Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (46) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (127)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Spectrophotometry of white dwarfs as observed at high signal-to-noise ratio. II
Authors:
Greenstein, Jesse L.; Liebert, James W.
Affiliation:
AA(Palomar Observatory; California Institute of Technology, Pasadena), AB(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 662-684. (ApJ Homepage)
Publication Date:
09/1990
Category:
Astrophysics
Origin:
STI
NASA/STI 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
DOI:
10.1086/169153
Bibliographic Code:
1990ApJ...360..662G

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.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints