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2. The Peak Brightness and Spatial Distribution of AGB Stars Near the Nucleus of M32

Author

Davidge, T. J., Rigaut, F., Chun, M., Brandner, W., Potter, D., Northcott, M., and Graves, B.

Subjects
Astrophysics (astro-ph), Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

The bright stellar content near the center of the Local Group elliptical galaxy M32 is investigated with 0.12 arcsec FWHM H and K images obtained with the Gemini Mauna Kea telescope. Stars with K = 15.5, which are likely evolving near the tip of the asymptotic giant branch (AGB), are resolved to within 2 arcsec of the nucleus, and it is concluded that the peak stellar brightness near the center of M32 is similar to that in the outer regions of the galaxy. Moreover, the projected density of bright AGB stars follows the visible light profile to within 2 arcsec of the nucleus, indicating that the brightest stars are well mixed throughout the galaxy. Thus, there is no evidence for an age gradient, and the radial variations in spectroscopic indices and ultraviolet colors that have been detected previously must be due to metallicity and/or some other parameter. We suggest that either the bright AGB stars formed as part of a highly uniform and coherent galaxy-wide episode of star formation, or they originated in a separate system that merged with M32., Comment: 9 pages of text, 3 figures. ApJ (Letters) in press

Published
2000
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3. Identification of domoic acid as the toxic agent responsible for the P.E.I. contaminated mussel incident: a summary of work conducted at the Atlantic Research Laboratory of the National Research Council, Halifax, between 13 Dec. 1987 and 11 Jan. 1988

Author

Bird, C. J., Boyd, R. K., Brewer, D., Craft, C. A., de Freitas, A. S. W., Dyer, E. W., Embree, D. J., Falk, M., Flack, M. G., Foxall, R. A., Gillis, C., Greenwell, M., Hardstaff, W. R., Jamieson, W. D., Laycock, M. V., LeBlanc, P., Lewis, N. I., McCulloch, A. W., McCully, G. K., McInerney-Northcott, M., McInnes, A. G., McLachlan, J. L., Odense, P., O'Neil, D., Pathak, V., Quilliam, M. A., Ragan, M. A., Seto, P. F., Sim, P. G., Tappen, D., Thibault, P., Walter, J. A., Wright, J. L. C., Backman, A. M., Taylor, A. M., Dewar, D., Gilgan, M., and Richard, D. J. A.

Published
1988

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