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Young Stellar Populations in M31, M33, and NGC 6822

  • J. B. Hutchings (a1), B. Cavanagh (a1), L. Bianchi (a2), R. Chandar (a2) and S. Scuderi (a3)...

Abstract

We have been pursuing a program of hot star UV spectroscopy in local group galaxies over several years with HST. We have also obtained WFPC2 images in parallel and pointed exposures with several broad band filters.

• The imaging data have been used to generate colour-magnitude plots of central fields, clusters and halo fields in M31, M33 and NGC 6822. We have compared these with high-mass model isochrones from recent models, to examine the stellar populations that are indicated. M33 contains a substantial young cluster population whose mass and age appear to be related. The western outer wisps of NGC 6822 contain a relatively young population of stars.

• Most of the spectra have been reported and modelled in published papers: we note here the first comparison of stars in NGC 6822 with others from local group galaxies.

• We have also discussed the interstellar extinction in M31 and find it is similar to the Galaxy after allowance for comparable amounts of halo extinction that resembles that of the Magellanic Clouds.

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Copyright

References

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Bertelli, G., Bressan, A., Chiosi, C., Fagotto, F., Nasi, E. 1994, A&AS, 106, 275
Bianchi, L., Hutchings, J.B., Massey, P. 1996a, AJ, 111, 2303
Bianchi, L., Bohlin, R., Clayton, G., Hutchings, J., Massey, P. 1996b, BAAS, 187, 4511
Bianchi, L. 1998, ESA SP-413, p. 553
Chandar, R., Bianchi, L., Ford, H. 1998, A&AS, submitted
Scuderi, S., Bianchi, L. 1997, BAAS, 29, 806

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