Mathematics – Logic
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1055p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p. 1055-1070
Mathematics
Logic
37
Astrometry, Distance, Globular Clusters, Metallicity, Populations, Spatial Distribution, Spiral Galaxies, Stellar Luminosity, Calibrating, Color-Color Diagram, Color-Magnitude Diagram, Errors, Image Analysis, Interstellar Extinction, Stellar Motions, Stellar Spectrophotometry
Scientific paper
We have obtained photometric BVR, morphological, and astrometric information on 3774 objects located within a 25 arcmin radius of M81. This catalog is complete for 15 less than or = V less than or = 21;it is used here to identify globular cluster candidates in M81 and as a database for a statistical analysis of the system as a whole. The M81 globular cluster system is revealed as a strong surface density excess of approximately 70 objects within an 11 kpe galactocentric radius. The total poplation is estimated at NT = 210 +/- 30 globulars. The spatial, (B-V) and (V-R) distributions are very similar to those of the Milky Way and of M31. Small but significant systematic errors in Madore et al's (1993) photometry could be responsible for an (m-M)0 = 27 .5 +/- 0.3. The globular cluster luminosity function then reaches its maximum at M*V = - 7.5 +/- 0.4, as it does in the galaxy and in M31. There is suggestive evidence that 13 +/- 5 objects are globulars seen through the disk of M81; spectroscopy or high-resolution imaging will resolve this issue. Using the (B-R)0 index to trace(Fe/H), we notice a weak dependence of mean metallicity on galactocentric distance, as observed in the galaxy and in M31. This result argues in favor of in situ globular formation during the continous collapse and self-enrichment of an early-type spiral host.
Perelmuter Jean-Marc
Racine Rene
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