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Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters
Context: Radial velocities have proved to be an efficient method formembership determination if there are at least 2 or 3 red giants in acluster. They are necessary for galactic studies, but are still missingfor many open clusters. Aims: We present the final catalogues of along-term observing programme performed with the two coravelspectrovelocimeters for red giants in open clusters. The main aims wereto detect spectroscopic binaries and determine their orbital parameters,determine the membership, and compute mean velocities for the stars andopen clusters. Methods: We computed weighted mean radial velocities for1309 stars from 10 517 individual observations, including the systemicradial velocities from spectroscopic orbits and for cepheids. Results:The final results are contained in three catalogues collecting 10 517individual radial velocities, mean radial velocities for 1309 redgiants, and mean radial velocities for 166 open clusters among whichthere are 57 new determinations. We identified 891 members and 418non-members. We discovered a total of 288 spectroscopic binaries, amongwhich 57 are classified as non-members. In addition 27 stars were judgedto be variable in radial velocities and they are all red supergiants. Conclusions: The present material, combined with recent absolute propermotions, will permit various investigation of the galactic distributionand space motions of a large sample of open clusters. However, thedistance estimates still remain the weakest part of the necessary data.This paper is the last one in this series devoted to the study of redgiants in open clusters based on radial velocities obtained with thecoravel instruments.Based on observations collected at the Haute-Provence Observatory(France) and on observations collected with the Danish 1.54-m telescopesat the European Southern Observatory, La Silla, Chile. Full Tables [seefull textsee full textsee full textsee full textsee full text] to [seefull textsee full textsee full textsee full textsee full text] are onlyavailable and Tables [see full textsee full textsee full textsee fulltextsee full text] and [see full textsee full textsee full textsee fulltextsee full text] are also available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/485/303
| Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.
| Absolute proper motions of open clusters. I. Observational data
Mean proper motions and parallaxes of 205 open clusters were determinedfrom their member stars found in the Hipparcos Catalogue. 360 clusterswere searched for possible members, excluding nearby clusters withdistances D < 200 pc. Members were selected using ground basedinformation (photometry, radial velocity, proper motion, distance fromthe cluster centre) and information provided by Hipparcos (propermotion, parallax). Altogether 630 certain and 100 possible members werefound. A comparison of the Hipparcos parallaxes with photometricdistances of open clusters shows good agreement. The Hipparcos dataconfirm or reject the membership of several Cepheids in the studiedclusters. Tables 1 and 2 are only available in electronic form at theCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Membership and photometric abundances of red evolved stars in open clusters
UBV and DDO photometric observations of 31 red evolved stars toward 11open clusters, obtained with the 41-cm and 91-cm telescopes at CerroTololo Interamerican Observatory on four nights in 1978, are reported.The data are compiled in tables and characterized for each cluster, andtwo criteria are used to determine the probability that a star is amember of a cluster. Six of the clusters are found to contain oneevolved red star, one has two, one has four, and three have none; theother 19 stars are seen as red field objects. The estimated cluster Fe/Habundance ratios range from -0.2 to +0.3, and the red giants in theclusters NGC 2335 and NGC 2567 are found to have CN strengths like thoseseen in Hyades giants. The unusual weakness of the 421.6-nm band of CNfor star 108 in NGC 2548 is attributed either to unusual composition andproper motion or to its nonmembership in the cluster despite meeting thephotometric criteria.
| DDO photometry on red giants in the open clusters NGC 2232, NGC 2287, and NGC 2451
From DDO photometry combined with U, B, V photometry of red stars in theopen clusters NGC 2232, NGC 2287, and NGC 2451, the mean color excess E(B-V), the distance modulus, and the mean metal abundance (Fe/H) werederived for the clusters. The physical parameters, surface gravity,effective temperature, and spectral type were also obtained for the redstars. Estimation of age yielded 1.1 x 10 to the 8th yr for NGC 2287,and for NGC 2451, 4.8 x 10 to the 8th. The cluster NGC 2232 should beolder than 10 to the 9th yr.
| High-luminosity red stars in or near galactic clusters. Paper I
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974PASP...86..960E&db_key=AST
| First Supplement to the list of transit tables for star numberings in open clusters.
Not Available
| Photometric study of the open cluster NGC 2232
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&A....19..303C&db_key=AST
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Pozíciós és asztrometriai adatok
| Csillagkép: | Egyszarvú |
| Rektaszcenzió: | 06h26m58.35s |
| Deklináció: | -04°27'33.5" |
| Vizuális fényesség: | 6.89 |
| Távolság: | 204.499 parszek |
| RA sajátmozgás: | 1.6 |
| Dec sajátmozgás: | -2.5 |
| B-T magnitude: | 8.701 |
| V-T magnitude: | 7.04 |
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