========================================================================== J/ApJS/61/569 KPD UV-excess objects (Downes+, 1986) The following files can be converted to FITS (extension .fit or fit.gz) kpd.dat ========================================================================== Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/61/569 ==========================================================================
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Beginning of ReadMe : J/ApJS/61/569 KPD UV-excess objects (Downes+, 1986) ================================================================================ The KPD survey for galactic plane ultraviolet-excess objects: space densities of white dwarfs and subdwarfs. Downes R.A. <Astrophys. J. Suppl. Ser., 61, 569-584 (1986)> =1986ApJS...61..569D ================================================================================ ADC_Keywords: Stars, white dwarf ; Stars, subdwarf ; Spectral types; Photometry, UBV Keywords: stars: faint blue ; stars: stellar statistics ; stars: subdwarfs ; stars: white dwarfs Abstract: A survey for ultraviolet-excess objects has been performed for over about 1000sq.deg of the Galactic plane. Photographic blue and ultraviolet plates were obtained to select ultraviolet-excess candidates, and spectroscopic observations were used to determine the nature of those objects. Over 70 white dwarfs and subdwarfs were identified from the survey plates, and these objects were analyzed statistically to determine scale heights and space densities. The sample was complete to B=15.3mag, with the space density of white dwarfs for Mv<12.25 equal to 0.72+/-0.25 per 1000pc^3^, slightly higher than that from the Palomar-Green survey. The average absolute magnitude determined for both the subdwarf O and the subdwarf B stars was considerably fainter than previous determinations, while the scale height for the subdwarfs was lower than earlier suggested values. The space density for the subdwarf O stars is about 7x10^-7^pc^-3^, while the value for the subdwarf B stars is about 2x10^-6^pc^-3, both values considerably higher than previous estimates. The space densities can be used to place evolutionary constraints on these objects. Description: The Kitt Peak-Downes (KPD) survey consists of 3 parts: * photographic data obtained between 1981 July and 1983 July with the 0.6m Warner and Swasey Burrell Schmidt telescope at Kitt Peak, on IIa-O plates with a Schott UG-2 filter for the ultraviolet plates and a Schott UG-2 filter for the blue plates, the same filters used for the PG survey (Green et al. Cat. II/207). The collection is made of 52 plate pairs in regions within 12deg of the Galactic plane with declination < 60deg * spectroscopic observations of the UV-excess candidates were obtained on the Mount Lemmon UCSD/Minnesota 1.5m telescope equipped with the Robinson-Wampler image-tube scanner, with a low-resolution grating of about 15AA in the 4000-6800AA range. * photoelectric photometry was obtained with the 1.3m telescope at Kitt Peak with the Mark II photometer. The original semi-accurate positions scatter by typically 30" to 60"; most of the stars have charts, and the accurate positions were derived by B. Skiff (Lowell Obs.) in 2009 April.