Results 11 to 20 of about 73,292 (294)

Low Luminosity Companions to White Dwarfs [PDF]

, 2005
This paper presents results of a near-infrared imaging survey for low mass stellar and substellar companions to white dwarfs. A wide field proper motion survey of 261 white dwarfs was capable of directly detecting companions at orbital separations ...
Alexander J., B. Zuckerman, Bouvier J., Duquennoy A., E. E. Becklin, Eggen O., Heber U., Hog E., Homeier D., J. Farihi, Livio M., Low C., Marsh M., Marsh T., Marsh T., Maxted P., Perryman M., Weidemann V., Weidemann V., Weidemann V., Wielen R.   +20 more
core   +4 more sources

Isochrones and Luminosity Functions for Old White Dwarfs [PDF]

, 1999
Using a new grid of models of cooling white dwarfs, we calculate isochrones and luminosity functions in the Johnson-Kron/Cousins and HST filter sets for systems containing old white dwarfs.
Alessandro Chieffi, Brad Hansen, Chabrier G., Gregory G. Fahlman, Harvey B. Richer, Larson R. B., Marco Limongi, Oscar Straniero, Piotto G., Renault C.   +9 more
core   +2 more sources

The White Dwarfs within 25 Parsecs of the Sun: Kinematics and Spectroscopic Subtypes [PDF]

, 2014
We present the fractional distribution of spectroscopic subtypes, range and distribution of surface temperatures, and kinematical properties of the white dwarfs within 25pc of the sun.
Holberg, J. B., McCook, G. P., Myszka, J., Oswalt, T. D., Sion, E. M., Wasatonic, R.   +5 more
core   +4 more sources

Accreting White Dwarfs

, 2022
48 pages, 6 figures, Invited (and accepted) chapter for the Handbook of X-ray and Gamma-ray Astrophysics, Editors: Cosimo Bambi, Andrea ...
openaire   +2 more sources

White Dwarf and Pre-White Dwarf Oscillations [PDF]

International Astronomical Union Colloquium, 1993
AbstractCompact stars that result from extreme mass loss on the asymptotic giant branch and planetary nebula formation are observed to pulsate in a very large surface effective temperature range as they cool to become the classical white dwarfs. The hottest and most luminous of these display periods in excess of 1000 seconds because they are large, but
openaire   +1 more source

Magnetic White Dwarfs [PDF]

, 2015
In this paper we review the current status of research on the observational and theoretical characteristics of isolated and binary magnetic white dwarfs (MWDs). Magnetic fields of isolated MWDs are observed to lie in the range 10^3-10^9G.
de Martino, Domitilla, Ferrario, Lilia, Gaensicke, Boris   +2 more
core   +2 more sources

Near-Infrared Constraints on the Presence of Warm Dust at Metal-Rich, Helium Atmosphere White Dwarfs [PDF]

, 2008
Here, we present near-infrared spectroscopic observations of 15 helium atmosphere, metal-rich white dwarfs obtained at the NASA Infrared Telescope Facility.
Atsuko Nitta, Burleigh, Debes, Debes, Debes, Farihi, Farihi, Friedrich, Friedrich, Friedrich, Gianninas, Gänsicke, J. Farihi, Koester, Koester, Laws, McCarthy, Mukremin Kilic, Nelemans, S. K. Leggett, Schatzman, Weidemann, Williams   +22 more
core   +3 more sources

The Possible White Dwarf-Neutron Star Connection [PDF]

, 1997
The current status of the problem of whether neutron stars can form, in close binary systems, by accretion-induced collapse (AIC) of white dwarfs is examined. We find that, in principle, both initially cold C+O white dwarfs in the high-mass tail of their
C Ritossa, D García, E García-Berro, EPJ Heuvel van den, EPJ Heuvel van den, F Verbunt, FS Timmes, I Domínguez, I Domínguez, J Gutiérrez, J Gutiérrez, J Isern, J Isern, J Isern, K Nomoto, K Nomoto, M Hernanz, R Canal, R Canal, R Canal, R Canal, R Canal, R Canal, R Mochkovitch, R Mochkovitch, S Miyaji, S Miyaji, SE Woosley   +27 more
core   +2 more sources

Spectroscopic analysis of DA white dwarfs from the McCook & Sion catalog [PDF]

, 2008
For some years now, we have been gathering optical spectra of DA white dwarfs in an effort to study and define the empirical ZZ Ceti instability strip. However, we have recently expanded this survey to include all the DA white dwarfs in the McCook & Sion
A Gianninas, Bergeron P Gianninas A, Bergeron P Saffer R, Bochanski J J, Eisenstein, Gianninas A Bergeron P, Liebert J Bergeron P, M T Ruiz, McCook G P, Napiwotzki R, Napiwotzki R, P Bergeron, Vanlandingham K M, Werner K   +13 more
core   +1 more source

Magnetic white dwarfs in the Early Data Release of the Sloan Digital Sky Survey [PDF]

, 2002
We have identified 7 new magnetic DA white dwarfs in the Early Data Release of the Sloan Digital Sky Survey. Our selection strategy has also recovered all the previously known magnetic white dwarfs contained in the SDSS EDR, KUV03292+0035 and HE0330-0002.
Euchner, F., Gaensicke, B. T., Jordan, S.   +2 more
core   +3 more sources