A&A Supplement series, Vol. 128, March II 1998, 475-483

Received June 5; accepted August 1, 1997

B[e] stars

V. HD 50138 = MWC 158

C. Jaschek and Y. Andrillat

Send offprint request: Y. Andrillat

  Observatoire de Strasbourg, URA 1280, CNRS 11, rue de l'Université, 67000 Strasbourg, France
  Laboratoire d'Astronomie Université de Montpellier 2, URA 1280 CNRS, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France

Abstract:

On the basis of spectroscopic CCD material obtained at the Haute Provence Observatory, we provide line identifications and equivalent width measurements in the wavelength region 3738-10232 A of the spectrum of HD 50138 Over two hundred features are identified and a comparison of our results with those of other authors is provided. We also discuss the variability of the lines using equivalent widths and descriptions of the line spectrum. We attribute as a best compromise a spectral type of B 5 III. We conclude that the gaseous shell surrounding the star has a temperature of the order of 10 000 K and that its distance to the star is of the order of two stellar radii. We discuss the relation of this star to others previously analyzed and warn against hasty generalizations.

keywords: stars: emission line, B[e] -- stars peculiar stars: HD 50138

• 1. Introduction
• 2. Material
• 3. Line identifications
• 4. The behavior of the elements
• 5. Structures present in the lines of different elements
• 6. The spectral type of HD 50138
• 7. The temperature of the shell
• 8. Is HD 50138 a typical B[e] star?
• References