Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..927a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 927-950.
Astronomy and Astrophysics
Astronomy
48
Local Group (Astronomy), Stellar Spectra, Wolf-Rayet Stars, Charge Coupled Devices, Magellanic Clouds, Milky Way Galaxy, Sky Surveys (Astronomy)
Scientific paper
CCD surveys in regions of M31, M33, NGC 6822, and IC 1613 are used to obtain a large number of spectra of Wolf-Rayet (WR) candidates in order to determine the relative population of WR stars in these galaxies, the correlation that exists between metallicity and the WC/WN ratio, and the possible variance of stellar wind properties from system to system. Two examples of intermediate WN/WC objects in M31 are found that are similar to those known in the Galaxy and LMC. The M33 and M31 WN stars are like those of the Galaxy and LMC, while the WN stars of NGC 6822 have weaker lines and are more like the WN stars found in the SMC. The WC stars in M33 and M31 are peculiar in that stars with narrow and strong lines are lacking. Available data on Galactic stars reveal that the WC stars with both narrow and strong lines are preferentially found in the inner part of the Milky Way along with the WC8 and WC9 stars which are missing in M33 and M31.
Armandroff Taft E.
Massey Philip
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