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On the Initial Mass Function of Be Stars and the Missing Be Stars of Late Spectral Types

Published online by Cambridge University Press:  12 April 2016

J. Zorec
J. Zorec*
Affiliation:
Institut d’Astrophysique de Paris, CNRS, 98bisbd. Arago, F-75014 Paris, France

Abstract

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This is an attempt at determining the IMF (Initial Mass Function) of Be stars relative to that of B stars in the vicinity of the Sun. We have represented the IMF as a power function of the stellar mass Mβ, so that the relative IMF is then proportional to Mβ(Be)–β(B). Allowing for systematic differences in the counting of Be stars due to their apparent overluminosity, a difference β(Be) – β(B) ~ 0 is found, which may indicate that there are no huge intrinsic differences between the two types of objects. In these calculations changes of spectral types due to high rotation were not taken into account. This effect may still strongly affect the results obtained. By extrapolating the MβBe) – β(B) curve to spectral types later than B7, we reckon that in a volume limited to the apparent magnitude V = 7 there may be about 150 still undetected Be stars of late spectral types.

Type
1. Overview
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 51 - 54
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Coté, J., van Kerkwijk, M.H. 1993, A&A 274, 870 Google Scholar
Garmany, C.D., Conti, P.S. 1982, ApJ 263, 777 Google Scholar
Ghosh, K.K., Apparao, K.M.V., Pukalenthi, S. 1999, A&AS 134, 358 Google Scholar
Hoffleit, D., Jaschek, C. 1982, The Bright Star Catalogue, Yale Univ. Observatory (BSC)Google Scholar
Hoffleit, D., Saladyga, M., Wlasuk, P. 1983, A Supplement to the Bright Star Catalogue, Yale Univ. Observatory (SBSC) Google Scholar
Rana, N.C. 1987, A&A 184, 104 Google Scholar
Scalo, J.M. 1986, Fundamentals of Cosmic Physics 11, 1 Google Scholar
Zinnecker, H. 1989, Towards a Theory of Star Formation. In: Beekman, J.E., Pagel, B.E.J. (eds.), Evolutionary Phenomena in Galaxies. Cambridge University Press, p. 113 Google Scholar
Zorec, J., Briot, D. 1997 A&A 318, 443 Google Scholar
Zorec, J., Mochkovitch, R., Garcia, A. 1990, The Angular Momentum-Loss and the Differential Rotation in B and Be Stars. In: Willson, L.A., Stalio, R.(eds.) NATO ASI Series C, Vol. 316, Angular Momentum and Mass Loss for Hot Stars, Kluwer Academic Publishers, p. 239 Google Scholar