J/AJ/112/1489 J/AJ/112/1489 Spectroscopic survey for binaries in NGC 5053 L Yan J G Cohen Astron. J. 112 1489 1996 1996AJ....112.1489Y Binaries, spectroscopic Clusters, globular Radial velocities We carried our a radial velocity survey for spectroscopic binaries in the low-density globular cluster NGC 5053. Our sample contains a total of 77 cluster member giant and subgiant stars with visual magnitudes of 14.5-18.6. Of These 77 stars, 66 stars have on average of 3-4 measurements with a total of 236 velocities. A typical velocity error per measurement is 13km/s. The stars in our sample are spatially distributed from the cluster center out to 10arcmin in radius (4.5 core radii). Among theses 66 stars with multiple velocity measurements, we discovered 6 spectroscopic binary candidates.

Star Star identification name --- RAh Right ascension (1950) h RAm Right ascension (1950) min RAs Right ascension (1950) s DEd Declination (1950) deg DEm Declination (1950) arcmin DEs Declination (1950) arcsec Dist Radial distance from the cluster arcsec HJD Heliocentric Julian date of observation d HRV Heliocentric radial velocity km/s e_HRV rms uncertainty on HRV km/s Star Star identification name --- RAh Right ascension (1950) h RAm Right ascension (1950) min RAs Right ascension (1950) s DEd Declination (1950) deg DEm Declination (1950) arcmin DEs Declination (1950) arcsec Dist Radial distance from the cluster arcsec n_VR Number of observations --- VR Weighted mean radial velocity number=1 When n_VR=1, only one measurement km/s e_VR External velocity error in a single measurement estimated from the dispersion about the mean km/s chi2 Radial velocity variability over the timespan of three years --- P(<chi2) Probability number=2 To evaluate the significance of the variations represented by chi2, we calculated the probability P(<chi2) of having a chi2 at least this large purely due to chance fluctuations with a Gamma function Q(0.5{nu}, 0.5chi2), here {nu} is the number of the degree of freedom. Reasonable limits of chi2 probability for identifying significant variations are 0.01-0.001. --- V0 Deredenned V magnitude number=3 Photmetry for stars beginning by S is from Sandage et al. (1977AJ.....82..389S) mag (B-V)0 Deredenned B-V colour index number=3 Photmetry for stars beginning by S is from Sandage et al. (1977AJ.....82..389S) mag table2.texTeX version of table 2 Patricia Bauer CDS 1997Nov17Lin Yan <lyan@eso.org> J_AJ_112_1489.xml