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Astron. Astrophys. 350, 485-490 (1999)

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Research Note

Time-resolved spectroscopy of the peculiar H[FORMULA] variable Be star HD 76534

René D. Oudmaijer and Janet E. Drew

Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London, SW7 2BZ, UK

Received 27 May 1999 / Accepted 5 August 1999

Abstract

We present time-resolved spectroscopy of the Be star HD 76534, which was observed to have an H[FORMULA] outburst in 1995, when the line went from photospheric absorption to emission at a level of more than two times the continuum within 2.5 hours. To investigate the short-term behaviour of the spectrum of HD 76534 we have obtained 30 spectra within two hours real-time and searched for variations in the spectrum. Within the levels of statistical significance, no variability was found. Rather than periodic on short time scales, the H[FORMULA] behaviour seems to be commonly episodic on longer ([FORMULA] 1 year) time scales, as an assessment of the existing data on the H[FORMULA] line and the Hipparcos photometry suggests. HD 76534 underwent only 1 photometric outburst in the 3 year span that the star was monitored by the Hipparcos satellite.

Key words: stars: activity – stars: circumstellar matter – stars: emission-line, Be – stars: individual: HD 76534 – stars: mass-loss – stars: variables: general

Send offprint requests to: René D. Oudmaijer (r.oudmaijer@ic.ac.uk)

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© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999
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