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Ultraviolet classification of Wolf-Rayet stars

Published online by Cambridge University Press:  07 August 2017

Krzysztof Rochowicz
Krzysztof Rochowicz*
Affiliation:
Instytut Astronomii UMK, ul. Chopina 12/18, 87-100 Torun, Poland

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The ultraviolet spectra of 94 WR stars obtained from Vilspa IUE archive are used here to look for classification criteria in the UV region alone. We have tried to select as many single and SB1 type stars as possible in the Galaxy and the LMC to get the complete, flux-calibrated spectra between 1150 and 3250 Å. Altogether 56 (34 of WN and 22 of WC type) stars in the Galaxy and 38 (31 of WN and 7 of WC type) in the LMC were found, for which at least single SWP and LWR (or LWP) low resolution images are accessible – note that this is about one third of the number of known galactic and LMC WR stars. The set of stars we study is representative according to spectral subtype and brightness (it is almost complete to 12 magnitude for galactic stars). See Niedzielski & Rochowicz (1994) for the list of program stars and associated IUE images as well as for the details of reduction.

To look for classification criteria of WR stars in the ultraviolet region we will use the equivalent width (EW) and line width (FWHM) data.

Type
Session I - Basic parameters, properties of single Wolf-Ray et stars
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 50 - 51
Copyright
Copyright © Kluwer 1995 

References

Hillier, D.J. 1988, ApJ 327, 822 Google Scholar
Hillier, D.J. 1989, ApJ 347, 392 CrossRefGoogle Scholar
Niedzielski, A., Rochowicz, K. 1994, A&A Suppl. (in press) Google Scholar