigated. The atmospheric parameters found are: Teff = 6000 ± 100 K, log g = 0.5±0.5, ξt = 6.8 km s−1, [Fe/H] = −4.50±0.20. The carbon abundance is close to the solar one, [C/H] = −0.17±0.12. At the same time abundances of heavy refractory elements are very low. The chemical composition and atmospheric parameters have not changed compared to the first observations of the star about 20 years ago, contrary to expectation of dissolving the peculiarities by mass-loss during a relatively short time. We also find evidence of ongoing mass-loss in this post-AGB star with a rate of Ṁ ≈ 5 · 10−6M⊙ yr−1. |
| topic |
stars: atmospheres stars: individual: hd52961 |
| url |
https://doi.org/10.1515/astro-2017-0150 |
| work_keys_str_mv |
AT kippertonu onthespectrumofextremelymetalpoorstarhd52961 |
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