Issue |
A&A
Volume 465, Number 3, April III 2007
|
|
---|---|---|
Page(s) | 993 - 1002 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20066401 | |
Published online | 22 January 2007 |
Spectral atlas of massive stars around
10 830 Å *,**,***
1
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brasil e-mail: groh@astro.iag.usp.br
2
Instituto Nacional de Pesquisas Espaciais/MCT, Avenida dos Astronautas 1758, 12227-010 São José dos Campos, SP, Brasil
Received:
14
September
2006
Accepted:
8
November
2006
We present a digital atlas of peculiar, high-luminosity massive stars in the
near-infrared region (10 470-11 000 Å) at medium resolution (). The spectra
are centered around
10 830 Å, which is formed in the wind of those stars, and is
a crucial line to obtain their physical parameters. The instrumental configuration also
sampled a rich variety of emission lines of
,
,
,
, and Pa γ. Secure identifications for most spectral lines are given,
based on synthetic atmosphere models calculated by our group. We also propose that two
unidentified absorption features have interstellar and/or circumstellar origin.
For the strongest one (10 780 Å) an empirical calibration between
and equivalent
width is provided. The atlas displays the spectra of massive stars organized in four
categories, namely Be stars, OBA Iape (or luminous blue variables, LBV candidates and
ex/dormant LBVs), OB supergiants and Wolf-Rayet stars. For comparison, the photospheric
spectra of non emission-line stars are presented. Selected LBVs were observed in different
epochs from 2001 to 2004, and their spectral variability reveals that some stars, such as
η Car, AG Car and HR Car, suffered dramatic spectroscopic changes during this time
interval.
Key words: atlases / stars: emission-line, Be / stars: Wolf-Rayet / stars: winds, outflows / stars: early-type
© ESO, 2007
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