Low mass stars in globular clusters. II. The mass function of M15.

Details Low mass stars in globular clusters. II. The mass function of M15. Low mass stars in globular clusters. II. The mass function of M15.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..202d&link_type=abstract

Astronomy and Astrophysics, v.304, p.202

Astronomy and Astrophysics

Astrophysics

66

Globular Clusters: General, Individual (M 15), Hertzprung-Russell (Hr) Diagram, Stars: Low-Mass, Stars: Luminosity Function, Mass Function

Scientific paper

We have used the WFPC2 on board HST to investigate the stellar population in a field located 4.6' NW of the center of the globular cluster M15 by means of deep imaging in wide bands centered at 606 and 812nm. A total of 7770 stars are accurately classified by two-color photometry to form a color-magnitude diagram extending down to a limiting magnitude m_814_=~m_I_=~25.5, determined reliably and solely by counting statistics. At m_814_=~22.5 we detect a steepening of the main sequence slope, in accordance with theoretical models that predict such a feature as a consequence of the opacity change due to the effect of H_2_ in the atmosphere. The main sequence luminosity function increases with decreasing luminosity following a power-law trend with index α=~1.3 in the range 3.5

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