EDP Sciences
Free access
Volume 442, Number 1, October IV 2005
Page(s) 195 - 200
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20053093

A&A 442, 195-200 (2005)
DOI: 10.1051/0004-6361:20053093

Red giant branch stars as probes of stellar populations

II. Properties of the newly discovered globular cluster GLIMPSE-C01
V. D. Ivanov1, R. Kurtev2 and J. Borissova1

1  European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile
    e-mail: [vivanov;jborisso]@eso.org
2  Departamento de Física y Meteorología, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 644, Playa Ancha, Casilla 53, Valparaíso, Chile
    e-mail: rkurtev@uv.cl

(Received 19 March 2005 / Accepted 26 May 2005)

Deep near infrared photometry of the newly discovered Galactic globular Cluster GLIMPSE-C01 is reported. We derived for the first time the metal abundance of this object from the slope of the RGB: ${\rm [Fe/H]}=-1.61\pm0.14$ in the scale of Zinn (as implemented in Harris 1996), ${\rm [Fe/H]}=-1.44\pm0.12$ in the scale of Caretta & Gratton (1997), and ${\rm [Fe/H]}=-1.12\pm0.12$ in the scale of Ferraro et al. (1999). The tip and the clump of the red giant branch were used to confirm the estimates of Kobulnicky et al. (2005), placing the cluster at $D\sim3.7\pm0.8$ kpc, behind $A_{\rm V}\sim15$ mag of visual extinction. The best fit to the radial surface brightness profile with a single-mass King's model yielded a core radius $r_{\rm c}=0.78$ arcmin, tidal radius $r_{\rm t}=27$ arcmin and central concentration c=1.54.

Finally, we estimate the number of the "missing" globulars in the central region of the Milky Way. Based on the spatial distribution of the known clusters, and assuming radial symmetry around the Galactic center, we conclude that the Milky Way contains at least $10\pm3$ undiscovered objects. The distribution of known clusters in the bulge seem to resemble the orientation of the Milky Way bar.

Key words: Galaxy: globular clusters: general -- Galaxy: abundances -- stars: distances -- Galaxy: bulge -- Galaxy: fundamental parameters

SIMBAD Objects

© ESO 2005

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.