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J/AJ/134/778        BVRI photometry of candidate subdwarfs   (Marshall, 2007)

Mapping the local galactic halo. I. Optical photometry of cool subdwarf candidates. Marshall J.L. <Astron. J., 134, 778-786 (2007)> =2007AJ....134..778M
ADC_Keywords: Photometry, UBVRI ; Stars, subdwarf Keywords: Galaxy: halo - solar neighborhood - stars: late-type - subdwarfs Abstract: Optical (BVRI) photometric measurements of a sample of 564 candidate cool subdwarfs in the nearby halo are presented. The stars generally span the color range 0.4<(B-V)<1.8; hence, the sample is composed of early F- through early M-type stars on the subdwarf sequence. The sample is selected from the revised NLTT catalog of Gould and Salim and Salim and Gould via a reduced proper motion diagram. The photometry is precise and accurate; in particular, for stars with 9<V<13.5 the photometry is accurate to 0.013, 0.015, 0.012, and 0.013mag in V, B-V, V-R, and V-I, respectively. For stars with 13.5<V<16 the photometry is accurate to 0.022, 0.018, 0.013, and 0.018mag in the same bands. Description: Photometric observations were obtained at the Cerro-Tololo Inter-American Observatory (CTIO) on the 0.9m telescope during 2003 and on the 1.0m telescope in 2004, and at the MDM Observatory 1.3m telescope during 2003 and 2004. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 564 BVRI photometry of candidate subdwarfs
See also: I/98 : NLTT Catalogue (Luyten, 1979) J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003) J/AJ/98/1693 : UBVRI photometry of NLTT stars (Ryan 1989) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- NLTT The NLTT identification number 7- 8 I2 h RAh Hour of Right Ascension (J2000) 10- 11 I2 min RAm Minute of Right Ascension (J2000) 13- 16 F4.1 s RAs Second of Right Ascension (J2000) 18 A1 --- DE- Sign of the Declination (J2000) 19- 20 I2 deg DEd Degree of Declination (J2000) 22- 23 I2 arcmin DEm Arcminute of Declination (J2000) 25- 26 I2 arcsec DEs Arcsecond of Declination (J2000) 28- 33 F6.3 mag Vmag The V band magnitude 35- 39 F5.3 mag B-V The (B-V) color index 41- 45 F5.3 mag V-R The (V-R) color index 47- 51 F5.3 mag V-I The (V-I) color index 53- 57 F5.3 mag V-J The (V-J) color index 59- 64 F6.3 mag V-H The (V-H) color index 66- 70 F5.3 mag V-K The (V-K) color index 72 I1 --- o_NLTT Number of observations of NLTT 74 I1 --- n_NLTT [1/2]? Possible variability (1)
Note (1): Note on NLTT as follows: 1 = Star may be variable or have large photometric errors, due to large standard deviation (>0.08mag) between multiple measurements 2 = Star may be variable or have large photometric errors, due to large discrepancy with Hipparcos photometry
History: * 10-Nov-2009: From electronic version of the journal * 01-Feb-2010: Declination sign corrected for NLLT 46798
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 30-Sep-2009
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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