Doppler Tomography of the Be Star HD 698
Gabitova I.A. Zharikov S.V. Miroshnichenko A.S. Carciofi A. Khokhlov A.A. Agishev A. Prendergast P.
August 2025Multidisciplinary Digital Publishing Institute (MDPI)
Galaxies
2025#13Issue 4
We present a Doppler tomography study of the Be star HD 698, recently resolved via interferometry as a post-mass-transfer binary system consisting of a Be star and a stripped, pre-subdwarf companion. Based on 76 high-resolution optical spectra obtained between 2014 and 2023, we analyze the H (Formula presented.) and H (Formula presented.) emission lines and apply Doppler tomography to map the structure of the circumstellar disk. The H (Formula presented.) line reveals an asymmetric, multi-component velocity distribution, with an emission feature closely following the orbital motion of the companion. V/R variations in both H (Formula presented.) and H (Formula presented.) lines are phase-locked with the companion’s orbital motion, indicating a tidally induced disk asymmetry. We discuss possible origins of the companion-centered H (Formula presented.) emission, including a circumsecondary disk, a transient mass-transfer stream, and stellar wind.
Be stars , binary stars , circumstellar matter , Doppler tomography , spectroscopy
Text of the article Перейти на текст статьи
Faculty of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave., 71, Almaty, 050040, Kazakhstan
Instituto de Astronomía, Universidad Nacional Autónoma de México, AP 106, Baja California, Ensenada, 22800, Mexico
Department of Physics and Astronomy, University of North Carolina–Greensboro, Greensboro, 27402, NC, United States
Fesenkov Astrophysical Institute, Observatory, 23, Almaty, 050020, Kazakhstan
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, SP, São Paulo, 05508-900, Brazil
Kernersville Observatory, Winston-Salem, 27285, NC, United States
Faculty of Physics and Technology
Instituto de Astronomía
Department of Physics and Astronomy
Fesenkov Astrophysical Institute
Instituto de Astronomia
Kernersville Observatory
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026