Results 61 to 70 of about 154,154 (200)

Nuclear Mixing Meters for Classical Novae [PDF]

, 2013
Classical novae are caused by mass transfer episodes from a main sequence star onto a white dwarf via Roche lobe overflow. This material forms an accretion disk around the white dwarf.
Champagne, Art, Downen, Lori, Iliadis, Christian, José, Jordi, Kelly, Keegan J.   +4 more
core   +3 more sources

The mass ratio distribution of short period double degenerate stars [PDF]

, 2002
Short period double degenerates (DDs) are close white dwarf - white dwarf binary stars which are the result of the evolution of interacting binary stars.
Marsh, T. R., Maxted, P. F. L., Moran, C. K. J.   +2 more
core   +2 more sources

Testing White Dwarf Age Estimates Using Wide Double White Dwarf Binaries from Gaia EDR3

The Astrophysical Journal, 2022
White dwarf (WD) stars evolve simply and predictably, making them reliable age indicators. However, self-consistent validation of the methods for determining WD total ages has yet to be widely performed.
Tyler M. Heintz, J. J. Hermes, Kareem El-Badry, Charlie Walsh, Jennifer L. van Saders, C. E. Fields, Detlev Koester   +6 more
doaj   +1 more source

The White Dwarf in EM Cygni: Beyond The Veil

, 2009
We present a spectral analysis of the FUSE spectra of EM Cygni, a Z Cam DN system. The FUSE spectrum, obtained in quiescence, consists of 4 individual exposures (orbits): two exposures, at orbital phases phi ~ 0.65 and phi ~ 0.90, have a lower flux; and ...
Agafonov, Albert P. Linnell, Bailey, Beuermann, Blondin, Bruch, Cannizzo, Edward M. Sion, Godon, Hack, Hamilton, Harrison, Jameson, Kraft, La Dous, Marsh, Morton, Morton, Nevo, Patrick Godon, Paul E. Barrett, Press, Pringle, Sion, Spogli, Spogli, Urban, Verbunt, Wade, Warner, Welsh, Welsh, Winter   +32 more
core   +1 more source

Quiescent nuclear burning in low-metallicity white dwarfs [PDF]

, 2013
We discuss the impact of residual nuclear burning in the cooling sequences of hydrogen-rich DA white dwarfs with very low metallicity progenitors ($Z=0.0001$). These cooling sequences are appropriate for the study of very old stellar populations.
Althaus, Leandro G., Bertolami, Marcelo M. Miller, Garcia-Berro, Enrique   +2 more
core   +3 more sources

Ages of White Dwarf-Red Subdwarf Systems

, 2005
We provide the first age estimates for two recently discovered white dwarf-red subdwarf systems, LHS 193AB and LHS 300AB. These unusual systems provide a new opportunity for linking the reliable age estimates for the white dwarfs to the (measurable ...
Bessel M. S., Hektor Monteiro, John Subasavage, Thom Beaulieu, Todd Henry, Weidemann V., Weidemann V., Weidemann V., Wei‐Chun Jao, Wood M. A.   +9 more
core   +2 more sources

SDSS DR7 WHITE DWARF CATALOG [PDF]

The Astrophysical Journal Supplement Series, 2012
To appear ApJS, January, 2013.
Kleinman, S. J., Kepler, S. O., Koester, D., Pelisoli, Ingrid, Peçanha, Viviane, Nitta, A., Costa, J. E. S., Krzesinski, J., Dufour, P., Lachapelle, F. R., Bergeron, P., Yip, Ching Wa, Harris, Hugh C., Eisenstein, Daniel J., Althaus, Leandro Gabriel, Córsico, Alejandro Hugo   +15 more
openaire   +4 more sources

ϕ-dwarfs: white dwarfs probe quadratically coupled scalars

Journal of High Energy Physics
We study ultralight scalar fields with quadratic couplings to Standard-Model fermions and derive strong constraints from white-dwarf mass-radius data. Such couplings source scalar profiles inside compact stars, shift fermion masses, and can produce a new
Kai Bartnick, Konstantin Springmann, Stefan Stelzl, Andreas Weiler   +3 more
doaj   +1 more source

Measuring the Mass–Radius Relation of White Dwarfs Using Wide Binaries

The Astrophysical Journal
Measuring the mass–radius relation of individual white dwarfs is an empirically challenging task that has been performed for only a few dozen stars. We measure the white dwarf mass–radius relation using the gravitational redshifts and radii of 135 white ...
Stefan Arseneau, Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska, Gautham Adamane Pallathadka, Nicole R. Crumpler, J. J. Hermes, Kareem El-Badry, Hans-Walter Rix, Keivan G. Stassun, Boris T. Gänsicke, Joel R. Brownstein, Sean Morrison   +12 more
doaj   +1 more source

A Proper Motion Survey for White Dwarfs with the Wide Field Planetary Camera 2

, 2002
We have performed a search for halo white dwarfs as high proper motion objects in a second epoch WFPC2 image of the Groth-Westphal strip. We identify 24 high proper motion objects with mu > 0.014 ''/yr.
Baraffe I., C. A. Nelson, C. Alcock, Groth E. J., J. R. Mould, K. H. Cook, Lasserre T., T. S. Axelrod   +7 more
core   +1 more source