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Astron. Astrophys. 324, L33-L36 (1997)

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Letter to the Editor

Hipparcos data on Herbig Ae/Be stars: an evolutionary scenario *

M.E. van den Ancker 1, P.S. Thé 1, H.R.E. Tjin A Djie 1, C. Catala 2, D. de Winter 3, P.F.C. Blondel 1 and L.B.F.M. Waters 1, 4

1 Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, The Netherlands
2 Laboratoire d'Astrophysique et Unité de Recherche associée au CNRS 285, Observatoire Midi-Pyrenées, France
3 Dpto. Física Téorica C-XI, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain
4 SRON Space Research Laboratory, P.O. Box 800, 9700 AV Groningen, The Netherlands

Received 24 April 1997 / Accepted 30 May 1997

Abstract

Fundamental astrophysical parameters (distance, temperature, luminosity, mass, age) of a sample of 10 Herbig Ae/Be candidates and 3 non-emission line A and B stars in star forming regions were computed combining Hipparcos parallaxes with data from literature. All genuine Herbig stars in our sample are located between the birthline and the zero-age main sequence (ZAMS) in the Hertzsprung-Russell diagram (HRD), in accordance with what is expected for pre-main sequence stars. The region in the HRD close to the birthline is relatively devoid of stars when compared to the region closer to the ZAMS, in agreement with the expected evolutionary time scales. The Herbig Ae/Be stars not associated with star forming regions were found to be located close to the ZAMS. Additionally we discuss a possible evolutionary scenario for the circumstellar environment of Herbig stars.

Key words: Circumstellar matter – Stars: Distances – HR diagram – Stars: Pre-main sequence – Stars: Variables

* Based on data from the Hipparcos astrometry satellite.

Send offprint requests to: M.E. van den Ancker (mario@astro.uva.nl)

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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