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Astronomy Letters

, 37:635 | Cite as

Photometric variability of five candidates for protoplanetary nebulae

  • V. P. Arkhipova
  • N. P. IkonnikovaEmail author
  • G. V. Komissarova
Article

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.

Keywords

post-AGB supergiants photometric observations variable stars protoplanetary nebulae 

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • V. P. Arkhipova
    • 1
  • N. P. Ikonnikova
    • 1
    Email author
  • G. V. Komissarova
    • 1
  1. 1.Shternberg Astronomical InstituteMoscowRussia

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