The Luminosity Function of the Globular Cluster NGC 6397 Near the Limit of Hydrogen Burning

Details The Luminosity Function of the Globular Cluster NGC 6397 Near the Limit of Hydrogen Burning The Luminosity Function of the Globular Cluster NGC 6397 Near the Limit of Hydrogen Burning

1997-11-03

arxiv.org/abs/astro-ph/9711004v1

Astronomy and Astrophysics

Astrophysics

Tex, 4 pages, 4 figures, 2 style files (apjlet.tex, twocolumns.tex); Astrophysical Journal Letters, accepted

Scientific paper

10.1086/311082

Second-epoch HST observations of NGC 6397 have led to the measurement of proper motions accurate enough to separate the faintest cluster stars from the field, thus extending the luminosity function of this globular cluster far enough to approach the limit of hydrogen burning on the main sequence. We isolate a sample of 1385 main-sequence stars, from just below the turnoff down to I=24.5 (M_I~12.5), which corresponds to a mass of less than 0.1 solar masses for the metallicity of this cluster. Below I=22 (M_I~10), the main-sequence luminosity function drops rapidly, in a manner similar to that predicted by theoretical models of low-mass stars near the hydrogen-burning limit.

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