SIMBAD references

1996A&A...305..541C - Astronomy and Astrophysics, volume 305, 541-550 (1996/1-2)

An infrared spectral analysis of two Cygnus WNE stars.

CROWTHER P.A. and SMITH L.J.

Abstract (from CDS):

We investigate whether the stellar parameters and chemistries of Wolf-Rayet stars can be adequately determined from IR observations by focusing on two WN 6 stars which have been the subject of numerous optical studies. Our analysis is based on new UKIRT-CGS4 observations of the strong, broad-lined stars WR 134 (HD191765) and WR 136 (HD192163) in Cygnus. We find excellent agreement in our derived stellar parameters for both stars (T*∼55kK, T2/3∼29kK, logL/L∼5.3, log{dot}(M)/M/yr~-3.9, v∼1900km/s) with previous optical tailored analyses (e.g. Hamann et al. 1994). The numerous unblended H and He emission lines in the IR allow us to determine very accurate H/He ratios for these two stars. We confirm that WR 136 contains substantial hydrogen (∼10% by mass) while less than 1% hydrogen is found for WR 134. We provide a spectral comparison of WN 3-9 stars in the I, H and K-bands and give theoretical intrinsic WN infrared colours of use for future IR studies. We note that the WN 9 star WR 105 (NS4) has a similar spectral morphology to the Galactic Centre helium emission stars (Allen et al. 1990; Krabbe et al. 1991). We also present synthetic 2.5-10µm spectra of WR 136 for comparison with planned ISO spectroscopic observations.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: individual: WR 134 , WR 136 - stars: Wolf-Rayet - stars: mass-loss - infrared: stars

Status at CDS:  

Simbad objects: 18

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