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Astron. Astrophys. 363, 130-140 (2000)

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Infrared photometry of the Local Group dwarf irregular galaxy IC 10

J. Borissova 1, L. Georgiev 2, M. Rosado 2, R. Kurtev 3, A. Bullejos 2 and M. Valdez-Gutiérrez 4

1 Institute of Astronomy, Bulgarian Academy of Sciences and Isaac Newton Institute of Chile Bulgarian Branch, 72 Tsarigradsko Chaussèe, 1784 Sofia, Bulgaria (jura@haemimont.bg)
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, México (georgiev,margarit@astroscu.unam.mx)
3 Department of Astronomy, Sofia University and Isaac Newton Institute, Branch at Sofia University, James Bourchier Ave. 5, 1164 Sofia, Bulgaria (kurtev@phys.uni-sofia.bg)
4 Instituto Nacional de Astrofísica, Optica y Electrónica, México (mago@inaoep.mx)

Received 25 February 1999 / Accepted 16 June 2000


We present near infrared JHK photometry for the central area of the irregular dwarf galaxy IC 10. Red stellar population of IC 10 contains young (10-50 Myr) massive red supergiants. Most of AGB stars are younger than 1 Gyr and have masses up to 12 [FORMULA]. Comparing the red supergiants of IC 10 and IC 1613 we have determined the reddening of [FORMULA] and the dereddened distance modulus [FORMULA] mag of Population I stars in IC 10. Detection of six [FORMULA] emission structures clearly outline two star forming regions in the central area of IC 10. There is no [FORMULA] emission down to 4.65 [FORMULA] [FORMULA] indicating that the dominant excitation mechanism of the molecular gas is from UV radiation from hot young stars. From the comparison of [FORMULA] and [FORMULA] fluxes, we derive average extinction toward the star forming regions [FORMULA]. The summarized SFR derived from six [FORMULA] and [FORMULA] emission structures in our field of view is 0.6 [FORMULA]

Key words: galaxies: Local Group – galaxies: individual: IC 10, IC 1613 – galaxies: stellar content

Send offprint requests to: J. Borissova

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© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000