The ultraviolet and optical spectrum and evolutionary status of HD62910 (WN6-C4)

Details The ultraviolet and optical spectrum and evolutionary status of HD62910 (WN6-C4) The ultraviolet and optical spectrum and evolutionary status of HD62910 (WN6-C4)

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232...89w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 89-113.

Astronomy and Astrophysics

Astrophysics

14

Optical Emission Spectroscopy, Stellar Evolution, Stellar Spectra, Ultraviolet Spectroscopy, Wolf-Rayet Stars, Iue, Line Spectra, Spectrophotometry, Ultraviolet Spectra, Visible Spectrum

Scientific paper

A detailed study is presented of the combined UV-optical spectroscopy for the WN-C composite spectrum star HD62910. A reddening of E(B-V) = 0.80 + or - 0.05 is derived along with an intrinsic UV-optical continuum energy distribution fitted by a blackbody at about 30,000 K. The composite subtypes are confirmed as WN6 and WC4. The linewidths of both the WN and WC features are analyzed, and it is shown that the results can be used to infer that the WN and WC lines are formed in the same stellar wind, consistent with the object being a single star. A non-LTE Sobolev analysis of the emission line strengths of selected He, C, and N and optical and UV lines yields mass abundance estimates intermediate between those derived for single WNE and WC stars. It is concluded that HD62910 is a single WR star on its way from a WN6 to a WCE stage. The implications of these results are discussed in the context of current WR evolutionary scenarios.

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