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J/A+A/317/689       Hot subdwarfs proper motions     (Thejll+ 1997)

Proper motion of the hot subdwarfs. The kinematic population membership of the SdB Thejll P., Flynn C., Williamson R., Saffer R. <Astron. Astrophys. 317, 689 (1997)> =1997A&A...317..689T
ADC_Keywords: Stars, subdwarf ; Proper motions Keywords: astrometry - stars: subdwarf - fundamental parameters - Galaxy: stellar content Description: We report on first results from an ongoing program to measure and analyze proper motions for hot subdwarf and white dwarf stars, with the aim of determining to which stellar population sdB stars (in the V magnitude range 10.5 to 14.5) belong. Ours is the largest sample of hot subdwarf proper motions measured to date. Our kinematic analysis suggests that the parent population of these hydrogen-rich sdB stars is as old or older than the old disk. We measure the absolute magnitude of the sdB in the field as MV=4.5, providing independent confirmation of absolute V magnitude estimates for these stars from clusters and spectroscopic analyses. Provided it can be shown that the sdO stars evolve from the sdB, then the sdO absolute V magnitude distribution is about 1 magnitude brighter than for the sdB, and 1 magnitude wider. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sd.dat 96 138 Astrometric results for the hot subdwarfs (table4 to 9 of the paper) wd.dat 80 42 White dwarf astrometric results from the AC/CAMC and the POSS/GSC efforts (table10 & 11 of the paper) tables.tex 79 532 LaTeX version of the tables
Byte-by-byte Description of file: sd.dat
Bytes Format Units Label Explanations
2- 3 I2 h RAh Right ascension J2000 5- 6 I2 min RAm Right ascension J2000 8- 12 F5.2 s RAs Right ascension J2000 14 A1 --- DE- Declination sign 15- 16 I2 deg DEd Declination J2000 18- 19 I2 arcmin DEm Declination J2000 21- 25 F5.2 arcsec DEs Declination J2000 27- 31 F5.4 arcsec/yr pm1 Proper motion from the AC/CAMC system 33- 37 F5.4 arcsec/yr e_pm1 rms uncertainty on pm1 39- 41 I3 deg pmPA1 Position angle for proper motion from the AC/CAMC system (counted positive east of north) 45- 46 I2 deg e_pmPA1 rms uncertainty on PA1 50- 53 F4.3 arcsec/yr pm2 ? Proper motion from the POSS/GSC system 56- 59 F4.3 arcsec/yr e_pm2 ? rms uncertainty on pm2 62- 64 I3 deg pmPA2 ? Position angle for proper motion from the POSS/GSC system (positive east of north) 68- 69 I2 deg e_pmPA2 ? rms uncertainty on PA2 71- 96 A26 --- Note Note
Byte-by-byte Description of file: wd.dat
Bytes Format Units Label Explanations
2- 3 I2 h RAh Right ascension J2000 5- 6 I2 min RAm Right ascension J2000 8- 12 F5.2 s RAs Right ascension J2000 14 A1 --- DE- Declination sign 15- 16 I2 deg DEd Declination J2000 18- 19 I2 arcmin DEm Declination J2000 21- 25 F5.2 arcsec DEs Declination J2000 27- 31 F5.4 arcsec/yr pm Proper motion 33- 37 F5.4 arcsec/yr e_pm rms uncertainty on pm 39- 41 I3 deg pmPA Position angle for proper motion (counted positive east of north) 45- 46 I2 deg e_pmPA rms uncertainty on PA 50- 51 A2 --- Class WD Spectral class (1) 53- 73 A21 --- Name Various names for the star taken from the McCook & Sion catalog. (2)
Note (1): WD spectral class derived from positions and the WD catalog III/129 Note (2): PG and KPD refers to stars in Green et al. (1986ApJS...61..305G) and Downes (1986ApJS...61..569D).
Acknowledgements: Peter A. Thejll References: Downes R.A., 1986, ApJS 61, 569 =1986ApJS...61..569D Green, R. F. et al., 1986, ApJS 61, 305 =1986ApJS...61..305G McCook G.P. & Sion E.M., 1987, ApJS 65, 603 =Cat III/129
(End) Patricia Bauer [CDS] 01-Aug-1996
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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