First high-resolution optical spectra of the distant emission-line star VES 723 (IRAS 02110+6212)
Miroshnichenko A.S. Klochkova V.G. Chentsov E.L. Panchuk V.E. Yushkin M.V. Manset N.
1 October 2021Oxford University Press
Monthly Notices of the Royal Astronomical Society
2021#507Issue 1879 - 885 pp.
The first high-resolution spectra (resolving powers of R ≥ 60 000) of the emission-line star VES 723, which has an unknown evolutionary status, were taken at the 6-m Big Telescope Alt-Azimuthal and the 3.6-m Canada-France-Hawaii Telescope. The spectrum is dominated with powerful emission lines of neutral hydrogen and helium, and forbidden singly ionized nitrogen. The Hα and He i lines were found to exhibit broad foundations of the emission profiles at least 250 km s-1 wide. The strongest emission lines exhibit no noticeable variations during the observing period (2011-2017) except for the He i lines. The spectra contain multicomponent interstellar absorptions of Na i and K i (mult. 1) and several strongest diffuse interstellar bands, while photospheric absorptions have not been detected. The average radial velocity of the forbidden [N ii] emission line centres was adopted as the systemic velocity (Vsys ≈ -52 km s-1), which indicates a large distance of ≈6 kpc. Our luminosity estimates of log L/L⊙ = 3.7-4.0 for two different Gaia distance measurements, along with an effective temperature of Teff = 25 000 ± 2000 K and a fast decrease of the infrared flux longward of λ ∼ 10, μm, allow us to suggest that VES 723 is neither a pre-main-sequence Herbig B[e] star nor a B[e] supergiant but rather a member of the FS CMa group of objects with the B[e] phenomenon.
stars: emission-line, Be , stars: individual: VES 723 (IRAS 02110+6212)
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Department of Physics and Astronomy, University of North Carolina at Greensboro, PO Box 26170, Greensboro, 27402-6170, NC, United States
Main Astronomical Observatory of the Russian Academy of Sciences, Saint-Petersburg, Russian Federation
Fesenkov Astrophysical Institute, Observatory 23, Almaty, 050023, Kazakhstan
Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnyj Arkhyz, Russian Federation
CFHT Corporation, 65-1238 Mamalahoa Hwy, Kamuela, 96743, HI, United States
Department of Physics and Astronomy
Main Astronomical Observatory of the Russian Academy of Sciences
Fesenkov Astrophysical Institute
Special Astrophysical Observatory of the Russian Academy of Sciences
CFHT Corporation
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