Deep HST-NICMOS Observations of Low Mass Stars in omega CEN

Details Deep HST-NICMOS Observations of Low Mass Stars in omega CEN Deep HST-NICMOS Observations of Low Mass Stars in omega CEN

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.8002d&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #80.02; Bulletin of the American Astronomical Society, Vol. 29, p.1338

Astronomy and Astrophysics

Astronomy

Scientific paper

A 20\arcsec x 20\arcsec field located ~ 7\arcmin away from the center of the massive galactic globular cluster omega Cen (NGC5139) was observed by the NIC2 camera of the NICMOS instrument on board HST through the F110W and F160W broad band filters centered at 1.1 mu and 1.6 mu for a total of 3,000 and 4,000 seconds for the two filters, respectively. Standard photometric analysis of the resulting images yields 340 stars with a signal above a 8 sigma threshold in both filters covering the range of HST H-band magnitudes between 20 and 26, the deepest probe yet in these bands of a globular cluster. These objects form a well defined sequence in the H vs J-H plane that is consistent with the theoretical near IR color-magnitude diagram expected from recent low mass stellar model calculations. The resulting stellar luminosity function increases steadily with increasing magnitude up to a peak at H =~ 24.5, where it turns over and drops slowly down to the detection limit set by the incompleteness limit of 60% at H =~ 25.5. With the theoretical mass-luminosity relationship that provides the best fit to the IR color-magnitude diagram, we obtain an excellent fit to the observed luminosity function down to a mass of ~ 0.2Msun with a power law mass function having a alpha = -1 slope.

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