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TYC 8606-2025-1: a mild barium star surrounded by the ejecta of a very late thermal pulseстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 19 декабря 2019 г.
- Авторы: Gvaramadze V.V., Pakhomov Yu V., Kniazev A.Y., Ryabchikova T.A., Langer N., Fossati L., Grebel E.K.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 489
- Номер: 4
- Год издания: 2019
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 5136
- Последняя страница: 5145
- DOI: 10.1093/mnras/stz2484
- Аннотация: We report the discovery of a spiral-like nebula with the Wide-field Infrared Survey Explorer (WISE) and the results of optical spectroscopy of its associated star TYC 8606-2025-1 with the Southern African Large Telescope (SALT). We find that TYC 8606-2025-1 is a G8 III star of \approx3 Msun, showing a carbon depletion by a factor of two and a nitrogen enhancement by a factor of three. We also derived an excess of s-process elements, most strongly for barium, which is a factor of three overabundant, indicating that TYC 8606-2025-1 is a mild barium star. We thereby add a new member to the small group of barium stars with circumstellar nebulae. Our radial velocity measurements indicate that TYC 8606-2025-1 has an unseen binary companion. The advanced evolutionary stage of TYC 8606-2025-1, together with the presence of a circumstellar nebula, implies an initial mass of the companion of also about 3 Msun. We conclude that the infrared nebula, due to its spiral shape, and because it has no optical counterpart, was ejected by the companion as a consequence of a very late thermal pulse, during about one orbital rotation.
- Добавил в систему: Гварамадзе Василий Васильевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | MNRAS_33TYC_8606-2025-1.pdf | 4,0 МБ | 28 сентября 2019 [Gvaramadze] |