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J/AJ/115/296 SDSS new variables (Henden+ 1998)
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New variables in the Sloan Digital Sky Survey calibration fields.
Henden A.A., Stone R.C.
<Astron. J. 115, 296 (1998)>
=1998AJ....115..296H
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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{deg}x3.2{deg} 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 16 SDSS calibration regions
table2.dat 86 1602 Variable stars
table3.dat 102 100 Known variable stars
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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
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Bytes Format Units Label Explanations
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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 R_F_
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 3{sigma}
92- 94 I3 --- Nvar2 Number of variables found subject
from 3{sigma}/FWHM
96- 99 I4 --- Nvar True number of variables found subject
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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 R_F_ 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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 R_F_ magnitude
80- 90 F11.3 d JD ? Epoch of observation
92-102 F11.7 d Per ? Period
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History: Copied from electronic Astronomical Journal version
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(End) Patricia Bauer [CDS] 10-Mar-1998