A study on the nature of the peculiar supergiant HD101584

Details A study on the nature of the peculiar supergiant HD101584 A study on the nature of the peculiar supergiant HD101584

1995-09-21

arxiv.org/abs/astro-ph/9509111v3

Astronomy and Astrophysics

Astrophysics

Accepted by A&A main journal, 24 pages plain text with 11 postscript figures, uses psfig.sty

Scientific paper

We present a study of low- and high-resolution ultraviolet, high-resolution optical CAT/CES spectra and ultraviolet, optical and infrared photometry of the peculiar supergiant HD101584. From the photometry we learn that the ultraviolet and optical energy distribution cannot be fitted in a consistent way and we need a model in which the UV and optical energy distribution are formed by different gas. The Geneva photometry is best fitted to a B9II Kurucz model, Teff=12000+-1000K and log g=3.0 +-1.0, with an extinction of E(B-V)=0.49+-0.05. The observed spectral features in the spectrum of HD101584 are classified in eight different categories based on the velocity, shape of profile and the identification. The high-excitation HeI(chi=20.87eV), NII(chi=18.40eV), CII (chi=14.39eV) and NI (chi=10.29eV) optical absorption lines are formed in the photosphere of a late B-star (e.g. B8-9I-II). These absorption lines show radial velocity variations which are attributed to binary motion, with the secondary being a

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