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Title:
Obscured clusters. II. GLIMPSE-C02 - A new metal rich globular cluster in the Milky Way
Authors:
Kurtev, R.; Ivanov, V. D.; Borissova, J.; Ortolani, S.
Affiliation:
AA(Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Ave. Gran Bretaña 1111, Playa Ancha, Casilla 53, Valparaíso, Chile ), AB(European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile ), AC(Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Ave. Gran Bretaña 1111, Playa Ancha, Casilla 53, Valparaíso, Chile ), AD(Universitá di Padova, Dipartimento di Astronomia, Vicolo dell'Osservatorio 5, 35122 Padova, Italy )
Publication:
Astronomy and Astrophysics, Volume 489, Issue 2, 2008, pp.583-587 (A&A Homepage)
Publication Date:
10/2008
Origin:
EDP Sciences
Keywords:
Galaxy: globular clusters: general, Galaxy:, abundances, stars: distances, stars: abundances, Galaxy: globular clusters: individual: GLIPMSE-CO2
DOI:
10.1051/0004-6361:200809425
Bibliographic Code:
2008A&A...489..583K

Abstract

Context: The estimated total number of Milky Way globulars is 160 ± 20. The question of whether there are any more undiscovered globular clusters in the Milky Way is particularly relevant with advances in near and mid-IR instrumentation.
Aims: This investigation is a part of a long-term project to search the inner Milky Way for hidden star clusters and to study them in detail. GLIMPSE-C02 (G02) is one of these objects, situated near the Galactic plane (l = 14.129 deg, b = -0.644 deg).
Methods: Our analysis is based on SOFI/NTT JHKS imaging and low resolution (R˜ 1400) spectroscopy of three bright cluster red giants in the K atmospheric window. We derived the metal abundance by analysis of these spectra and from the slope of the RGB.
Results: The cluster is deeply embedded in dust and undergoes a mean reddening of AV ~ 24.8 ± 3 mag. The distance to the object is D = 4.6 ± 0.7 kpc. The metal abundance of G02 is [Fe/H]H96 = -0.33± 0.14 and [Fe/H]CG = -0.16 ± 0.12 using different scales. The best fit to the radial surface brightness profile with a single-mass King's model yields a core radius rc = 0.70 arcmin (0.9 pc), tidal radius rt = 15 arcmin (20 pc), and central concentration c = 1.33.
Conclusions: We demonstrate that G02 is new Milky Way globular cluster, among the most metal rich globular clusters in the Galaxy. The object is physically located at the inner edge of the thin disk and the transition region with the bulge, and also falls in the zone of the “missing” globulars toward the central region of the Milky Way.

Based on observations collected with the ESO New Technology Telescope, observing program 77.D-0089. Table with photometry is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/489/583

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