Near Infrared Photometry of the Stellar and Sub-stella Population in the Orion Great Nebula

Details Near Infrared Photometry of the Stellar and Sub-stella Population in the Orion Great Nebula Near Infrared Photometry of the Stellar and Sub-stella Population in the Orion Great Nebula

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21443203s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #432.03; Bulletin of the American Astronomical Society, Vol. 41, p.703

Astronomy and Astrophysics

Astronomy

Scientific paper

We present JHK photometry of the Orion Nebula Cluster obtained with the ISPI camera at the CTIO Blanco 4m telescope. A 30arcmin x 40arcmin region has been covered with 11 contiguous fields with 300s typical exposure time. Our final catalog contains 7766 sources. Their magnitudes, converted in the 2MASS photometric system, are in the range 8We analyze the Luminosity Functions (LFs), the color-color and color magnitude diagrams comparing the results obtained for different projected distances from the cluster center. The largest fraction of sources with IR excess compatible with a circumstellar disk is found in the inner core (projected radius<0.7pc), whereas at intermediate distances (0.7 to 1.6pc) the average extinction rises, compatible with a youn population still embedded in the OMC1 cloud. Dereddening our photometry using theoretical evolutionary models for a 1Myr isochrone we estimate the mass of our point-like sources. We discuss the dependency of the LF and IMF on the distance from theta1 Ori-C, which shows signs of variations in the ratio of
stellar-to-substellar populations.

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