The S201 far-ultraviolet imaging survey. I - Two fields at high galactic latitude

Details The S201 far-ultraviolet imaging survey. I - Two fields at high galactic latitude The S201 far-ultraviolet imaging survey. I - Two fields at high galactic latitude

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...53..623c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 53, Nov. 1983, p. 623-642. NASA-supported research.

Astronomy and Astrophysics

Astronomy

13

Astronomical Photography, Early Stars, Milky Way Galaxy, Star Distribution, Ultraviolet Astronomy, A Stars, Astronomical Coordinates, Astronomical Maps, B Stars, Far Ultraviolet Radiation, Hot Stars, Stellar Magnitude, Stellar Radiation, Ultraviolet Photography

Scientific paper

Far-ultraviolet imagery was obtained of 10 20-deg diameter fields by the S201 far-ultraviolet camera during the Apollo 16 mission. The present discussion is of two high galactic latitude fields, in Grus and Aquarius, in which exposures of up to 30 minutes duration were obtained in the 1250-1600 A wavelength range (effective wavelength 1400 A), and in which objects as faint as m(1400) = 11.8 are detected. The number versus magnitude relation for the observed objects appears to peak near m(1400) = 10, implying that relatively few such objects exist at magnitudes fainter than our sensitivity limit. Most of the stellar contribution to the ultraviolet radiation field is contributed by stars brighter than m(1400) = 6, which are mainly nearby late B and early A members of the galactic disk population. The objects fainter than m(1400) = 8, however, appear to be members of a second population of hot, subluminous objects, but further ground-based observations of these objects are needed.

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