Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........26d&link_type=abstract
Thesis (PH.D.)--DARTMOUTH COLLEGE, 1994.Source: Dissertation Abstracts International, Volume: 56-04, Section: B, page: 2075.
Computer Science
5
Scientific paper
Spectral types for 356 of the 1,186 objects comprising the Kiso Ultraviolet Excess (KUV) Survey are reported. Observations of 277 KUV objects were made at the Michigan-Dartmouth -MIT Observatory on Kitt Peak, using both the 2.4 meter Hiltner and 1.3 meter McGraw-Hill telescopes. Interesting objects reported include: 70 subdwarfs, 33 DA, 6 DQ and 3 DB white dwarfs, and 95 QSO and emission line objects. A search through the literature has revealed the spectral identification of an additional 79 KUV objects. This brings the total identified to 1,115 (94%), including samples of 234 white dwarfs and 170 quasars. The V/Vmax technique (Schmidt 1968) was applied to the complete samples of white dwarfs and quasars to estimate the limiting magnitude of the KUV Survey and construct luminosity functions of these populations. The limiting magnitude was estimated to be 17.35 from the KUV white dwarfs and 17.81 from the KUV quasars. Theoretical white dwarf luminosity functions (WDLF) are used with the observational WDLF determined in this work to estimate the age of the Galactic disc at our galactocentric radius to be between 8.0 Gyr and 110 Gyr, with 9.0 Gyr being the best estimate. If 1.0 Gyr is chosen as the interval between the creation event and star formation in the Galactic disc (Winget et al. 1987), the age of the universe is then estimated to be 10.0 Gyr. The deeper KUV Survey has be used to analyze the completeness of the Palomar-Green (PG) Survey. If completeness is defined by the number of KUV objects located in the overlapping area of the surveys, and brighter than their PG field's limiting magnitude, compared to the number of these KUV objects actually detected by the PG, then an estimate of completeness based on spectral type for the PG is: 57% for quasars, 58% for white dwarfs and 53% for all objects. Limits on the selection function of the PG are calculated, and the PG is determined to be approximately 75% complete out to between 15.15 and 16.15 magnitude where it falls substantially incomplete.
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