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Be Star Surveys in Open Clusters with Balmer-line Photometry

Published online by Cambridge University Press:  12 April 2016

Gemma Capilla ,
Juan Fabregat  and
Deborah Baines
Gemma Capilla
Affiliation:
Departamento de Astronomía, Universidad de Valencia, 46100 Burjassot, Spain
Juan Fabregat
Affiliation:
Departamento de Astronomía, Universidad de Valencia, 46100 Burjassot, Spain
Deborah Baines
Affiliation:
Department of Physics & Astronomy, University of Leeds, U.K

Abstract

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We present CCD Hα and Hβ photometry of young open clusters. We show that the comparison of the α and β photometric indices provides an efficient tool for identifying emission line stars. We report on the discovery of several new Be stars.

The preliminary results of our survey are the following: i. the younger clusters (age < 10 Myr) are almost lacking of Be stars, ii. clusters in the age interval 10–30 Myr are rich in Be stars. Almost all of them are of spectral types earlier than B5, while late-type Be stars are scarce. These results point towards an evolutionary interpretation of the Be phenomenon, in the sense that Be stars are close to the end of their main sequence lifetime.

Type
1. Overview
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 63 - 66
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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