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SPECTRAL ANALYSIS OF THE STAR MWC 645

Автор(ы)
A. S. Nodyarov
Aruzhan Omar
Дата публикации
23 декабря 2025 г.
Тип
journal article
Журнал
Том
22
Выпуск
4
Первая страница
340
Последняя страница
353
DOI
ISSN
1998-6688
Аннотация
This study presents results of high-resolution spectroscopic observations of the star MWC 645, a representative of the poorly studied FS CMa-type objects. These stars are characterized by strong emission lines and significant infrared excess caused by circumstellar dust. For the first time, a cool secondary component has been detected in this system. Fundamental parameters were determined for both components: for the hot (B-type) star, an effective temperature of 18,000 ± 2000 K and luminosity log(L/L☉ ) = 3.9 ± 0.4; and for the cool (K-type) star, Teff = 4250 ± 250 K and log(L/L☉ ) = 3.1 ± 0.4. The system is located at a distance of 6.5 ± 0.9 kpc and shows clear signs of active interaction, including ongoing mass transfer indicated by the complex profiles of many emission lines. The results confirm the binary nature of MWC 645 and its classification as an FS CMa-type object. This work highlights the need for further observations to refine the system’s parameters and improve our understanding of the structure and origin of its circumstellar environment.
Темы

symbiotic stars

binary stars

circumstellar dust

infrared excess

emission lines

mass transfer

effective temperature...

luminosity

circumstellar environ...

Области науки (FoS)

Physics and Astronomy...

Astronomy and Astroph...

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W7117157134.pdf

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Полный текст в открытом доступе, лицензия cc-by; источник: https://vestnik.kbtu.edu.kz/jour/article/download/2305/687
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734,71 KB

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