Astronomy & Astrophysics

Free access article

Issue		A&A Volume 381, Number 2, January II 2002
Page(s)		472 - 480
Section		Stellar clusters and associations
DOI		10.1051/0004-6361:20011565

A&A 381, 472-480 (2002)
DOI: 10.1051/0004-6361:20011565

Metallicity and radial velocity of the second parameter globular cluster Terzan 1 in the galactic bulge

T. P. Idiart¹, B. Barbuy¹, M.-N. Perrin², S. Ortolani³, E. Bica⁴ and A. Renzini⁵

¹ Universidade de São Paulo, CP 3386, São Paulo 04301-904, Brazil
    e-mail: barbuy@iagusp.usp.br
² Observatoire de Paris, 61 Av. de l'Observatoire, 75014 Paris, France
    e-mail: Marie-Noel.Perrin@obspm.fr
³ Università di Padova, Dept. di Astronomia, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
    e-mail: ortolani@pd.astro.it
⁴ Universidade Federal do Rio Grande do Sul, Dept. de Astronomia, CP 15051, Porto Alegre 91501-970, Brazil
    e-mail: bica@if.ufrgs.br
⁵ European Southern Observatory, Karl Schwarzschild Strasse 2, 85748, Garching bei München, Germany
    e-mail: arenzini@eso.org

(Received 21 August 2001 / Accepted 19 October 2001 )

Abstract
Terzan 1 is the globular cluster with closest projection relative to the Galactic center. We report radial velocities and metallicities of 17 stars in order to investigate their membership in the cluster. From the 11 probable members of Terzan 1, a radial velocity of $v_{\rm r} = 114 \pm 14$ km s ^-1 is obtained. For this sample an intermediate metallicity of ${\rm [Fe/H]}\approx -1.3$ is found, in agreement with previous work based on HST Colour-Magnitude Diagrams.

Key words: globular clusters: individual: Terzan 1 -- techniques: spectroscopic

Offprint request: T. P. Idiart, thais@iagusp.usp.br

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