Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations
In 2011 a promising candidate for an RR Lyrae star in an eclipsing binary system was found. Till that time not even one case of RR Lyrae star in a binary system has been known. The pulsator's mass is 0.26 Mꙩ which is not enough to burn helium in the core, as RR Lyrae stars do. The presence of...
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| Опубліковано в: : | Advances in Astronomy and Space Physics |
|---|---|
| Дата: | 2012 |
| Автор: | |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Головна астрономічна обсерваторія НАН України
2012
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/119184 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations / P. Karczmarek // Advances in Astronomy and Space Physics. — 2012. — Т. 2., вип. 2. — С. 135-138. — Бібліогр.: 10 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862730258962186240 |
|---|---|
| author | Karczmarek, P. |
| author_facet | Karczmarek, P. |
| citation_txt | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations / P. Karczmarek // Advances in Astronomy and Space Physics. — 2012. — Т. 2., вип. 2. — С. 135-138. — Бібліогр.: 10 назв. — англ. |
| collection | DSpace DC |
| container_title | Advances in Astronomy and Space Physics |
| description | In 2011 a promising candidate for an RR Lyrae star in an eclipsing binary system was found. Till that time not even one case of RR Lyrae star in a binary system has been known. The pulsator's mass is 0.26 Mꙩ which is not enough to burn helium in the core, as RR Lyrae stars do. The presence of a more massive companion is a clue that the mass transfer had to occur in the past. Therefore, Binary Evolution Pulsating (BEP) star, while having RR Lyr-like light curve, has completely unlike internal structure. The bulk of the star's mass was lost during the red giant phase due to mass transfer and the partially degenerated helium core with thin hydrogen burning shell was revealed. The BEP object has been captured inside the instability strip (IS) in the RR Lyrae area and thus it is confused with classical RR Lyrae pulsators. Therefore, the BEP star is the evidence of a new evolutionary channel to produce RR Lyr-like oscillations. In simulations made with StarTrack code we trace the evolution of a sample of binaries and examine properties of the system required for pulsation phase to occur. We suggest that the stars created via this new evolutionary channel can in part explain the existence of UV up-turn, low-mass C-O WD and He WD.
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| first_indexed | 2025-12-07T19:19:32Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-119184 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 2227-1481 |
| language | English |
| last_indexed | 2025-12-07T19:19:32Z |
| publishDate | 2012 |
| publisher | Головна астрономічна обсерваторія НАН України |
| record_format | dspace |
| spelling | Karczmarek, P. 2017-06-04T18:59:19Z 2017-06-04T18:59:19Z 2012 Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations / P. Karczmarek // Advances in Astronomy and Space Physics. — 2012. — Т. 2., вип. 2. — С. 135-138. — Бібліогр.: 10 назв. — англ. 2227-1481 https://nasplib.isofts.kiev.ua/handle/123456789/119184 In 2011 a promising candidate for an RR Lyrae star in an eclipsing binary system was found. Till that time not even one case of RR Lyrae star in a binary system has been known. The pulsator's mass is 0.26 Mꙩ which is not enough to burn helium in the core, as RR Lyrae stars do. The presence of a more massive companion is a clue that the mass transfer had to occur in the past. Therefore, Binary Evolution Pulsating (BEP) star, while having RR Lyr-like light curve, has completely unlike internal structure. The bulk of the star's mass was lost during the red giant phase due to mass transfer and the partially degenerated helium core with thin hydrogen burning shell was revealed. The BEP object has been captured inside the instability strip (IS) in the RR Lyrae area and thus it is confused with classical RR Lyrae pulsators. Therefore, the BEP star is the evidence of a new evolutionary channel to produce RR Lyr-like oscillations. In simulations made with StarTrack code we trace the evolution of a sample of binaries and examine properties of the system required for pulsation phase to occur. We suggest that the stars created via this new evolutionary channel can in part explain the existence of UV up-turn, low-mass C-O WD and He WD. It is a pleasure to thank G. Pietrzynski for supporting this project. I am grateful to K. Belczynski for sharing the StarTrack code and for many useful and valuable instructions. The research presented here was supported by the TEAM subsidies of the Foundation for Polish Science (FNP). en Головна астрономічна обсерваторія НАН України Advances in Astronomy and Space Physics Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations Article published earlier |
| spellingShingle | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations Karczmarek, P. |
| title | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations |
| title_full | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations |
| title_fullStr | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations |
| title_full_unstemmed | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations |
| title_short | Binary evolution pulsating star - new evolutionary channel to produce RR Lyr-like pulsations |
| title_sort | binary evolution pulsating star - new evolutionary channel to produce rr lyr-like pulsations |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/119184 |
| work_keys_str_mv | AT karczmarekp binaryevolutionpulsatingstarnewevolutionarychanneltoproducerrlyrlikepulsations |