Optical spectroscopy of WR stars in M 33 and M 31

Details Optical spectroscopy of WR stars in M 33 and M 31 Optical spectroscopy of WR stars in M 33 and M 31

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..169s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 1, Oct. 1990, p. 169-177.

Astronomy and Astrophysics

Astrophysics

21

Optical Emission Spectroscopy, Stellar Radiation, Wolf-Rayet Stars, Abundance, Carbon, Line Spectra, Stellar Spectra

Scientific paper

New optical spectroscopy of 6 WR stars in the local group galaxy M 33 and 6 WR stars in M 31 is presented. The previous WR classifications of the M 31 stars is confirmed. In the M 33 sample, four stars are classified as WC4-5, one is confirmed as WN-WCE, and a further WN-WCE star is identified. The widths of the C IV 5800-A emission differ by a factor of three among the M 33 WC4-5 sample, spanning values exhibited by Galactic WC8-WC4 stars and confirming the existence of narrow-lined WC4-5 stars in M 33. It is found that the M 33 WCE line widths appear to be correlated with galactocentric distance and loosely connected to ambient metallicity. The narrowest-lined WCE star, MC53, is an unusually high metallicity region.

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