Other
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..917a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 94, Oct. 1987, p. 917-947.
Other
55
Astronomical Photometry, Color-Magnitude Diagram, Galactic Clusters, Stellar Luminosity, Red Giant Stars, Statistical Analysis, Stellar Evolution
Scientific paper
CCD photometry for faint stars in NGC 6397, combined with a digital reinvestigation of the photographic plates originally used by Alcaino and Liller (1980), has been used to obtain statistically significant samples for the various evolutionary phases, down to V ≡ 21 mag, i.e., more than 5 mag below the turnoff. With a cluster distance modulus of the order of 12.50 mag this implies that main-sequence stars were observed down to MV ≡ 8.5 mag, corresponding to M ≡ 0.5 M_sun;. The authors report evidence for a flattening of the luminosity function for MS stars fainter than MV ≡ 6 mag (M ≡ 0.7 M_sun;), in agreement with previous indications by other authors. It is shown that, to reconcile the cluster age with current estimates for other galactic globular clusters, one needs to assume Z = 10-4 and a cluster reddening of E(B-V) ≡ 0.20 mag, plus an additional reddening of δ(B-V) = 0.04 mag in the location of theoretical isochrones in the CM diagram.
Alcaino Gonzalo
Buonanno Roberto
Caloi Vittoria
Castellani Vittorio
Corsi Carlo E.
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