Wolf-Rayet stars in the Local Group galaxies M31 and NGC 6822

Astronomy and Astrophysics – Astronomy

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Andromeda Galaxy, Galactic Clusters, Local Group (Astronomy), Star Distribution, Stellar Spectrophotometry, Wolf-Rayet Stars, Abundance, Mass To Light Ratios, Milky Way Galaxy, Stellar Evolution

Scientific paper

While 21 W-R star candidates have been found in about two-thirds of the giant Sb galaxy M31 by a search to continuum magnitude of B value approximately 21.5, no candidates have been found in the irregular galaxy NGC 6822. Subsequent spectrophotometry has revealed that 17 of the 21 candidates are W-R. While the number of detected W-R stars is low, it is compatible with the total number of luminous and massive stars in each galaxy. In M31, most of the W-R stars lie in the ring of prominent star formation 7-12 kpc from the center. The variation of W-R subclasses with galactocentric distance implies a metallicity gradient similar to that in the Galaxy.

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