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J/AJ/112/1489       Spectroscopic survey for binaries in NGC 5053  (Yan+ 1996)

A spectroscopic survey for binary stars in the globular cluster NGC 5053. Yan L., Cohen J.G. <Astron. J. 112, 1489 (1996)> =1996AJ....112.1489Y
ADC_Keywords: Clusters, globular ; Binaries, spectroscopic ; Radial velocities Abstract: 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2a 62 248 Relative radial velocities of stars in NGC 5053 (individual data) table2b 78 77 Relative radial velocities of stars in NGC 5053 (average data) table2.tex 234 469 TeX version of table 2
Byte-by-byte Description of file: table2a
Bytes Format Units Label Explanations
1- 5 A5 --- Star Star identification name 7- 8 I2 h RAh Right ascension (1950) 10- 11 I2 min RAm Right ascension (1950) 13- 18 F6.3 s RAs Right ascension (1950) 19 A1 --- DE- Declination sign 20- 21 I2 deg DEd Declination (1950) 23- 24 I2 arcmin DEm Declination (1950) 26- 31 F6.3 arcsec DEs Declination (1950) 33- 37 F5.1 arcsec Dist Radial distance from the cluster 39- 50 F12.4 d HJD Heliocentric Julian date of observation 52- 56 F5.1 km/s HRV Heliocentric radial velocity 58- 61 F4.1 km/s e_HRV rms uncertainty on HRV
Byte-by-byte Description of file: table2b
Bytes Format Units Label Explanations
1- 5 A5 --- Star Star identification name 7- 8 I2 h RAh Right ascension (1950) 10- 11 I2 min RAm Right ascension (1950) 13- 18 F6.3 s RAs Right ascension (1950) 19 A1 --- DE- Declination sign 20- 21 I2 deg DEd Declination (1950) 23- 24 I2 arcmin DEm Declination (1950) 26- 31 F6.3 arcsec DEs Declination (1950) 33- 37 F5.1 arcsec Dist Radial distance from the cluster 39- 40 I2 --- o_VR Number of observations 42- 46 F5.1 km/s VR Weighted mean radial velocity (1) 48- 51 F4.1 km/s e_VR External velocity error in a single measurement estimated from the dispersion about the mean 53- 60 F8.3 --- chi2 ? Radial velocity variability over the timespan of three years 62- 67 F6.4 --- P(<chi2) ? Probability (2) 69- 73 F5.2 mag V0mag Deredenned V magnitude (3) 75- 78 F4.2 mag (B-V)0 ? Deredenned B-V colour index (3)
Note (1): When o_VR=1, only one measurement Note (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(0.5ν, 0.5chi2), here ν is the number of the degree of freedom. Reasonable limits of chi2 probability for identifying significant variations are 0.01-0.001. Note (3): Photmetry for stars beginning by S is from Sandage et al. (1977AJ.....82..389S)
Acknowledgements: Lin Yan
(End) Patricia Bauer [CDS] 17-Nov-1997
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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