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J/A+AS/140/309 Blue-Halpha objects in M33 (Fabrika+, 1999)
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Beginning of ReadMe :J/A+AS/140/309 Blue-Halpha objects in M33 (Fabrika+, 1999)
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A survey of blue - Halpha objects in the galaxy M33.
Fabrika S., Sholukhova O.
<Astron. Astrophys. Suppl. Ser. 140, 309 (1999)>
=1999A&AS..140..309F
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ADC_Keywords: Galaxies, nearby ; Stars, early-type ; Stars, blue
Keywords: nearby galaxies: stellar content: individual (M33) -
stars: early type - Halpha excess
Abstract:
For the purposes of a search for SS433 type objects, LBV stars and
hypergiants in M33, we have carried out a photometry of blue stars in
Halpha images of this galaxy. From 2332 listed OB stars, we have
isolated 549 objects, which have Halpha excess over stars of the
same V magnitude. Among them 81 emission stars (s) have been selected.
About 60% of isolated objects found to be extended in Halpha, among
them 154 diffuse (d) and 180 bubble-type (b) nebulae. 117 objects are
compact (c) and faint Halpha sources. These groups are different in
colour indices, Halpha fluxes, surface brightness and sizes. The
most probable size of the Halpha nebulae is FWHM=10-14pc. There
is evidence that their properties and location in the galaxy are
defined by interstellar gas pressure and related to spiral arms.
The d objects are HII regions with an embedded star. The b objects
are probably envelopes around WR stars or SN remnants. Among s-type
objects we isolated a group of 20 brightest stars, which in their
average properties fit well to the parameters of blue hypergiants or
LBV-type stars. The stars of intermediate brightness follow very well
to blue Ia supergiants. The interstellar absorption derived from
brightest Halpha stars is A_V_=0.93+/-0.05mag. We classify the
faintest stars as blue Ib supergiants, their average absorption is
A_V_ 0.6mag. They are restricted in number by the limiting stellar
magnitude in the original sample.
Objects:
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RA (2000) DE Designation(s)
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01 33 54.0 +30 40 07 M 33 = NGC 598
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