| Issue |
A&A
Volume 617, September 2018
|
|
|---|---|---|
| Article Number | A79 | |
| Number of page(s) | 7 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361/201832772 | |
| Published online | 18 September 2018 | |
Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon
IV. V2028 Cygni: modelling of Hα bisector variability★,★★
1
Astronomical Institute, Charles University in Prague,
V Holešovičkách 2,
180 00
Praha 8,
Czech Republic
e-mail: kor@sirrah.troja.mff.cuni.cz
2
Institute of Theoretical Physics and Astrophysics, Masaryk University,
Kotlářská 2,
611 37
Brno,
Czech Republic
3
Astronomical Institute of the Academy of Science of the Czech Republic,
Fričova 298,
251 65 Ondřejov,
Czech Republic
4
Canada-France-Hawaii Telescope Corporation,
65-1238 Mamalahoa Hwy,
Kamuela HI 96743,
USA
Received:
5
February
2018
Accepted:
4
July
2018
We present an alternative model of V2028 Cyg, a B[e] star of FS CMa type. The star V2028 Cyg is atypical among FS CMa stars due to its composite spectra of B4III and K2II-Ib type. Our modelling of the temporal variability of the Hα line bisectors indicates as the most probable model a geometrically and optically thick disc, which is surrounded by a dusty ring seen almost edge-on. This provides a possibility that the K-spectral component is formed in the disc.
Key words: stars: emission-line, Be / stars: mass-loss / accretion, accretion disks / binaries: spectroscopic / stars: individual: MWC 623
Based on observations obtained at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientique of France, and the University of Hawaii. The observations at the Canada-France-Hawaii Telescope were performed with care and respect from the summit of Maunakea, which is a significant cultural and historic site.
© ESO 2018
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