Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682

Details Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682 Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...470..919m&link_type=abstract

Astronomy and Astrophysics, Volume 470, Issue 3, August II 2007, pp.919-926

Astronomy and Astrophysics

Astrophysics

10

Galaxy: Open Clusters And Association: General, Stars: Binaries: Spectroscopic, Techniques: Radial Velocities, Stars: Late-Type

Scientific paper

Aims:We studied the membership and binarity of 123 red giants in six old open clusters, NGC 2112, 2204, 2243, 2420, 2506 and 2682, to define more precisely the evolutionary path on the red-giant branch. Methods: The analysis is based on 185 radial-velocity observations with the Coravel spectrographs and available photometric data. Results: The membership of 93 red giants was confirmed on the basis of the radial velocities. Seven definitive spectroscopic binaries were identified and 11 additional stars are suspected of being binaries. The binary frequency (19%) is slightly lower than average. This is partly due to the small number of observations secured for each star. Orbital elements have been determined for the first time for the BaII star NGC 2420-173 (D) and those of the other BaII star NGC 2420-250 (X) have been improved. The values of the cluster mean velocities have been significantly improved. Conclusions: With the new membership estimates and binary detections, the existing CCD data allow precise definition of the red-giant loci. A number of stars in NGC 2506, 2420 and 2204 appear to define an asymptotic branch, the position of which differs significantly from that predicted by the models.
Based on observations collected with the Danish 1.54-m and ESO 1-m telescopes at the European Southern Observatory, La Silla, Chile.

Affiliated with

Also associated with

No associations

Rating

Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Red giants in open clusters. XII. Six old open clusters NGC 2112, 2204, 2243, 2420, 2506, 2682 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-957364