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Photometric Variability and Spectrum of the Post-AGB Candidate IRAS 19200+3457
We present our photoelectric and spectroscopic observations of the earlyB supergiant with an IR excess IRAS 19200+3457, a poorly known post-AGBcandidate. The star has been found to be photometrically variable. Weobserved rapid irregular brightness variations with amplitudes up toDelta V = 0.4 mag, Delta B = 0.4 mag, and Delta U = 0.5 mag. IRAS19200+3457 and three other hot post-AGB stars - V886 Her, V1853 Cyg, andLSIV-12°111 - exhibit a similar variability pattern. Ourlow-resolution spectroscopic observations in the period 2001-2003 showthat the spectrum of IRAS 19200+3457 represents an early B star withhydrogen emission lines originating from a circumstellar gaseousenvelope. The HeI lambda 5876, 6678, 7065 A, and OI lambda 7774 A linesare in absorption. The hydrogen and, probably, HeI lines proved to bevariable. Our observations confirm the conclusion that IRAS 19200+3457belongs to the class of intermediate-mass protoplanetary objects.
| Mesures de vitesses radiales. VIII. Accompagnement AU sol DU programme d'observation DU satellite HIPPARCOS
We publish 1879 radial velocities of stars distributed in 105 fields of4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbachet al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90}using the Fehrenbach objective prism method. Table 1 only available inelectronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations
Abstract image available at:http://adsabs.harvard.edu/abs/1976ApJS...30...97D
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Calgi |
| Sað Açýklýk: | 19h17m59.51s |
| Yükselim: | +34°45'53.0" |
| Görünürdeki Parlaklýk: | 8.351 |
| Uzaklýk: | 257.732 parsek |
| özdevim Sað Açýklýk: | -1.6 |
| özdevim Yükselim: | -1.9 |
| B-T magnitude: | 8.357 |
| V-T magnitude: | 8.352 |
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