Astron. Astrophys. Suppl. Ser. 137, 351-362

Understanding A-type supergiants

I. Ultraviolet and visible spectral atlas of A-type supergiants

E. Verdugo¹ - A. Talavera² - A.I. Gómez de Castro³

Send offprint request: E. Verdugo

1 - ISO Data Centre, P.O. Box 50727, E-28080-Madrid, Spain
e-mail: everdugo@iso.vilspa.esa.es
2 - LAEFF/INTA, P.O. Box 50727, E-28080-Madrid, Spain
e-mail: ati@laeff.esa.es
3 - Instituto de Astronomía y Geodesia (CSIC-UCM), Fac. cc. Matemáticas, Universidad Complutense, Av. Complutense s/n, E-28040-Madrid, Spain
e-mail: aig@orion.mat.ucm.es

Received October 14, 1997; accepted April 12, 1999

Abstract:

This paper is the first of a series whose aim is to perform a systematic study of A-type supergiant atmospheres and winds. Here we present a spectral atlas of 41 A-supergiants observed by us in high and medium resolution in the visible and ultraviolet. The atlas consists of profiles of the H$\alpha$, H$\beta$, H$\gamma$,H$\delta$, H$\epsilon$, Ca II (H and K), Na I (D1 and D2), Mg II₄₄₈₁, Mg II [uv1] and Fe II [uv1, uv2, uv3, uv62, uv63, uv161] lines for 41 stars with spectral types ranging from B9 to A9 and luminosity classes Ia, Iab and Ib, and provides the basic data for a thoughtful study of these stars. The overall characteristics of the sample as well as the data reduction procedures are described. We also present some examples of spectral variability.

Key words: atlases -- line: profiles -- stars: supergiants -- ultraviolet: stars