A detailed study of a very late WN star in M 33.

Details A detailed study of a very late WN star in M 33. A detailed study of a very late WN star in M 33.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..830s&link_type=abstract

Astronomy and Astrophysics, v.302, p.830

Astronomy and Astrophysics

Astrophysics

31

Stars: Abundances, Stars: Fundamental Parameters, Stars: Wolf-Rayet, Stars: Individual: Mca1-B (M 33), Stars: Individual: R 84 (Lmc), Galaxies: Individual: M 33

Scientific paper

We present the first quantitative analysis of a M 33 Wolf-Rayet star, the Ofpe/WN9 candidate MCA1-B (Willis et al. 1992). From new higher resolution observations analysed with the Wolf-Rayet standard model, we reclassify MCA1-B as WN9 and find its stellar parameters (T_*_=29kK, T_eff_=19kK, log L/Lsun_=5.8, log ˙(M)/Msun_/yr=-4.0, vinfinity_=420km/s) to be very similar to the LMC WN9 stars (Crowther et al. 1995a), and R84 in particular. Chemical abundances (H/He=2.6, N/He=0.003, C/N<0.1) are also comparable to R84 indicating a similar evolutionary status (probable dormant LBV) and metallicity (Z~0.008) consistent with its location in the outer regions of M 33.

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