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J/A+A/419/167    BVRI photometry in metal-poor binaries (Zapatero Osorio+, 2004)

A CCD imaging search for wide metal-poor binaries. Zapatero Osorio M.R., Martin E.L. <Astron. Astrophys. 419, 167 (2004)> =2004A&A...419..167Z
ADC_Keywords: Stars, double and multiple ; Photometry, UBVRI Keywords: stars: subdwarfs - binaries: visual - stars: late-type - stars: statistics Abstract: We explored the regions within a radius of 25 arcsec around 473 nearby, low-metallicity G- to M-type stars using (VR)I optical filters and small-aperture telescopes. About 10% of the sample was searched up to angular separations of 90 arcsec. We applied photometric and astrometric techniques to detect true physical companions to the targets. The great majority of the sample stars was drawn from the Carney-Latham surveys; their metallicities range from roughly solar to [Fe/H]=-3.5dex. Our I-band photometric survey detected objects that are between 0 and 5mag fainter (completeness) than the target stars; the maximum dynamical range of our exploration is 9mag. Description: Observing dates, differential photometry and astrometry (rho and position angle) of companion candidates around 473 nearby, low-metallicity G- to M-type stars are provided in the Table. The target stars were mainly taken from the Carney-Latham surveys. Also provided are exposure times, the FWHM of the CCD images, and the telescope used for collecting the observations. The last column contains a flag indicating whether the candidate is a confirmed physical companion. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 101 1391 Photometric and astrometric observations notes.dat 80 55 Individual notes
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Name of the target star 11 A1 --- n_Name [*] note detailed in "notes.dat"" file 13- 18 F6.3 mag Vmag ? V magnitude of the target star 21 A1 --- Filter Filter (BVRI) 24- 34 A11 --- Tel Telescope 35- 38 I4 s ExpTime ? Exposure time 42- 45 F4.1 arcsec FWHM ? FWHM 53- 62 A10 "DD/MM/YYYY" Obsdate Observing date (1) 64 A1 --- l_rho Limit flag on rho 65- 70 F6.2 arcsec rho ? Angular separation of companion 71- 72 A2 --- u_rho [ :] Uncertainty flag on rho 76- 81 F6.2 deg PA ? Position angle of companion (2) 82- 83 A2 --- u_PA [ :] Uncertainty flag on PA 85 A1 --- l_Dmag Limit flag on Dmag 86- 90 F5.2 mag Dmag ? Differential magnitude (3) 91- 92 A2 --- u_Dmag [ :] Uncertainty flag on Dmag 94-101 A8 --- Notes Notes (4)
Note (1): The years of the observations correspond to the interval 1991-2004. Note (2): Measured toward the east of north. Note (3): Differential magnitude of the candidate companion with respect to the target star. Note (4): The flags are: 1 = No common proper motion companion after comparison with POSS2 red plates. 2 = No "color" companion. 3 = No proper motion companion. 4 = Previously known common proper motion companion. 5 = Newly identified common proper motion companion.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Name of the target star 12- 80 A69 --- Note Note
Acknowledgements: Maria Rosa Zapatero Osorio
(End) Maria Rosa Zapatero Osorio [LAEFF-INTA, Spain] 27-Apr-2004
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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