Photometric variability of five candidates for protoplanetary nebulae

Details Photometric variability of five candidates for protoplanetary nebulae Photometric variability of five candidates for protoplanetary nebulae

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astl...37..635a&link_type=abstract

Astronomy Letters, Volume 37, Issue 9, pp.635-648

Astronomy and Astrophysics

Astronomy

Post-Agb Supergiants, Photometric Observations, Variable Stars, Protoplanetary Nebulae

Scientific paper

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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