Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..779a&link_type=abstract
Astronomy Letters, Vol. 30, Issue 11, p.779-784
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present our photoelectric and spectroscopic observations of the early B supergiant with an IR excess IRAS 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 Delta V = 0.4 mag, Delta B = 0.4 mag, and Delta U = 0.5 mag. IRAS 19200+3457 and three other hot post-AGB stars - V886 Her, V1853 Cyg, and LSIV-12°111 - exhibit a similar variability pattern. Our low-resolution spectroscopic observations in the period 2001-2003 show that the spectrum of IRAS 19200+3457 represents an early B star with hydrogen emission lines originating from a circumstellar gaseous envelope. The HeI lambda 5876, 6678, 7065 A, and OI lambda 7774 A lines are in absorption. The hydrogen and, probably, HeI lines proved to be variable. Our observations confirm the conclusion that IRAS 19200+3457 belongs to the class of intermediate-mass protoplanetary objects.
Arkhipova V. P.
Esipov Valentine F.
Ikonnikova N. P.
Komissarova G. V.
Noskova R. I.
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