The neon abundance in WC stars - I. ISO SWS spectroscopy of WR146 (WC6+O)

Details The neon abundance in WC stars - I. ISO SWS spectroscopy of WR146 (WC6+O) The neon abundance in WC stars - I. ISO SWS spectroscopy of WR146 (WC6+O)

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.290..371w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 2, pp. 371-379.

Astronomy and Astrophysics

Astronomy

27

Stars: Abundances, Stars: Evolution, Stars: Individual: Wr146 (Wc6+O), Stars: Wolf-Rayet, Infrared: Stars

Scientific paper

We present infrared spectroscopy in the wavelength range 2.6-20mum of the WC6+O binary system WR146 (MR112) obtained with the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). These data are combined with ground-based optical (INT) and near-IR (UKIRT) spectroscopy and theoretical continuum distributions revealing E(B-V) = 2.8mag, a continuum optical light ratio (WR:O) = 1:2 +/- 1, a probable O8.5V companion and a distance of 750 pc. We obtain C/He=0.15 by number for the WC6 star from an analysis of near-IR recombination lines, a factor of 2 higher than previously estimated by Eenens & Williams. We find a WC6 terminal wind velocity of 2700kms^-1 from the observed [Neiii] 15.5-μm profile, while results from test WCE model atmospheric calculations and radio flux measurements imply M = 2.6 x 10^ - 5M / yr^-1. An analysis of the [Neiii] 15.5-μm line yields a lower limit to the neon abundance of Ne/He=3.4x10^-3 by number. Our ISO spectra show no wind emission in either [Neii] 12.81 μm or [Nev] 14.32 μm from which we estimate Neiv/Neiii <= 1. The resulting bound on the neon abundance in the WC6 star is thus 3.4x10^-3<=Ne/He <=6.8x10^-3. This result is in close accord with the predicted value of Ne/He~6x10^-3 from stellar evolution models of WC stars, during which the products of interior nuclear burning are revealed at the stellar surface.

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