J/A+AS/106/79 J/A+AS/106/79 A new frequency anaylsis of photometric observ D Heynderickx U Haug Astron. Astrophys. Suppl. Ser. 106 79 1994 1994A&AS..106...79H Stars, early-type Stars, variable stars: early-type stars: individual (IL Vel) stars: oscillations stars: variables: other We present a new frequency-analysis of Johnson UBV-data of the {beta} Cephei star IL Vel, obtained between 1977 and 1979. This new analysis was inspired by more recent measurements of IL Vel in the Walraven five-colour photometric system. These data suggested the presence of frequencies not found in the original analysis of the UBV-data. From the new analysis, we conclude that four frequencies can be identified with certainty in the variations of IL Vel: f_0_=5.464973+/-0.000005, f_1_=5.363229+/-0.000006, f_2_=5.48838+/-0.00002 and f_3_=5.44184+/-0.00003, in cycles per day. The frequencies f_0_, f_2_ and f_3_ form a closely spaced triplet.

HJD Heliocentric Julian Day d Vw Walraven V, log(intensity) mag (V-B)w Walraven V-B, log(intensity) mag (B-U)w Walraven B-U, log(intensity) mag (U-W)w Walraven U-W, log(intensity) mag (B-L)w Walraven B-L, log(intensity) mag HJD Heliocentric Julian Day d V Johnson V mag B Johnson B mag U Johnson U mag Patricia Bauer CDS 1994Mar23 J_A+AS_106_79.xml