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Astron. Astrophys. 330, 222-224 (1998)

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HD 6226: a new bright B variable with occasional brightenings.
Is it an unrecognized Be star?

H. Boi 1 and P. Harmanec 2

1 Hvar Observatory, Faculty of Geodesy, University of Zagreb, Ka ieva 26, 10000 Zagreb, Croatia (hbozic@geodet.geof.hr)
2 Astronomical Institute, Academy of Sciences, 251 65 Ond ejov, Bohemia - Czech Republic (hec@sunstel.asu.cas.cz)

Received 28 July 1997 / Accepted 2 October 1997

Abstract

An analysis of differential UBV measurements of HD 6226 secured between 1982 and 1995 at Hvar, and combined with the Hipparcos satellite [FORMULA] photometry, led to the finding that this unfrequently observed star is a new variable, characterized by occasional brightenings accompanied by the reddening of the [FORMULA], and blueing of the [FORMULA] index. We note that such behaviour was found for several Be stars like QR Vul or o  Cas and it would be of interest to check whether also HD 6226 is not an unrecognized Be star. A period analysis of the photometric data indicates a possibility that the brightenings may occur periodically, with a period of 481.3 d. However, this finding needs to be tested since several other possible periods were also detected. Moreover, there is no a priori reason to believe that the brightenings must occur in regular intervals. If there is indeed a 481-d periodicity, then the nearest brightening should occur around Nov. 27, 1998. A spectroscopic study of the star will be crucial for a better understanding of its nature but further photometric monitoring is also very desirable.

Key words: stars: HD 6226 – stars: emission-line – stars: variables: other

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© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998
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