Doppler Tomography of the Be Star HD 698
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 Hα and Hβ emission lines and apply Doppler tomography to map the structure of the circumstellar disk. The Hα 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 Hα and Hβ lines are phase-locked with the companion’s orbital motion, indicating a tidally induced disk asymmetry. We discuss possible origins of the companion-centered Hα emission, including a circumsecondary disk, a transient mass-transfer stream, and stellar wind.
Authors
- A. C. Carciofi (ORCID: https://orcid.org/0000-0002-9369-574X)
- S. V. Zharikov (ORCID: https://orcid.org/0000-0003-2526-2683)
- А. С. Мирошниченко (ORCID: https://orcid.org/0000-0002-3833-1038)
- Azamat A. Khokhlov (ORCID: https://orcid.org/0000-0001-6987-9058)
- Aldiyar T. Agishev (ORCID: https://orcid.org/0000-0001-9788-7485)
- Peter Prendergast
- Ilfa A. Gabitova (ORCID: https://orcid.org/0000-0002-5328-8568)
Institutions
- University of North Carolina at Greensboro (US)
- Universidad Autónoma de Baja California (MX)
- Al-Farabi Kazakh National University (KZ)
- Fesenkov Astrophysical Institute (KZ)
- Instituto de Geofísica y Astronomía (CU)
- Universidad Nacional Autónoma de México (MX)
Publication Details
- Journal
- Galaxies
- Published
- 2025-07-16
- DOI
- https://doi.org/10.3390/galaxies13040080
- Citations
- 1
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 1.15
Funders
- National Aeronautics and Space Administration
- Ministry of Education and Science of the Republic of Kazakhstan
- Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México