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J/AJ/115/296        SDSS new variables          (Henden+ 1998)

New variables in the Sloan Digital Sky Survey calibration fields. Henden A.A., Stone R.C. <Astron. J. 115, 296 (1998)> =1998AJ....115..296H
ADC_Keywords: Stars, variable ; Photometry Keywords: Cepheids - stars: variables: other Abstract: The US Naval Observatory 0.2m Flagstaff Astrometric Scanning Transit Telescope (FASTT) was used to obtain astrometric information in 16 equatorial fields in support of the Sloan Digital Sky Survey (SDSS). Each field is approximately 7.6°x3.2° in size and was scanned ∼10 times with overlapping CCD strip scans; star positions accurate to ±50mas in each coordinate and magnitudes good to ±0.011mag were determined. As an ancillary project, this database was searched for new variables, and the results of that search are presented here. Approximately 1500 new variables have been discovered, and accurate coordinates for ∼100 previously identified variables and suspected variables are given. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 99 16 SDSS calibration regions table2.dat 94 1602 Variable stars table3.dat 102 100 Known variable stars
See also: II/214 : General Catalog of Variable Stars, 4th Ed. (GCVS4) (Kholopov+ 1998) Nomenclature Note: The FASTT (Flagstaff Astrometric Scanning Transit Telescope) acronym used in table 2 was proposed by Arne Handen in December 1998. Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- Region Region designation 3- 4 I2 h RA1h Right ascension (J2000.0), lower limit 6- 7 I2 min RA1m Right ascension (J2000.0), lower limit 9- 12 F4.1 s RA1s Right ascension (J2000.0), lower limit 14- 15 I2 h RA2h Right ascension (J2000.0), upper limit 17- 18 I2 min RA2m Right ascension (J2000.0), upper limit 20- 23 F4.1 s RA2s Right ascension (J2000.0), upper limit 25 A1 --- DE1- Declination sign, lower limit 26- 27 I2 deg DE1d Declination (J2000.0), lower limit 29- 30 I2 arcmin DE1m Declination (J2000.0), lower limit 32- 33 I2 arcsec DE1s Declination (J2000.0), lower limit 35- 36 I2 deg DE2d Declination (J2000.0), upper limit 38- 39 I2 arcmin DE2m Declination (J2000.0), upper limit 41- 42 I2 arcsec DE2s Declination (J2000.0), upper limit 44- 46 F3.1 deg Size1 Angular size 48 A1 --- --- [x] 50- 52 F3.1 deg Size2 Angular size 54- 58 I5 --- Nstar Number of stars 60- 65 I6 --- Nobs2 ? Estimated number of stars for full sampling in the four regions with only partial parameters 67- 70 F4.1 mag RFmag Limiting magnitude RF 72- 76 F5.1 deg GLON Galactic longitude 78- 82 F5.1 deg GLAT Galactic latitude 84- 86 F3.1 --- Nobs Mean number photometric observations of each star 88- 90 I3 --- Nvar1 Number of variables found subject from 3σ 92- 94 I3 --- Nvar2 Number of variables found subject from 3σ/FWHM 96- 99 I4 --- Nvar True number of variables found subject
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- FASTT [1,1602]+ Variable number (see "Nomenclature Note" section above) 5 A1 --- n_FASTT [*] *: variable also appears in table3.dat 7- 15 A9 --- SDSS Star designation (ANNNNNNNN) 17- 18 I2 h RAh Right ascension (J2000.0) 20- 21 I2 min RAm Right ascension (J2000.0) 23- 29 F7.4 s RAs Right ascension (J2000.0) 31 A1 --- DE- Declination sign 32- 33 I2 deg DEd Declination (J2000.0) 35- 36 I2 arcmin DEm Declination (J2000.0) 38- 43 F6.3 arcsec DEs Declination (J2000.0) 45- 49 F5.2 mag RFmag Mean RF magnitude 51- 54 F4.2 mag e_RFmag rms uncertainty on RFmag 56- 59 F4.2 --- x/y Ratio of the FWHM in x and y 61- 64 F4.2 --- e_x/y rms uncertainty on x/y 66- 67 I2 --- Nobs Number of times each variable was observed 69- 73 A5 --- Type Classification for the variable 75- 94 A20 --- Note Notes pertaining to the nature of the variability
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 19 A9 --- SDSS Star designation (ANNNNNNNN) 20 A1 --- n_SDSS [*] *: Star does not appear in table2.dat 22- 23 I2 h RAh Right ascension (J2000.0) 25- 26 I2 min RAm Right ascension (J2000.0) 28- 34 F7.4 s RAs Right ascension (J2000.0) 36 A1 --- DE- Declination sign 37- 38 I2 deg DEd Declination (J2000.0) 40- 41 I2 arcmin DEm Declination (J2000.0) 43- 48 F6.3 arcsec DEs Declination (J2000.0) 50- 52 F3.1 arcmin DPos Positional error between the GCVS (Cat. II/139) and FASTT positions 54- 58 A5 --- Type Classification type 60- 64 F5.2 mag magMax ? Maximum magnitude Mag 66- 70 F5.2 mag magMin ? Minimum magnitude Mag 72 A1 --- Mag [VPB] Magnitude filter 74- 78 F5.2 mag RFmag Mean RF magnitude 80- 90 F11.3 d JD ? Epoch of observation 92-102 F11.7 d Per ? Period
History: Copied from electronic Astronomical Journal version
(End) Patricia Bauer [CDS] 10-Mar-1998
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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