Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-11-09
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
5 pages, 6 figures, accepted to Variable Stars (Peremennye Zvezdy)
Scientific paper
New UBV-photometry obtained in 2000-2008 is presented for the post-AGB star IRAS 22272+5435=V354 Lac. The star showed semi-regular light variations with varying amplitudes. The maximal amplitude did not exceed 0.5 in V-band. For 2000-2008, we have found a photometric period near 128 days. The analysis of long-term observations in 1990-2008 reveals variations with two close periods: 128 and 131 days, causing amplitude modulation. The V-(B-V) diagram shows a clear correlation: the star is generally bluer when brighter. From our UBV data, we derive E(B-V)=0.5 and conclude that the spectral type of the star varies between K1 to K7 during pulsations. The mean UBV-data of V354 Lac have not changed during the past 19 years: V=8.60, B-V=2.06 and U-B=2.14.
Arkhipova V. P.
Ikonnikova N. P.
Komissarova G. V.
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