Spectrophotometry of white dwarfs as observed at high signal-to-noise ratio. II

Details Spectrophotometry of white dwarfs as observed at high signal-to-noise ratio. II Spectrophotometry of white dwarfs as observed at high signal-to-noise ratio. II

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..662g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 662-684.

Astronomy and Astrophysics

Astrophysics

47

Signal To Noise Ratios, Stellar Spectrophotometry, White Dwarf Stars, Balmer Series, Carbon, Charge Coupled Devices, H Alpha Line, Spectral Energy Distribution, Spectral Line Width

Scientific paper

CCD spectrophotometry is presented of 140 white dwarfs at high SNR and is analyzed in detail. Energy distributions at 14,000 A are given at bandpasses from 3571 to 8300 A, and equivalent widths of lines of H, He I, metals, and atomic and molecular carbon are given as functions of color for DB, DQ, DZ, and DA stars. New forbidden H I transitions at 6068 A and 6632 A are found in at least the two hottest DB stars, new metallic features are found in cooler DZ stars, and the presence of Ca I in vMa 2 is confirmed. The spectrum of the hot DQAB star G227 - 5 and the pressure-shifted carbon bands seen in 0038-226 are discussed in detail. Comparison of the optical energy distribution of the latter with published IR fluxes shows that the 1-2 micron region is strongly depressed, with extensive blanketing. Equivalent widths, central depths, and width parameters are presented for H-alpha in 73 DA stars in the sample, and their dependences on color are studied.

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