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

Abstract

view Abstract Citations (50) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectrophotometry of White Dwarfs as Observed at High Signal-to-Noise Ratio. II. Greenstein, Jesse L. ; Liebert, James W. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1990 DOI: 10.1086/169153 Bibcode: 1990ApJ...360..662G Keywords: Signal To Noise Ratios; Stellar Spectrophotometry; White Dwarf Stars; Balmer Series; Carbon; Charge Coupled Devices; H Alpha Line; Spectral Energy Distribution; Spectral Line Width; Astrophysics; LINE IDENTIFICATIONS; LINE PROFILES; SPECTROPHOTOMETRY; STARS: WHITE DWARFS full text sources ADS | data products SIMBAD (129)