Astron. Astrophys. 330, 222-224 (1998)
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
ieva 26, 10000 Zagreb, Croatia
2 Astronomical Institute, Academy of Sciences, 251 65
Ond ejov, Bohemia - Czech
Received 28 July 1997 / Accepted 2 October 1997
An analysis of differential UBV measurements of HD 6226
secured between 1982 and 1995 at Hvar, and combined with the Hipparcos
satellite photometry, led to the finding that
this unfrequently observed star is a new variable, characterized by
occasional brightenings accompanied by the reddening of the
, and blueing of the 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:
stars: variables: other
Send offprint requests to: H. Bo i
© European Southern Observatory (ESO) 1998
Online publication: January 8, 1998