| Issue |
A&A
Volume 409, Number 2, October II 2003
|
|
|---|---|---|
| Page(s) | 665 - 675 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20031159 | |
| Published online | 17 November 2003 | |
Using spectroscopic analysis of unclassified supergiants to investigate massive stars in transition*
II. The superluminous HD 327083
Observatório Nacional-MCT, Rua José Cristino, 77, CEP 20921-400, São Cristóvão, Rio de Janeiro-RJ, Brazil
Corresponding author: M. A. D. Machado, dora@on.br
Received:
16
January
2003
Accepted:
7
July
2003
New optical high-resolution (
) spectra of the star
HD 327083 are reported in this paper. The Balmer and Fe ii
lines show P Cygni profiles while He i lines are all in pure
absorption, resembling the spectra of the Luminous Blue Variable HR
Carinae. However, the blue absorption components of the Balmer lines
are more pronounced and the Fe ii lines are less numerous and
less intense in HD 327083.
A spectroscopic analysis of the
Balmer lines (Hα, Hβ, Hγ and Hδ) with a
non-LTE wind model has been performed.
The derived stellar parameters for HD 327083
are: 
, 
= 11 500 K, 
/yr and He/H = 0.2 (by number). From
these results we
concluded that HD 327083 is a superluminous object in an evolved phase
of an evolutive track of 
60 
.
It is likely to be about to enter in a Luminous Blue Variable phase.
Key words: stars: emission-line, Be / stars: variables: general / stars: individual: HD 327083
© ESO, 2003
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