UV Spectrophotometry of the Hottest Stars from the Southern HK Survey

Details UV Spectrophotometry of the Hottest Stars from the Southern HK Survey UV Spectrophotometry of the Hottest Stars from the Southern HK Survey

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446l..27d&link_type=abstract

Astrophysical Journal Letters v.446, p.L27

Astronomy and Astrophysics

Astronomy

5

Ultraviolet: Stars, Stars: Subdwarfs

Scientific paper

Low-resolution UV spectra have been obtained with the long- and short-wavelength lUE cameras for seven of the hottest stars identified in the ongoing HK objective-prism/interference-filter survey begun by Beers, Preston, & Shectman. These stars are a subset of a sample of some 25,000 stars at high galactic latitude whose objective-prism spectra indicate that they are hotter than the Population II main-sequence turnoff in the magnitude range 11 ≤ B ≤ 15.5. The UV fluxes have been corrected for interstellar reddening using a standard reddening law, and comparison of the integrated fluxes in the two lUE cameras indicates that the effective temperatures of these stars range from 40,000 K to 80,000 K. The UV absorption spectra of six of the seven stars are characterized by a strong He II λ1640 line and 3-n series of He II. Five of these stars show strong C IV λ1550 absorption. The low-resolution UV spectrum of the remaining object is featureless.

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