Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44
|
|
| Автор |
Joshi, S.
Trust, O. Semenko, E. Williams, P. E. Lampens, P. De, Cat, P. Vermeylen, L. Holdsworth, D. L. García, R. A. Mathur, S. Santos, A. R. G. Mkrtichian, D. Goswami, A. Cuntz, M. Yadav, A. P. Sarkar, M. Bhatt, B. C. Aliçavuş, F. K. Nhlapo, M. D. Lund, M. N. Goswami, P. P. Savanov, I. Jorissen, A. Jurua, E. Avvakumova, E. Dmitrienko, E. S. Chakradhari, N. K. Das, M. K. Chowdhury, S. Abedigamba, O. P. Yakunin, I. Letarte, B. Karinkuzhi, D. |
|
| Тематика |
POLARIMETRIC
SPECTROSCOPIC STARS: ACTIVITY STARS: BINARIES STARS: CHEMICALLY PECULIAR TECHNIQUES: PHOTOMETRIC MAGNETIC FIELDS SPECTROSCOPIC ANALYSIS STARS BE STARS CHEMICALLY PECULIAR-STARS HIGH-RESOLUTION SPECTROSCOPY MAGNETIC-FIELD SPECTROSCOPIC STAR: ACTIVITY STARS: BE STARS: BINARIES STARS: CHEMICALLY PECULIAR TECHNIQUES: PHOTOMETRIC PHOTOMETRY |
|
| Описание |
We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high-precision photometric K2 data reveals that the light variations in HD 73045 and HD 76310 are rotational in nature and caused by spots or cloud-like co-rotating structures, which are non-stationary and short-lived. The time-resolved radial velocity measurements, in combination with the K2 photometry, confirm that HD 73045 does not show any periodic variability on time-scales shorter than 1.3 d, contrary to previous reports in the literature. In addition to these new rotational variables, we discovered a new heartbeat system, HD 73619, where no pulsational signatures are seen. The spectroscopic and spectropolarimetric analyses indicate that HD 73619 belongs to the peculiar Am class, with either a weak or no magnetic field, considering the 200-G detection limit of our study. The least-squares deconvolution profiles for HD 76310 indicate a complex structure in its spectra, suggesting that this star is either part of a binary system or surrounded by a cloud shell. When placed in the Hertzsprung-Russell diagram, all studied stars are evolved from the main sequence and situated in the δScuti instability strip. This work is relevant for further detailed studies of chemically peculiar stars, for example on inhomogeneities (including spots) in the absence of magnetic fields and the origin of the pulsational variability in heartbeat systems. © 2022 The Author(s).
|
|
| Дата |
2024-04-08T11:06:43Z
2024-04-08T11:06:43Z 2022 |
|
| Тип |
Article
Journal article (info:eu-repo/semantics/article) Published version (info:eu-repo/semantics/publishedVersion) |
|
| Идентификатор |
Joshi, S, Trust, O, Semenko, E, Williams, PE, Lampens, P, De Cat, P, Vermeylen, L, Holdsworth, DL, García, RA, Mathur, S, Santos, ARG, Mkrtichian, D, Goswami, A, Cuntz, M, Yadav, AP, Sarkar, M, Bhatt, BC, Aliçavuş, FK, Nhlapo, MD, Lund, MN, Goswami, PP, Savanov, I, Jorissen, A, Jurua, E, Avvakumova, E, Dmitrienko, ES, Chakradhari, NK, Das, MK, Chowdhury, S, Abedigamba, OP, Yakunin, I, Letarte, B & Karinkuzhi, D 2022, 'Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44', Monthly Notices of the Royal Astronomical Society, Том. 510, № 4, стр. 5854-5871. https://doi.org/10.1093/mnras/stab3158
Joshi, S., Trust, O., Semenko, E., Williams, P. E., Lampens, P., De Cat, P., Vermeylen, L., Holdsworth, D. L., García, R. A., Mathur, S., Santos, A. R. G., Mkrtichian, D., Goswami, A., Cuntz, M., Yadav, A. P., Sarkar, M., Bhatt, B. C., Aliçavuş, F. K., Nhlapo, M. D., ... Karinkuzhi, D. (2022). Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44. Monthly Notices of the Royal Astronomical Society, 510(4), 5854-5871. https://doi.org/10.1093/mnras/stab3158 0035-8711 Final All Open Access; Green Open Access https://arxiv.org/pdf/2110.14275.pdf https://arxiv.org/pdf/2110.14275.pdf http://elar.urfu.ru/handle/10995/131341 10.1093/mnras/stab3158 85125121841 000764893600001 |
|
| Язык |
en
|
|
| Права |
Open access (info:eu-repo/semantics/openAccess)
|
|
| Формат |
application/pdf
|
|
| Издатель |
Oxford University Press
|
|
| Источник |
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society |
|