J/A+AS/125/75 J/A+AS/125/75 UBV photometry of Be stars K Pavlovski P Harmanec H Bozic P Koubsky P Hadrava S Kriz Z Ruzic S Stefl Astron. Astrophys. Suppl. Ser. 125 75 1997 1997A&AS..125...75P Photometry, UBV Stars, Be stars: emission-line, Be stars: individual (omicron Cas, QR Vul) stars: variables: general 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 13848 UBV measurements secured. Simultaneously, 9648 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.

omicron CasHD 418000 44 43.4+48 17 04 QR VulHD 19268520 15 15.8+25 35 31

HD HD (Cat. <III/135>) number --- Name Other name of star --- Vmag Johnson V magnitude mag B-V Johnson B-V index mag U-B Johnson U-B index mag SpType Spectral type --- HD HD (Cat. <III/135>) number --- Name Other name of star --- Season Number of seasons yr o_Vmag Number of UBV measurements --- Vmag Johnson V magnitude mag e_Vmag Standard deviation in Vmag mag Bmag Johnson B magnitude mag e_Bmag Standard deviation in Bmag mag Umag Johnson U magnitude mag e_Umag Standard deviation in Umag mag SpType Spectral type --- Patricia Bauer CDS 1997Sep09Kresimir Pavlovski <kresimir@geof.hr> J_A+AS_125_75.xml