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J/A+AS/140/309      Blue-Hα objects in M33            (Fabrika+, 1999)

A survey of blue - Hα objects in the galaxy M33. Fabrika S., Sholukhova O. <Astron. Astrophys. Suppl. Ser. 140, 309 (1999)> =1999A&AS..140..309F
ADC_Keywords: Galaxies, nearby ; Stars, early-type ; Stars, blue Keywords: nearby galaxies: stellar content: individual (M33) - stars: early type - Hα 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 Hα images of this galaxy. From 2332 listed OB stars, we have isolated 549 objects, which have Hα 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 Hα, among them 154 diffuse (d) and 180 bubble-type (b) nebulae. 117 objects are compact (c) and faint Hα sources. These groups are different in colour indices, Hα fluxes, surface brightness and sizes. The most probable size of the Hα 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 Hα stars is AV=0.93±0.05mag. We classify the faintest stars as blue Ib supergiants, their average absorption is AV∼0.6mag. They are restricted in number by the limiting stellar magnitude in the original sample. Objects: ------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------ 01 33 54.0 +30 40 07 M 33 = NGC 598 ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 29 549 Selected emission objects
See also: J/ApJS/89/85 : Blue and red supergiants in M33 (Ivanov+ 1993) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- FSZ [1/549] Sequential number 5- 8 I4 --- IFM-B Number of Ivanov et al., Cat. J/ApJS/89/85 10- 14 F5.2 mag Vmag V magnitude 16- 20 F5.1 --- S Hα excess parameter 22- 25 F4.1 arcsec Diam ? Diameter (objects too close to bright HII regions could not be determined) 28- 29 A2 --- Morph Morphological type (1)
Note (1): Morphological type as follows: b = bubble-type c = unclassified d = diffuse s = stellar zs = objects for which it turned out to be impossible to determine the size because of their closeness to bright HII regions
History: From A&A electronic version
(End) Patricia Bauer [CDS] 26-May-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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