Astrophysical properties of a luminous Wolf-Rayet type object in the core of the extragalactic H II region IC 132 from an analysis of its lambda-lambda 1200-6000 A spectrum

Details Astrophysical properties of a luminous Wolf-Rayet type object in the core of the extragalactic H II region IC 132 from an analysis of its lambda-lambda 1200-6000 A spectrum Astrophysical properties of a luminous Wolf-Rayet type object in the core of the extragalactic H II region IC 132 from an analysis of its lambda-lambda 1200-6000 A spectrum

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..157d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 203, Apr. 1983, p. 157-164.

Astronomy and Astrophysics

Astronomy

3

H Ii Regions, Intergalactic Media, Stellar Spectra, Ultraviolet Spectra, Wolf-Rayet Stars, Interstellar Extinction, Interstellar Gas, Iue, Stellar Temperature, Visible Spectrum

Scientific paper

We discuss the λλ1200-6000 Å spectrum of the ionizing source of the extragalactic H II region IC 132 in M33. The optical spectrum shows a broad λ4686 Å emission: the UV data from lUE show emission lines of N V, N IV, N III, C IV and He II. The WR features suggest an early WN classification with equivalent widths about a factor of 2 weaker than in galactic WR stars of that type.
If the object is a single star, the data are consistent with the central source of IC 132 having a temperature of 40000 ± 5000 K and MBol = -11.6. This would make it the brightest star in the galaxy M33, with a mass larger than lOOMsun.
Alternatively, we show that the data are equally well represented by a multiple system, consisting of three components (04 V + 09.5 I + WN4). In either of these two cases, our result confirms that the most luminous hot stars of a spiral or irregular galaxy are likely to be found in the cores of its giant H II regions and in many cases show WR features in their spectra.

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