Issue |
A&A
Volume 448, Number 1, March II 2006
|
|
---|---|---|
Page(s) | 351 - 366 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20053066 | |
Published online | 17 February 2006 |
Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula
Rotational velocities, stellar parameters, and oxygen abundances
1
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain e-mail: ssimon@iac.es
2
Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de la Palma, Tenerife, Spain
3
Departamento de Astrofísica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, s/n, 38071 La Laguna, Spain
4
Instituto de Estructura de la Materia, CSIC, C/ Serrano 121, 28006 Madrid, Spain
Received:
15
March
2005
Accepted:
1
October
2005
We present the results of a spectroscopic analysis of the
Trapezium cluster stars inside the Orion nebula. The rotational velocities
were obtained using the Fourier analysis method, and we found agreement with
values derived by the usual method based on linewidth measurements.
The rotational velocity derived for Ori C by this method
is consistent with the variability of some of its spectral features that
have a period of 15.42 days.
By means of the fit of
,
, and
observed
profiles with Fastwind synthetic profiles, stellar parameters and wind
characteristics were derived. This methodology let us estimate the
errors associated with these parameters, and we found that macroturbulence
effects have to be included for a good
fit to the
lines in the spectrum of
Ori C.
By means of a very accurate study, oxygen abundances were derived
for the three B0.5V stars
Ori A, D, and
Ori B. Final abundances are consistent with the nebular gas-phase results presented in Esteban et al. (2004) and are lower than
those given by Cunha & Lambert (1994). Our results suggest
a lower dust depletion factor of oxygen than previous estimations for the
Orion nebula.
Key words: stars: abundances / stars: early-type / stars: fundamental parameters / ISM: abundances / ISM: H ii regions / ISM: individual objects: Orion nebula
© ESO, 2006
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