/ftp/cats/aliases/G//GD



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II/299       GD blue stars from Lowell proper motion survey  (Giclas+ 1980)
The following files can be converted to FITS (extension .fit or fit.gz)
	gd.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=II/299
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Beginning of ReadMe : II/299 GD blue stars from Lowell proper motion survey (Giclas+ 1980) ================================================================================ Summary catalog of GD and GR stars Giclas H.L., Burnham R., Thomas N.G. <Lowell Obs. Bull. 8, 157 (1980)> =1980LowOB...8..157G ================================================================================ ADC_Keywords: Stars, blue ; Stars, white dwarf ; Proper motions Introduction: A summary catalog listing 1712 white dwarf suspects and 504 very red stars all with proper motions less than 0.20arcsec/year is presented. The proper motion is given in seconds of arc per year for motion greater than 0.06arcsec/year. Motion 0.06 sec/year or less is designated slight; and the position angle is rounded to the nearest 5 degrees. Motion 0.03 sec/year or less is also indicated. Estimates of the blue magnitude, star colors, photometry, and spectral type (if determined) are given. Description (from B. Skiff): This list shows precise coordinates, mostly for epoch and equinox J2000, for the 1712 GD stars. These were blue stars of small motion found during the Lowell proper motion survey. The stars include substantial numbers of white dwarfs (the intended objects), but at least half are other sorts of blue stars: hot subdwarfs, blue horizontal-branch stars, metal-poor dwarfs as late as K0 --- and doubtless many ordinary F/G stars, and finally a few active galaxies. Some hundreds of the stars are missing from SIMBAD, or appear with approximate coordinates. I thus examined every object by comparing the Lowell finder charts with cut-outs of the DSS, SDSS, and 2MASS images using the Goddard SkyView utility. I obtained 'best' positions using VizieR; these were drawn from a variety of sources, indicated by a single-letter code following each position, and outlined in the Note below. Many of the same sources provided at least 'pretty good' V magnitudes, but I adopted photoelectric/CCD observations when available, and also used the ASAS-3 and TASS MkIV databases. The intent here is to remove whatever systematic problems there are in the source magnitudes down to the  0.1 mag level, not to provide accurate photometry.