Supernova rates and the reddening of Wolf-Rayet stars

Details Supernova rates and the reddening of Wolf-Rayet stars Supernova rates and the reddening of Wolf-Rayet stars

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..133v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. 133-135.

Astronomy and Astrophysics

Astrophysics

7

Interstellar Extinction, Milky Way Galaxy, Red Shift, Stellar Evolution, Supernovae, Wolf-Rayet Stars, Absorption Spectra, Statistical Analysis, Stellar Magnitude

Scientific paper

An improved estimate for the local surface density of W-R stars is obtained. The frequency distribution of absorption values for W-R stars within 2 kpc of the sun is found to be adequately represented by the relation N(Av) varies as exp (-Av/10), i.e., half of all W-R stars have Av greater than 7 mag. The discovery rate of young SN Ibc is argued to be very strongly affected by absorption in dusty clouds located close to these objects. Early O-type stars are, on average, observed to be much less reddened than W-R stars at similar distances. It is inferred that the sample of known early-O stars is less complete than the W-R sample. This indicates that the mass spectrum of star formation contains more very massive stars than was previously believed. From the fact that SN Ibc are about 13 mag brighter than their W-R precursors, and from the observed V magnitude distribution of W-R stars, it is calculated that the Galactic frequency of massive (greater than about 35 solar masses) core-collapse supernovae with V(max) less than 0 is about 0.2 per millennium.

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