Using spectroscopic analysis of unclassified supergiants to investigate massive stars in transition. II. The superluminous HD 327083

Details Using spectroscopic analysis of unclassified supergiants to investigate massive stars in transition. II. The superluminous HD 327083 Using spectroscopic analysis of unclassified supergiants to investigate massive stars in transition. II. The superluminous HD 327083

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..665m&link_type=abstract

Astronomy and Astrophysics, v.409, p.665-675 (2003)

Astronomy and Astrophysics

Astrophysics

4

Stars: Emission-Line, Be, Stars: Variables: General, Stars: Individual: Hd 327083

Scientific paper

New optical high-resolution (R~50 000) 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 Hdelta ) with a non-LTE wind model has been performed. The derived stellar parameters for HD 327083 are: log (Lstar/Lsun) = 6.0, Tstar = 11 500 K, dot M = 8.0 x 10-5 Msun/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 MZAMS ~ 60 Msun. It is likely to be about to enter in a Luminous Blue Variable 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.

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