Large-scale variability in the profiles of Hα and Hβ in the spectrum of the Herbig B8e star MWC 419 and a model interpretation of it

Authors: Kurchakov, A.¹; Pogodin, M.²; Rspaev, F.

Source: Astrophysics, Volume 50, Number 2, April 2007 , pp. 207-224(18)

Publisher: Springer

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Abstract:

Spectroscopic data taken with a moderate resolution spectrograph in the region of the Hα and Hβ lines are presented for the Herbig B8e star MWC 419. The spectroscopic observations were accompanied by broad band BVR photometric measurements. The observations reveal a variability in the line profiles that is typical of Herbig Ae/Be stars with signs of a strong stellar wind. The greatest changes are observed in the region of the absorption components of the line profiles, which convert the profile from a type P CygII to P CygIII, as well as in the intensities of the central emission components. A model technique is used for quantitative interpretation of this variability and it shows that the P Cyg profile conversion of the absorption component can be explained in terms of a stellar wind model in which its distribution over latitude varies on a time scale of a few days.

Keywords: stars; spectra; radiative transfer — individual; MWC 419

Document Type: Research article

DOI: 10.1007/s10511-007-0021-y

Affiliations: 1: Email: anatol@aphi.kz 2: Email: pogodin@gao.spb.ru