Towards Understanding The B[e] Phenomenon: VI. Nature and Spectral Variations of HD 85567

Abstract

We report the results of high-resolution ($R\sim 80,000$) spectroscopic observations of the emission-line object HD 85567, which has been classified as a FS CMa type object or a pre-main-sequence star. The main goal is to put more constraints on the object's fundamental parameters as well as on its nature and evolutionary state. Absorption lines in the spectrum of HD 85567 were found similar to those of mid B--type dwarfs and correspond to the following fundamental parameters: T${}_{\mathrm{eff}}=15000\pm 500$ K, $v\sin i=31\pm 3$ km s${}^{-1}$, $\log g\sim 4.0$. The interstellar extinction, A${}_V$ $=0.50\pm 0.02$ mag, was measured using the strengths of some diffuse interstellar bands. We also obtained $UBV(RI{)}_{\mathrm{c}}$ images of a $10^{\prime }\times 10^{\prime }$ region around the object. Photometry of projectionally close stars was used to derive an interstellar extinction law in this direction and resulted in a distance of 1300$\pm$100 pc to the object and a luminosity of $\log$ (L/L${}_{\odot })=3.3\pm 0.2$. We found no significant radial velocity variations of the absorption lines in the spectra of HD 85567 obtained during two month-long periods of time in 2012 and 2015. Our analysis of the spectroscopic and photometric data available for the star led us to a conclusion that it cannot be a pre-main-sequence Herbig Ae/Be star. We argue that the circumstellar gas and dust were produced during the object's evolution as most likely a binary system, which contains an undetected secondary component and is unlikely to be a merger product.

12 pages, 13 figures, 8 tables, accepted for publication in ApJ

References in corpus (7)

• The Impact of Dust Evolution and Photoevaporation on Disk Dispersal
• Evolution of emission line activity in intermediate mass young stars
• Investigating the inner discs of Herbig Ae/Be stars with CO bandhead and Br Gamma emission
• Spin-up and hot spots can drive mass out of a binary
• Non-conservative evolution in Algols: where is the matter?
• Molecular hydrogen in the circumstellar environments of Herbig Ae/Be stars probed by FUSE
• Study of the sub-AU disk of the Herbig B[e] star HD 85567 with near-infrared interferometry

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• First detection of a magnetic field in low-luminosity B[e] stars: New scenarios for the nature and evolutionary stages of FS CMa stars
• BCD spectrophotometry for massive stars in transition phases