Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...154..321b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 154, no. 1-2, Jan. 1986, p. 321-335. SNSF-supported research.
Astronomy and Astrophysics
Astrophysics
19
Astronomical Photometry, Globular Clusters, Spiral Galaxies, Star Distribution, Stellar Luminosity, Charge Coupled Devices, Microdensitometers
Scientific paper
25 reliable candidates for globular clusters were detected in a radius of 13arcmin around the galaxy NGC 253 in the Sculptor group. 3 candidates are blue clusters and 4 are redder than the globular clusters in our galaxy. The spatial distribution of these clusters follows the D1/4 law. A study of the appearance of the globular clusters at large (over 1 Mpc) distances is carried out using the new cluster size classification. A revised distance of 2.88 Mpc for NGC 253 is proposed. As a by-product the field stars luminosity function and the B-V distribution are presented and compared with the model predictions. Similar results are presented for field galaxies. The total number of clusters is evaluated at 80±42. A comparison with other known systems in spiral galaxies gives a simple law for the frequency coefficient in spirals: S = 4.6 (KI-0.1). The number of clusters per unit luminosity of the halo component appears to be constant for spiral galaxies of all types ranging from Sa to Sc.
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