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Photometry of yellow semiregular variables : HR 8752 (= V 509 Cassiopeiae).

1992; EDP Sciences; Volume: 263; Linguagem: Inglês

1432-0746

John R. Percy, É. Zsoldos,

Astronomy and Astrophysical Research

New photoelectric photometry of the yellow semiregular variable HR 8752 (=V509 Cas) made between 1986 and 1991 is presented. Its light curve is very complex, showing a steady decrease in brightness and colours. Period analysis revealed two (possibly three) periods with changing amplitudes. The origin of the amplitude changes may be a change from fundamental to overtone pulsation though other explanations are equally possible. The evolutionary state of the variable is uncertain. A possible connection between HR 8752 and the HII zone S151 is pointed out