Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..591r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 591-603.
Astronomy and Astrophysics
Astronomy
9
Astronomical Catalogs, Early Stars, Galactic Halos, Hubble Space Telescope, Stellar Spectrophotometry, Balmer Series, Classifications, Horizontal Branch Stars, Main Sequence Stars
Scientific paper
The results are reported of an objective-prism survey of stars, mostly earlier than spectral type F5, for two fields at (l;b) = (90 deg and 270 deg; -45 deg). The fields, each of approximately 70 square degrees, are examined on plates taken with the Schmidt Telescope of the Anglo-Australian Observatory. The brightness range of the stars classified is V in the range of 10 to 15. The prism combination used provides a dispersion of 600 A/mm at H-gamma. The spectral classification presented is defined by the equality of equivalent widths of Ca II K and H-delta at type 'F0' and the absence of Ca II K in stars with significant Balmer lines at type 'A0'. Positions listed in the catalog were measured on the Stromlo PDS microdensitometer. Most stars were subsequently identified with objects in the ST ScI-NASA-ESO HST Guide Star Catalog in which positions have an accuracy of near +/- 1.0 arcsec.
Roberts William H.
Rodgers Alexander W.
Walker Ian
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