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Issue A&A Volume 390, Number 3, August II 2002 Page(s) 931 - 935 Section Stellar clusters and associations DOI 10.1051/0004-6361:20020716

A&A 390, 931-935 (2002)
DOI: 10.1051/0004-6361:20020716

The very reddened open clusters Pismis 23 (Lyngå 10) and Stephenson 2

S. Ortolani¹, E. Bica², B. Barbuy³ and Y. Momany<sup>1

1</sup>  Università di Padova, Dept. di Astronomia, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
    e-mail: momany@pd.astro.it
²  Universidade Federal do Rio Grande do Sul, Dept. de Astronomia, CP 15051, Porto Alegre 91500-970, Brazil
    e-mail: bica@if.ufrgs.br
³  Universidade de São Paulo, CP 3386, São Paulo 01060-970, Brazil
    e-mail: barbuy@astro.iag.usp.br

(Received 15 March 2002 / Accepted 7 May 2002 )

Abstract
Pismis 23 and Stephenson 2 are two very reddened open clusters, projected close to the Galactic plane. We present VI and JH photometry for Pismis 23 and  I and Gunn  z for Stephenson 2. We derive a relatively old age of ~700 Myr for Pismis 23, with a reddening value of E(B-V) = 1.73 and a distance  kpc from the Sun. Stephenson 2 has a clump of red supergiants, indicating a young age of about 20 Myr, somewhat younger and more distant (  kpc) than recently reported in the literature. The age estimate for such a young object is crucial for the distance estimate. The high reddening of these two clusters relative to predictions from the diffuse interstellar medium at their distances is due to discrete intervening clouds.

Key words: open clusters and associations: individual: Pismis 23, Stephenson 2 -- stars: Hertzsprung-Russell (HR) and C-M diagrams

Offprint request: B. Barbuy, ortolani@pd.astro.it

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