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Astron. Astrophys. 362, 289-294 (2000)

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Spectroscopy of HD 4004. Correlated profile variations? *

A. Niedzielski

Center for Astronomy, Nicholas Copernicus University, ul. Gagarina 11, 87-100 Toru, Poland (aniedzi@astri.uni.torun.pl)

Received 17 May 2000 / Accepted 17 July 2000

Abstract

We present results of detailed analysis of spectral variability observed in the optical spectrum ([FORMULA] 4350-5700 [FORMULA]) of HD 4004 (WR 1). Basing on data obtained during spectroscopic monitoring of this object in three nights in September 1994, and six nights in November 1995 we show that the variations observed in HeII lines [FORMULA] 4542, 4686, 4860 and 5411 are very similar and well correlated. We also show that the amount of variability in these lines is identical. We provide evidence, however, that the variations as observed in those HeII show also noticeable differences. The projected velocities of perturbations exposed on HeII emission line profiles do not scale with line width (FWHM). This means that the factor responsible for the observed profile variations is not coupled with the wind and its velocity law. Based on our results we argue for two-component (fast-slow) wind model of HD 4004.

Key words: stars: atmospheres – stars: mass-loss – stars: early-type – stars: individual: HD 4004 – stars: Wolf-Rayet

* Based on observations obtained with the 1.22 "Galileo" telescope of the Padova University in Asiago (Italy).

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© European Southern Observatory (ESO) 2000

Online publication: October 30, 19100
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