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Astron. Astrophys. 362, L1-L4 (2000)

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Letter to the Editor

Deep near infrared photometry of new Galactic globular clusters *

V.D. Ivanov 1, J. Borissova 2 and L. Vanzi 3

1 The University of Arizona, Steward Observatory, Tucson, AZ 85721, U.S.A. (vdivanov@as.arizona.edu)
2 Bulgarian Academy of Sciences and Isaac Newton Institute of Chile, Institute of Astronomy, Bulgarian Branch, 72 Tsarigradsko chausseè, 1784 Sofia, Bulgaria (jura@haemimont.bg)
3 European Southern Observatory (ESO), Alonso de Cordova 3107, Santiago - Chile

Received 25 August 2000 / Accepted 18 September 2000

Abstract

We present a preliminary report on the first deep infrared photometry of 2MASS GC01 and 2MASS GC02 (GC01 and GC02 hereafter) - new Galactic globular cluster (GC) candidates, discovered by the 2MASS. They both appear to be genuine disk GCs though highly obscured. The location of the two GCs suggests that they are metal rich - [Fe/H][FORMULA]0.5. We estimated their distance and reddening using the [FORMULA] brightness of the red giant branch (RGB) bump, and [FORMULA] color of the RGB at [FORMULA] mag: [FORMULA], [FORMULA] kpc, and [FORMULA], [FORMULA] mag, for GC01 and GC02 respectively. Variation in the metal abundance can change our results within 30-35%.

Key words: Galaxy: globular clusters: general – Galaxy: abundances – Galaxy: globular clusters: individual: 2MASS GC01 – Galaxy: globular clusters: individual: 2MASS GC02 – stars: Hertzsprung – Russel (HR) and C-M diagrams – stars: distances

* Based on data obtained at the ESO-NTT in La Silla, Chile.

Send offprint requests to: Valentin D. Ivanov

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© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000
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