Free access
Astron. Astrophys. Suppl. Ser.
Volume 134, Number 2, January II 1999
Page(s) 301 - 308
DOI: 10.1051/aas:1999142

Astron. Astrophys. Suppl. Ser. 134, 301-308

Membership, binarity and metallicity of red giants in the southern open cluster NGC2354[*]

J.J. Clariá1 - J.-C. Mermilliod2 - A.E. Piatti1

Send offprint request: J.J. Clariá,

1 - Observatorio Astronómico, Laprida 854, 5000 Córdoba, Argentina
2 - Institut d'Astronomie de Lausanne, CH-1290, Chavannes-des-Bois, Switzerland

Received June 17; accepted August 12, 1998


We present new Coravel radial-velocity observations and photoelectric photometry in the UBV, DDO and Washington systems for a sample of red giant candidates in the field of the intermediate-age open cluster NGC2354. Photometric membership probabilities show very good agreement with those obtained from Coravel radial velocities. The analysis of the photometric and kinematical data allow us to confirm cluster membership for 9 red giants, one of them being a spectroscopic binary, while 4 confirmed spectroscopic binaries appear to be probable members. We have also discovered 4 spectroscopic binaries not belonging to the cluster. A mean radial velocity of (33.40 $\pm$ 0.27) km s-1 and a mean reddening E(B-V) = 0.13 $\pm$ 0.03 were derived for the cluster giants. NGC 2354 has a mean ultraviolet excess $<\delta(U-B)\gt$= -0.03 $\pm$ 0.01, relative to the field K giants, and a mean new cyanogen anomaly $\Delta CN = -0.035 $ $\pm$ 0.007, both implying [Fe/H] $\approx$ -0.3. The moderately metal-poor character of NGC2354 is confirmed using five different metal abundance indicators of the Washington system. The cluster giant branch is formed by a well defined clump of 7 stars and 4 stars with high membership probabilities seem to define an ascending giant branch. The whole red giant locus cannot be reproduced by any theoretical track.

Key words: open clusters: individual: NGC2354 -- stars: HR diagram; abundances

SIMBAD Objects

Copyright The European Southern Observatory (ESO)

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 You should disable this module if you wish to use the OpenURL server that you or your library have defined.