Photometric variability and spectrum of the post-AGB candidate IRAS 19200+3457статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present our photoelectric and spectroscopic observations of the early B supergiant with an IR excess WAS 19200+3457, a poorly known post-AGB candidate. The star has been found to be photometrically variable. We observed rapid irregular brightness variations with amplitudes up to DeltaV = 0(m)4, DeltaB = 0(m)4, and DeltaU = 0(m)5. IRAS 19200+3457 and three other hot post-AGB stars-V886 Her, V1853 Cyg, and LSIV - 12degrees 111 -exhibit a similar variability pattern. Our low-resolution spectroscopic observations in the period 2001-2003 show that the spectrum of WAS 19200+3457 represents an early B star with hydrogen emission lines originating from a circumstellar gaseous envelope. The HeI lambda5876 lambda6678 Angstrom, lambda7065 Angstrom, and OI lambda7774 Angstrom lines are in absorption. The hydrogen and, probably, HeI lines proved to be variable. Our observations confirm the conclusion that WAS 19200+3457 belongs to the class of intermediate-mass protoplanetary objects. (C) 2004 MAIK "Nauka/Interperiodica".