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Astron. Astrophys. 358, 113-116 (2000)


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Research Note

On the galactic latitude distribution of rotational velocity for evolved stars *

J.R. De Medeiros, J.C. Carvalho, B.B. Soares, C. da Rocha and M.R.G. Maia

Universidade Federal do Rio Grande do Norte, Departamento de Física, 59072-970, Natal, RN, Brazil

Received 12 August 1999 / Accepted 12 April 2000

Abstract

We study the galactic latitude distribution of rotational velocity of a large sample of about 1 220 evolved stars of luminosity classes IV, III, II and Ib, with spectral types F, G and K. We show that there is a tendency for stars with enhanced rotational velocity to concentrate near the galactic plane. Such a trend is more evident for the more evolved stars.

Key words: stars: fundamental parameters – stars: rotation – stars: statistics – Galaxy: general – Galaxy: stellar content

* Based on observations collected at the Observatoire de Haute - Provence (France) and at the European Southern Observatory, La Silla (Chile).

Send offprint requests to: J.R. De Medeiros

Correspondence to: renan@dfte.ufrn.br

© European Southern Observatory (ESO) 2000

Online publication: June 26, 2000

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