scholarly journals TheEUVEOptical Identification Campaign II: Late-Type and White Dwarf Stars

1996 ◽  
Vol 152 ◽  
pp. 491-496
Author(s):  
N. Craig ◽  
A. Fruscione ◽  
J. Dupuis ◽  
M. Mathioudakis ◽  
J.J. Drake ◽  
...  
Keyword(s):  
White Dwarf ◽  
Extreme Ultraviolet ◽  
Late Type ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Deep Survey ◽  
Balmer Lines ◽  
Optical Identifications ◽  
Error Circle

We present optical identifications of nine previously unidentified extreme ultraviolet (EUV) sources discovered during theExtreme Ultraviolet Explorer(EUVE) satellite surveys. The all-sky survey detected four of the sources and the more sensitive deep survey detected the other five sources. Three of the four all-sky survey sources, EUVE_J1918+59.9, EUVE_J2249+58.5, and EUVE_J2329+41.4, are listed in present catalogs as having possible associations with optical counterparts but without spectral class. The first two of these sources are hot DA white dwarfs showing an optical spectrum with broad Balmer lines. The source EUVE_J2329+41.4 is listed as having a possible association with an unclassified M star. We show that a pair of dMe stars are actually optical counterparts located within the error circle of theEUVEsource position. The EUVE_J2114+503 remains unidentified even though all the possible candidates have been studied. Based on the count rates we predict a fainter white dwarf or a cataclysmic variable counterpart for this candidate. All five sources discovered with theEUVEdeep survey, EUVE_J0318+184, EUVE_J0419+217, EUVE_J2053−175, EUVE_J2056−171 and EUVE_J2233−096, have been identified as late-type stars. The spectral classes, distances, visual magnitudes, and estimated hydrogen column densities for theseEUVEsources are presented.

scholarly journals White Dwarf Stars

2017 ◽  
Vol 45 ◽  
pp. 1760023
Author(s):  
S. O. Kepler ◽  
Alejandra Daniela Romero ◽  
Ingrid Pelisoli ◽  
Gustavo Ourique
Keyword(s):  
White Dwarf ◽  
Final Stage ◽  
White Dwarfs ◽  
Sloan Digital Sky Survey ◽  
Dwarf Stars ◽  
Multiple Systems ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Data Release ◽  
Low Mass

White dwarf stars are the final stage of most stars, born single or in multiple systems. We discuss the identification, magnetic fields, and mass distribution for white dwarfs detected from spectra obtained by the Sloan Digital Sky Survey up to Data Release 13 in 2016, which lead to the increase in the number of spectroscopically identified white dwarf stars from 5[Formula: see text]000 to 39[Formula: see text]000. This number includes only white dwarf stars with [Formula: see text], i.e., excluding the Extremely Low Mass white dwarfs, which are necessarily the byproduct of stellar interaction.

scholarly journals Cool Companions to White Dwarf Stars from the Two Micron All Sky Survey All Sky Data Release

2007 ◽  
Vol 134 (1) ◽  
pp. 26-42 ◽  
Author(s):  
D. W. Hoard ◽  
S. Wachter ◽  
Laura K. Sturch ◽  
Allison M. Widhalm ◽  
Kevin P. Weiler ◽  
...  
Keyword(s):  
White Dwarf ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Data Release

scholarly journals White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14

2019 ◽  
Vol 486 (2) ◽  
pp. 2169-2183 ◽  
Author(s):  
S O Kepler ◽  
Ingrid Pelisoli ◽  
Detlev Koester ◽  
Nicole Reindl ◽  
Stephan Geier ◽  
...  
Keyword(s):  
Survey Data ◽  
White Dwarf ◽  
White Dwarfs ◽  
Main Sequence ◽  
Sloan Digital Sky Survey ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Data Release ◽  
Hot Subdwarfs

ABSTRACT White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population. Examining the spectra of all stars with 3σ proper motion in the Sloan Digital Sky Survey Data Release 14, we report the classification for 20 088 spectroscopically confirmed white dwarfs, plus 415 hot subdwarfs, and 311 cataclysmic variables. We obtain Teff, log  g, and mass for hydrogen atmosphere white dwarf stars (DAs), warm helium atmosphere white dwarfs (DBs), hot subdwarfs (sdBs and sdOs), and estimate photometric Teff for white dwarf stars with continuum spectra (DCs). We find 15 793 sdAs and 447 dCs between the white dwarf cooling sequence and the main sequence, especially below $T_\mathrm{eff}\simeq 10\, 000$ K; most are likely low-mass metal-poor main-sequence stars, but some could be the result of interacting binary evolution.

The EUVE Optical Identification Campaign II: Late-Type and White Dwarf Stars

1995 ◽  
Vol 110 ◽  
pp. 1304 ◽  
Author(s):  
N. Craig ◽  
A. Fruscione ◽  
J. Dupuis ◽  
M. Mathioudakis ◽  
J. J. Drake ◽  
...  
Keyword(s):  
White Dwarf ◽  
Late Type ◽  
Optical Identification ◽  
Dwarf Stars ◽  
White Dwarf Stars

scholarly journals A Catalog of Spectroscopically Identified White Dwarf Stars in the First Data Release of the Sloan Digital Sky Survey

2004 ◽  
Vol 607 (1) ◽  
pp. 426-444 ◽  
Author(s):  
S. J. Kleinman ◽  
Hugh C. Harris ◽  
Daniel J. Eisenstein ◽  
James Liebert ◽  
Atsuko Nitta ◽  
...  
Keyword(s):  
White Dwarf ◽  
Sloan Digital Sky Survey ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Data Release

scholarly journals New white dwarf stars in the Sloan Digital Sky Survey Data Release 10

2014 ◽  
Vol 446 (4) ◽  
pp. 4078-4087 ◽  
Author(s):  
S. O. Kepler ◽  
I. Pelisoli ◽  
D. Koester ◽  
G. Ourique ◽  
S. J. Kleinman ◽  
...  
Keyword(s):  
Survey Data ◽  
White Dwarf ◽  
Sloan Digital Sky Survey ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Data Release

White Dwarf Stars in the Sloan Digital SKY Survey: Photometry

White Dwarfs ◽  
2003 ◽  
pp. 391-392
Author(s):  
S. J. Kleinman ◽  
T. Takato ◽  
A. Nitta ◽  
J. Krzesinski
Keyword(s):  
White Dwarf ◽  
Sloan Digital Sky Survey ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sky Survey

The EUVE Optical Identification Campaign II: Late-Type and White Dwarf Stars

1996 ◽  
pp. 491-496
Author(s):  
N. Craig ◽  
A. Fruscione ◽  
J. Dupuis ◽  
M. Mathioudakis ◽  
J. J. Drake ◽  
...  
Keyword(s):  
White Dwarf ◽  
Late Type ◽  
Optical Identification ◽  
Dwarf Stars ◽  
White Dwarf Stars

scholarly journals Spectra of White-Dwarf Stars at Wavelengths < 3000 A: A Theoretical Perspective

1979 ◽  
Vol 53 ◽  
pp. 86-106 ◽  
Author(s):  
Harry L. Shipman
Keyword(s):  
Solar System ◽  
White Dwarf ◽  
Extreme Ultraviolet ◽  
Theoretical Perspective ◽  
Electromagnetic Spectrum ◽  
Dwarf Stars ◽  
X Ray ◽  
Satellite Technology ◽  
White Dwarf Stars ◽  
Current State

Astronomers studying objects outside the solar system first used the ultraviolet, extreme ultraviolet, and x-ray regions of the electromagnetic spectrum in the 1970s. The exploration of these wavelength regions has produced considerable improvements in our understanding of these objects. The achievements of x-ray astronomy are perhaps the best known. With the advance of satellite technology, other wavelength regions begin to play a role, and x-ray astronomy moves into the luminosity domain where quiescent as well as violent astrophysical processes can produce detectable amounts of radiation. This paper reviews the current state of our interpretation of white-dwarf stars at wavelengths less than 3000 A.

Sign in / Sign up

Export Citation Format

Share Document