Astron. Astrophys. 329, 579-582 (1998)

Research Note

uvby photometry of Coronae Borealis during 1994 and 1995^*

Juan Fabregat ¹ and Saul J. Adelman <sup>2

1</sup> Departamento de Astronoma, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain
² Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, USA

Received 21 July 1997 / Accepted 27 August 1997

Abstract

We present differential uvby photometry of CrB obtained in 1994 and 1995, complemented by Balmer line spectroscopy. This star has been constant during this period, showing no short term periodic variability with an amplitude greater than 0.005 mag., nor long term variations greater than 0.01 mag. The lack of variability is associated with an inactive phase of the Be star, in which no emision features are present in the spectra.

The only remarkable event observed was a fading episode on JD 2449779, with an amplitude of about 0.02 magnitudes in all bandpasses and duration of 0.2 - 0.3 days.

Key words: stars: emission-line, Be stars: individual: CrB

* Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: J. Fabregat (juan@pleione.matapl.uv.es)

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Contents

• 1. Introduction
• 2. Observations
  • 2.1. Photometry
  • 2.2. Spectroscopy
• 3. Discussion
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997
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