Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants

Details Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346..819v&link_type=abstract

Astronomy and Astrophysics, v.346, p.819-830 (1999)

Astronomy and Astrophysics

Astrophysics

23

Stars: Atmospheres, Stars: Fundamental Parameters, Stars: Mass-Loss, Stars: Supergiants

Scientific paper

We present the second paper of a series whose aim is to perform a global study of Galactic A-supergiants. Very little work has been carried out to determine the stellar parameters of these stars. This is illustrated with a brief review of some previous works. In this paper we analyze the determination of absolute magnitudes, spectral types and atmospheric parameters using the most recent Kurucz LTE blanketed model atmospheres and we discuss the applicability of the calibrations, such as the Schmidt-Kaler's (\cite{Sch-K}) calibration. Rotation is also an important parameter in A-supergiants but their rotational velocities are poorly known. We have calculated projected rotational velocities from the Fourier analysis of the observed Mg II (4481 Ä) line. Based on observations made with the INT and JKT telescopes operated on the island of La Palma by the RGO in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofisica de Canarias, with the 2.2m telescope at Calar Alto Observatory, Spain, with the Bernard Lyot 2m telescope at Pic Du Midi Observatory, France and observations collected at the European Southern Observatory at La Silla, Chile

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