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A&A Supplement Series, Vol. 125, October I 1997, 75-98

Received July 25; accepted December 19, 1996

UBV photometry of Be stars at Hvar: 1972-1990

K. Pavlovskitex2html_wrap2673, P. Harmanectex2html_wrap2675, H. Bozictex2html_wrap2673, P. Koubskýtex2html_wrap2675, P. Hadravatex2html_wrap2675, S. Kriztex2html_wrap2683, Z. Ruzictex2html_wrap2685, and S. Stefltex2html_wrap2675

Send offprint request: K. Pavlovski

tex2html_wrap2689  Opservatorij Hvar, Geodetski fakultet Sveucilista u Zagrebu, Kaciceva 26, 10000 Zagreb, Croatia \* \* \* Internet:;
tex2html_wrap2691  Astronomicky ustav Akademie ved Ceske republiky, 25165 Ondrejov, Czech Republic \* \* \* Internet: hec(koubsky,had,sstefl)
tex2html_wrap2693  SK Press, Masarykovo namesti 35, 25101 Ricany, Czech Republic
tex2html_wrap2695  Odjel za fiziku i biofiziku, Medicinski fakultet Sveucilista u Zagrebu, Salata 3, 10000 Zagreb, Croatia \* \* \* Internet:


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 tex2html_wrap_inline2651 UBV measurements secured. Simultaneously, tex2html_wrap_inline2655 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.

keywords: stars: Be -- stars: Omicron Cas; QR val -- stars: variable

Copyright by the European Southern Observatory (ESO)