kaz29Вестник Казахстанско-Британского технического университетаHerald of the Kazakh-British Technical University1998-66882959-8109Казахстанско-Британский Технический Университет10.55452/1998-6688-2025-22-4-340-353kaz29-2305Research ArticleФИЗИЧЕСКИЕ НАУКИPHYSICAL SCIENCESСПЕКТРАЛЬНЫЙ АНАЛИЗ ЗВЕЗДЫ MWC 645SPECTRAL ANALYSIS OF THE STAR MWC 645https://orcid.org/0000-0002-0045-5457НодяровА. С.NodyarovA. S.

PhD

г. Алматы

PhD

Almaty

nodyarov.atilkhan@gmail.comhttps://orcid.org/0000-0001-6964-8444РасыловаА. Е.RassylovaA. E.

PhD

г. Алматы

PhD

Almaty

rassylova.ainash@gmail.comhttps://orcid.org/0000-0002-5604-3742ОмарА. Ж.OmarA. Zh.

PhD

г. Алматы

PhD

Almaty

omaruzhan@gmail.comКазахский национальный университет им. аль-ФарабиКазахстанAl-Farabi Kazakh National UniversityKazakhstanКазахский национальный женский педагогический университетКазахстанKazakh National Women’s Pedagogical UniversityKazakhstan202523122025224340353Copyright © Нодяров А.С., Расылова А.Е., Омар А.Ж., 20252025Нодяров А.С., Расылова А.Е., Омар А.Ж.Nodyarov A.S., Rassylova A.E., Omar A.Z.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestnik.kbtu.edu.kz/jour/article/view/2305

В данной работе представлены результаты спектроскопических наблюдений звезды MWC 645 – представителя слабоизученного класса объектов типа FS CMa, характеризующегося наличием сильных эмиссионных линий и инфракрасного избытка, связанного с околозвездной пылью. На основе наблюдений высокого спектрального разрешения впервые обнаружен холодный вторичный компонент в системе. Определены фундаментальные параметры обоих компонентов: для горячей (B-типа) звезды – эффективная температура 18,000 ± 2000 K и светимость log(L/L ) = 3.9 ± 0.4, для холодной (K-типа) – 4250 ± 250 K и log(L/L☉           ☉  ) = 3.1 ±  0.4. Система находится на расстоянии 6.5 ± 0.9 кпк и демонстрирует признаки активного взаимодействия, включая текущий перенос массы, о чем свидетельствуют сложные профили эмиссионных линий. Полученные результаты подтверждают двойственную природу MWC 645 и ее принадлежность к типу FS CMa. Работа подчеркивает необходимость дальнейших наблюдений для уточнения параметров системы и лучшего понимания процессов в околозвездной оболочке.

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.

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The authors declare that there are no conflicts of interest present.