EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 453/1 Article
Free access article

Issue A&A
Volume 453, Number 1, July I 2006
Page(s) 91 - 99
Section Galactic structure, stellar clusters, and populations
DOI http://dx.doi.org/10.1051/0004-6361:20054716



A&A 453, 91-99 (2006)
DOI: 10.1051/0004-6361:20054716

Photometric and Coravel observations of red giant candidates in three open clusters: membership, binarity, reddening and metallicity

J. J. Clariá1, J.-C. Mermilliod2, A. E. Piatti3 and M. C. Parisi1

1  Observatorio Astronómico, Laprida 854, 5000, Córdoba, Argentina
    e-mail: claria@oac.uncor.edu
2  Laboratoire d'Astrophysique de l'École polytechnique fédérale de Lausanne, Observatoire, 1290 Sauverny, Switzerland
3  Instituto de Astronomía y Física del Espacio, CC 67, Suc. 28, 1428 Buenos Aires, Argentina

(Received 19 December 2005 / Accepted 16 February 2006 )

Abstract
Aims.We present new CORAVEL radial-velocity observations and photoelectric photometry in the $\it UBV$ and $\it DDO$ systems for a sample of potential members of the red-giant branches of NGC 6192, NGC 6208 and NGC 6268, three open clusters projected close to the Galactic center direction. We also examine the properties of a sample of 42 inner disk open clusters projected towards almost the same direction as the three clusters.
Methods.Cluster members and red field giants were discriminated by using the CORAVEL radial-velocity data and by applying two photometric criteria. Interstellar reddening and metal content of the clusters were derived from combined BV and DDO data.
Results.Cluster membership for five red giants in NGC 6192, three in NGC 6208 and three in NGC 6268 has been confirmed by the analysis of the photometric and kinematic data. Photometric membership probabilities show very good agreement with those obtained from CORAVEL radial velocities. Three new spectroscopic binaries were discovered among the red giants of NGC 6192 and NGC 6208. Mean radial velocities and E(B-V) colour excesses were derived.
Conclusions.The overall metallicities were found to be nearly solar for NGC 6208 and above solar for NGC 6192 and NGC 6268. Most of the clusters located closer than 2 kpc from the Sun in the considered direction are slightly more reddened than the absorption resulting from the Baade's window absorption law.


Key words: Galaxy: open clusters and associations: general -- stars: binaries: spectroscopic -- techniques: photometric -- techniques: radial velocities -- stars: abundances



© ESO 2006


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.