Issue |
A&A
Volume 386, Number 3, May II 2002
|
|
---|---|---|
Page(s) | 874 - 883 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20020210 | |
Published online | 15 May 2002 |
The 3 spectrum of R Doradus observed with the ISO-SWS*
1
Department of Astronomy, University of Texas, Austin, TX 78712-1083, USA
2
Uppsala Astronomical Observatory, Box 515, 751 20 Uppsala, Sweden e-mail: kjell.eriksson@astro.uu.se
Corresponding author: N. Ryde, ryde@astro.as.utexas.edu
Received:
25
September
2001
Accepted:
31
January
2002
We have modeled the 2.6– spectrum
of the red semiregular variable R Doradus observed with the
Short-Wavelength Spectrometer on board the Infrared Space
Observatory. The wavelength resolution of the observations varies
between
–2500. We have calculated a
synthetic spectrum using a hydrostatic model photosphere in
spherical geometry. The agreement between the synthetic spectrum
and the ISO observations is encouraging, especially in the
wavelength region of 2.8–
, suggesting that
a hydrostatic model photosphere is adequate for the calculation of
synthetic spectra in the near infrared for this moderately varying
red giant star. However, an additional absorption component is
needed at 2.6–
and this discrepancy is
discussed. The spectral signatures are dominated by water vapour
in the stellar photosphere, but several photospheric OH, CO, and
SiO features are also present. The effective temperature and
surface gravity derived for R Dor, based on the
2.6–
ISO spectrum and the modeling of it
with a hydrostatic model photosphere, are
and
(cgs), respectively. The spectral region
observed is found to be temperature sensitive. The effective
temperature given here is slightly higher than those reported in
the literature. We also discuss possible reasons for this.
Key words: stars: individual: R Dor / stars: AGB and post-AGB / stars: late-type / infrared: stars
© ESO, 2002
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