The optical spectrum of HD 4004 (WN 4b). Evidence of variability

Authors
Niedzielski, A
Citation
A. Niedzielski, The optical spectrum of HD 4004 (WN 4b). Evidence of variability, ACT ASTRONO, 48(4), 1998, pp. 729-746
Citations number
36
Categorie Soggetti
Space Sciences
Journal title
ACTA ASTRONOMICA
ISSN journal
00015237 → ACNP
Volume
48
Issue
4
Year of publication
1998
Pages
729 - 746
Database
ISI
SICI code
0001-5237(1998)48:4<729:TOSOH4>2.0.ZU;2-P
Abstract
We describe the optical spectrum of Wolf-Rayet star HD 4004 (WN 4b) in the wavelength range from 3900 to 7000 Angstrom. Present observations reveal th e stratification effects in the envelope of this star. Also evidence for va riability of HeII line lambda 5411 is presented. Since no radial velocity v ariations are observed in the optical spectrum of this star we conclude tha t HD 4004 is a single Wolf-Rayet star and the observed emission line profil e changes are of intrinsic nature.