Issue |
Astron. Astrophys. Suppl. Ser.
Volume 125, Number 1, October I 1997
|
|
---|---|---|
Page(s) | 75 - 98 | |
DOI | https://doi.org/10.1051/aas:1997213 | |
Published online | 15 October 1997 |
UBV photometry of Be stars at Hvar: 1972–1990*
1
Opservatorij Hvar, Geodetski fakultet Sveučilišta u Zagrebu, Kačićeva 26, 10$\,$000 Zagreb, Croatia
2
Astronomický ústav Akademie věd České republiky, 251$\,$65 Ondřejov, Czech Republic
3
SK Press, Masarykovo náměstí 35, 251$\,$01 Říčany, Czech Republic
4
Odjel za fiziku i biofiziku, Medicinski fakultet Sveučilišta u Zagrebu, Šalata 3, 10$\,$000 Zagreb, Croatia
Send offprint request to: K. Pavlovski
Received:
25
July
1996
Accepted:
19
December
1996
A summary of results of the systematic UBV photoelectric monitoring
of bright northern Be stars carried out at the Hvar Observatory between
1972 and 1990 is presented. Altogether, 76 Be stars of all luminosity
classes were observed and
UBV measurements secured.
Simultaneously,
UBV measurements of 48 check stars (most of them
of early spectral types) were obtained. A careful transformation of all
observations into the standard Johnson system allowed detection and
monitoring of even very mild long-term light and colour variations
of these objects. Almost all early-type Be stars in the sample turned out
to be variable. For several stars phase-locked light variations related
to their binary nature were established. Sudden brightenings, on a time scale
of a few days, were detected for o Cas and QR Vul.
Key words: stars: Be / stars: Omicron Cas; QR val / stars: variable
© European Southern Observatory (ESO), 1997