Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...387..151m&link_type=abstract
Astronomy and Astrophysics, v.387, p.151-161 (2002)
Astronomy and Astrophysics
Astrophysics
13
Stars: Emission-Line, Be, Stars: Variables: General, Stars: Individual: Hr Car
Scientific paper
We present new high-resolution observations of the LBV (or S Dor variable) HR Carinae, taken with the FEROS spectrograph in the wavelength range lambda 3900-8200. The H I and Fe II lines show P Cygni profiles while the He I lines are all in absorption. Emission lines due to [N II], [O I], Na II, Mg II, Ca II and [Fe II] were also identified. Complex structures in the absorption profiles of Hα , Hβ and in most of the iron lines suggest the presence of two distinct absorption regions with expansion velocities of 30 km s-1 and 100 km s-1. From a spectral analysis of the Balmer lines with a non-LTE expanding atmosphere code, we derive for HR Carinae the following parameters: Tstar =10 000 K, Rstar = 350 Rsun, dot M=6.8 x 10-5 Msun yr-1 and He/H = 0.4. The comparison of the temperature obtained in this work with the values estimated by Nota et al. (\cite{Note97}) indicates that HR Carinae is moving redward across the H-R diagram on a short timescale, due to a new S Dor-phase. Based on observations made with the 1.52 m telescope at the European Southern Observatory (La Silla, Chile) under the agreement with the Observatório Nacional, Brazil. Tables 1 and 2 are only available in electronic form at http://www.edpsciences.org
de Araújo Francisco Xavier
Fernandes Marcelo Borges
Machado M. A. D.
Pereira Claudio Bastos
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