The Nature of the FBS Blue Stellar Objects

Details The Nature of the FBS Blue Stellar Objects The Nature of the FBS Blue Stellar Objects

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confq..17s&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 17-17"

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Using the digitization technique for the photographic observations done during 1987-1991 and 1997-2000 with the Byurakan 2.6m and OHP 1.9m telescopes, we have obtained 650 digitized spectra for 450 FBS blue stellar objects (BSOs) (plus a number of CCD spectra). The digitized spectra have been standardized and reduced automatically in MIDAS package as for CCD ones. The BSO spectra were analyzed in order to get correct classifications, discover new interesting objects, which help us understanding the nature of the FBS BSOs. These objects contain white dwarfs (WD), hot subdwarfs (sd), horizontal branch B stars (HBB), cataclysmic variables (CV), planetary nebula (PNN) and extragalactic objects such as quasars and Seyfert galaxies. All galactic objects are important for studying the structure of Our Galaxy and stellar evolution, while the extragalactic ones are important for re-estimation of the surface density of the bright QSO/Sy. For objects in the FBS zones with central DEC=+43°, +39° and +35°, we have already obtained about 15 WDs, 150 sd-s, 15 HBBs, 1 new planetary nebula, 1 new CV, Seyfert galaxies and some new bright quasars. Some objects have been identified with X-ray sources and proper motion has been found for some white dwarfs. The overall analysis and statistics for the FBS blue stellar objects is done, and their nature is discussed.

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