Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997bsao...43..149f&link_type=abstract
Bulletin of the Special Astrophysical Observatory, Vol. 43, p. 149 - 163
Astronomy and Astrophysics
Astrophysics
3
Galaxies: H Alpha Surveys, Galaxies: H Ii Regions, Galaxies: Diffuse Nebulae
Scientific paper
Blue stars with Hα excess in the galaxy M33 are investigated. On the basis of photometry of their Hα images 81 stars, 154 diffuse nebulae, 180 bubble-type nebulae and 117 intermediate objects have been selected. These groups are different in colours, fluxes, surface brightness and sizes in Hα, and their distribution over the galaxy. There is evidence that their location in the galaxy and properties are defined by interstellar gas parameters and related to spiral arms. The diffuse nebulae are H II regions with an embedded star. The bubbles are probably envelopes around WR stars or SN remnants. Among the stars the authors isolate a group of 20 brightest stars, which in their average properties fit well to the parameters of blue super-supergiants or LBVs. The stars of intermediate brightness follow very well to supergiants of average spectral type B1 Ia. The interstellar absorption is derived. The authors classify the faintest stars as blue Ib supergiants, their average absorption is AV ≍ 0m6. In this case these are seen only in the nearest face part of the galaxy disk, but not through the whole depth of it.
Fabrika Sergei N.
Sholukhova O. N.
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