Results 61 to 70 of about 1,989,293 (378)

White dwarfs in the WTS: Eclipsing binaries

EPJ Web of Conferences, 2013
We have identified photometric white dwarf candidates in the WFCAM transit survey through a reduced proper motion versus colour approach. Box-fitting with parameters adjusted to detect the unique signature of a white dwarf + planet/brown dwarf transit ...
Burleigh M.R., Koppenhoefer J., Saglia R.P., Steele P.R., Cappetta M.   +4 more
doaj   +1 more source

Cooling Process of White Dwarf Stars in Palatini f(R) Gravity

Universe, 2022
A simple cooling model of white dwarf stars is re-analyzed in Palatini f(R) gravity. Modified gravity affects the white dwarf structures and consequently their ages.
Surajit Kalita, Lupamudra Sarmah, Aneta Wojnar   +2 more
doaj   +1 more source

The Temperatures of White Dwarfs in Dwarf Novae [PDF]

International Astronomical Union Colloquium, 1996
AbstractWe attempt to measure the temperature of all the quiescent dwarf novae that have been observed with IUE, by fitting the observed flux distribution of white dwarfs (WDs) with known temperatures. This approach gives results similar to those using much more sophisticated modelling, but allows us to investigate the relationship with system ...
C. La Dous, B. J. M. Hassall
openaire   +2 more sources

White-Dwarf Asteroseismology With the Kepler Space Telescope

Frontiers in Astronomy and Space Sciences, 2020
In the course of their evolution, white-dwarf stars go through at least one phase of variability in which the global pulsations they undergo allow astronomers to peer into their interiors, making it possible to shed light on their deep inner structure ...
Alejandro H. Córsico, Alejandro H. Córsico   +1 more
doaj   +1 more source

Sub-Chandrasekhar-mass White Dwarf Detonations Revisited [PDF]

, 2017
The detonation of a sub-Chandrasekhar-mass white dwarf (WD) has emerged as one of the most promising Type Ia supernova (SN Ia) progenitor scenarios. Recent studies have suggested that the rapid transfer of a very small amount of helium from one WD to ...
K. Shen, D. Kasen, Broxton J. Miles, D. Townsley   +3 more
semanticscholar   +1 more source

A refined search for pulsations in white dwarf companions to millisecond pulsars★ [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We present optical high-speed photometry of three millisecond pulsars with low-mass ($< 0.3 M_{\odot}$) white dwarf companions, bringing the total number of such systems with follow-up time-series photometry to five.
M. Kilic, J. Hermes, A. Córsico, A. Kosakowski, Warren R. Brown, J. Antoniadis, L. M. Calcaferro, A. Gianninas, L. Althaus, M. Green   +9 more
semanticscholar   +1 more source

Hot white dwarfs and pre-white dwarfs discovered with SALT

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT The Southern African Large Telescope survey of helium-rich hot subdwarfs aims to explore evolutionary pathways among groups of highly evolved stars. The selection criteria mean that several hot white dwarfs and related objects have also been included.
C S Jeffery, K Werner, D Kilkenny, B Miszalski, I Monageng, E J Snowdon   +5 more
openaire   +3 more sources

The Highly Accurate Relation Between the Radius and Mass of the White Dwarf Star From Zero to Finite Temperature

Frontiers in Astronomy and Space Sciences, 2022
In this research, first considering the electron–electron interaction in the high-density Fermi electron gas at T = 0 K, this interaction causes the pressure 2/137 time less than the original value.
Ting-Hang Pei
doaj   +1 more source

A precision study of two eclipsing white dwarf plus M dwarf binaries [PDF]

, 2011
We use a combination of X-shooter spectroscopy, ULTRACAM high-speed photometry and SOFI near-infrared photometry to measure the masses and radii of both components of the eclipsing post common envelope binaries SDSS J1212-0123 and GK Vir.
A. D. Schwope, A. Nebot Gómez-Morán, A. Rebassa-Mansergas, Althaus, Andersen, Applegate, B. T. Gänsicke, Baraffe, Barstow, Bayless, Benvenuto, Berger, Beuermann, Brinkworth, Brown, C. D. J. Savoury, C. M. Copperwheat, C. Tappert, Carter, Casewell, Chabrier, Claret, Copperwheat, D. Koester, Debes, Dhillon, Driebe, D’Odorico, Fulbright, Green, Green, Hameury, Hamuy, Han, Hawley, Knigge, Koester, Koester, Kraus, L. Schmidtobreick, Littlefair, López-Morales, M. R. Burleigh, M. R. Schreiber, Maxted, Moorwood, Morales, Morales, Nebot, O’Brien, P. Kerry, P. R. Steele, Panei, Parsons, Parsons, Parsons, Prada, Press, Provencal, Provencal, Pyrzas, R. D. G. Hickman, Rebassa-Mansergas, Rebassa-Mansergas, Renzini, Ribas, Richards, Ritter, S. G. Parsons, S. P. Littlefair, S. Pyrzas, Sarna, Savoury, Shen, Silvestri, Sirotkin, Skrutskie, Smith, Southworth, Southworth, Steinfadt, T. R. Marsh, Tappert, Torres, Torres, V. S. Dhillon, Vennes, Vennes, Willems, Wood   +89 more
core   +2 more sources

Binary Star Orbits. V. The Nearby White Dwarf/Red Dwarf Pair 40 Eri BC [PDF]

, 2017
A new relative orbit solution with new dynamical masses is determined for the nearby white dwarf–red dwarf pair 40 Eri BC. The period is 230.29 ± 0.68 years.
B. Mason, W. Hartkopf, Korie N. Miles
semanticscholar   +1 more source