Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· On-line Data
· References in the article
· Citations to the Article (31) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (85)
· Associated Articles
· Reads History
·
· Translate This Page
Title:
Red giants in open clusters. IX. NGC 2324, 2818, 3960 and 6259
Authors:
Mermilliod, J.-C.; Clariá, J. J.; Andersen, J.; Piatti, A. E.; Mayor, M.
Affiliation:
AA(Institut d'Astronomie de l'Université de Lausanne, 1290 Chavannes-des-Bois, Switzerland), AB(Observatorio Astronómico, Laprida 854, 5000 Córdoba, Argentina), AC(Niels Bohr Institute for Astronomy, Physics, and Geophysics, Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen, Denmark), AD(Observatorio Astronómico, Laprida 854, 5000 Córdoba, Argentina), AE(Observatoire de Genève, 1290 Sauverny, Switzerland)
Publication:
Astronomy and Astrophysics, v.375, p.30-39 (2001) (A&A Homepage)
Publication Date:
08/2001
Origin:
A&A
Astronomy Keywords:
CLUSTER: OPEN, INDIVIDUAL: NGC 2324, NGC 2818, NGC 3960, NGC 6259, BINARY: SPECTROSCOPIC, STAR: EVOLUTION, STAR: RED GIANT
DOI:
10.1051/0004-6361:20010845
Bibliographic Code:
2001A&A...375...30M

Abstract

We present accurate radial velocities and photoelectric UBV photometry for 73 and 57 red-giant candidates, respectively, in the intermediate-age open clusters NGC 2324, 2818, 3960 and 6259. These data confirm the membership of 47 stars, 12 of which (26%) are spectroscopic binaries; three preliminary orbits have been determined in NGC 3960. From Washington photometry of 8 red giant members, the metallicity of NGC 6259 is found to be [Fe/H] = 0.06 +/- 0.08. At the age of these clusters, most of the red giants are observed in the core-helium (clump) burning phase, the general morphology of which is well reproduced by theoretical models with convective overshooting. However, a number of bona fide cluster giant members are found significantly to the red of the isochrones fitting the rest of the CMD of these and a few other clusters. Some of these stars are binaries, but others seem to be single. In either case, their red colours and/or low luminosities remain unexplained by current stellar evolution theory. Based on observations collected with the Danish 1.54-m telescope at the European Southern Observatory, La Silla (Chile) and at Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, operated by the Association of the Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

Associated Articles

Part  1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Catalog Description     Part 10     Part 11     Part 12     Part 13     Part 14    

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints