Photometric variability of five candidates for protoplanetary nebulae |
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Authors: | V P Arkhipova N P Ikonnikova G V Komissarova |
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Institution: | 1.Shternberg Astronomical Institute,Moscow,Russia |
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Abstract: | We analyze long-term UBV observations and ASAS-3 photometry for five candidates for protoplanetary nebulae—F and G supergiants with infrared excesses
at highG alactic latitudes—V340 Ser, IRAS 05113+1347, V552 Pup, V448 Lac, and RV Col. These stars exhibit quasi-periodic multifrequency
light variations caused by pulsations with characteristic time scales from 83 to 139 days, depending on the stellar temperature.
Cooler stars undergo variations with larger amplitudes and periods. The variations at close frequencies with a period ratio
of 1.03–1.09 are responsible for the amplitude modulation revealed for most program stars. |
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