SPECTRAL ANALYSIS OF THE STAR MWC 645
MWC645 ЖҰЛДЫЗЫНЫҢ СПЕКТРЛІК ТАЛДАУЫ
СПЕКТРАЛЬНЫЙ АНАЛИЗ ЗВЕЗДЫ MWC 645
Nodyarov A.S. Rassylova A.E. Omar A.Zh.
2025Kazakh-British Technical University
Herald of the Kazakh British Technical UNiversity
2025#22Issue 4340 - 353 pp.
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.
Be stars , binary stars , Emission line stars , spectroscopic binary stars , stars
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Al-Farabi Kazakh National University, Almaty, Kazakhstan
Kazakh National Women’s Pedagogical University, Almaty, Kazakhstan
Al-Farabi Kazakh National University
Kazakh National Women’s Pedagogical University
10 лет помогаем публиковать статьи Международный издатель
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