Results 41 to 50 of about 2,034,344 (399)

White Dwarfs [PDF]

International Astronomical Union Colloquium, 1994
It is the intention of this review to explain what white dwarfs are and why it is interesting to study them, and why the H+2 molecule is of special interest. The evolution, from start to finish, of a star of mass less than about 2 solar masses (M⊙), can roughly be summarized as follows: – A cloud of gas contracts from the interstellar ...
openaire   +1 more source

White Dwarf Crystallization [PDF]

International Astronomical Union Colloquium, 1994
AbstractThe inclusion of a detailed treatment of solidification processes in the cooling theory of carbon–oxygen white dwarfs is of crucial importance for the determination of their luminosity function. Carbon–oxygen separation at crystallization yields delays larger than 2 Gyr to cool down to luminosities corresponding to the observed cut–off.
E. García-Berro, M. Hernanz
openaire   +1 more source

DETECTION OF A WHITE DWARF COMPANION TO THE WHITE DWARF SDSSJ125733.63+542850.5 [PDF]

The Astrophysical Journal, 2011
SDSSJ125733.63+542850.5 (hereafter SDSSJ1257+5428) is a compact white dwarf binary from the Sloan Digital Sky Survey that exhibits high-amplitude radial velocity variations on a period of 4.56 hours. While an initial analysis suggested the presence of a neutron star or black-hole binary companion, a follow-up study concluded that the spectrum was ...
Marsh, T. R., Gaensicke, B. T., Steeghs, D., Southworth, J., Koester, Detlev, Harris, V., Merry, L.   +6 more
openaire   +3 more sources

A planetesimal orbiting within the debris disc around a white dwarf star [PDF]

Science, 2019
A low-mass planet around a white dwarf Numerous exoplanets have been detected around Sun-like stars. These stars end their lives as white dwarfs, which should inherit any surviving planetary systems. Manser et al.
C. Manser, B. Gänsicke, S. Eggl, M. Hollands, P. Izquierdo, D. Koester, J. Landstreet, W. Lyra, T. Marsh, F. Meru, A. Mustill, P. Rodríguez-Gil, O. Toloza, D. Veras, David J. Wilson, M. Burleigh, M. Davies, J. Farihi, N. G. Gentile Fusillo, D. de Martino, S. Parsons, A. Quirrenbach, R. Raddi, S. Reffert, M. Del Santo, M. Schreiber, R. Silvotti, S. Toonen, E. Villaver, M. Wyatt, Siyi Xu, S. P. Portegies Zwart   +31 more
semanticscholar   +1 more source

The mass and radius of the M dwarf companion to GD 448 [PDF]

, 1998
We present spectroscopy and photometry of GD 448, a detached white dwarf - M dwarf binary with a period of 2.47h. We find that the NaI 8200A feature is composed of narrow emission lines due to irradiation of the M dwarf by the white dwarf within broad ...
Dhillon, V. S., Hilditch, R. W., Marsh, T. R., Maxted, P. F. L., Moran, C.   +4 more
core   +5 more sources

ON THE EVOLUTION OF MAGNETIC WHITE DWARFS [PDF]

The Astrophysical Journal, 2015
We present the first radiation magnetohydrodynamics simulations of the atmosphere of white dwarf stars. We demonstrate that convective energy transfer is seriously impeded by magnetic fields when the plasma-beta parameter, the thermal to magnetic pressure ratio, becomes smaller than unity.
P.-E. Tremblay, G. Fontaine, B. Freytag, O. Steiner, H.-G. Ludwig, M. Steffen, S. Wedemeyer, P. Brassard   +7 more
openaire   +3 more sources

A magnetic white dwarf in a detached eclipsing binary [PDF]

, 2013
SDSS J030308.35+005444.1 is a close, detached, eclipsing white dwarf plus M dwarf binary which shows a large infrared excess which has been interpreted in terms of a circumbinary dust disc.
Applegate, Araujo-Betancor, B. T. Gänsicke, Backhaus, Beuermann, Beuermann, Brinkworth, Burleigh, Campbell, Campbell, Claret, Copperwheat, Copperwheat, D'Odorico, Davis, Debes, Debes, Dhillon, Dobbie, Dobbie, Faulkner, Feiden, Ferrario, Ferrario, Ferrario, Ferrario, Friedrich, Gianninas, Greenstein, Gänsicke, Gänsicke, Kafka, Kafka, Kissler-Patig, Kraft, Külebi, Külebi, Li, Liebert, Liebert, Lubow, M. C. P. Bours, M. R. Schreiber, Marsh, Matranga, Maxted, Morales, O'Donoghue, Parsons, Parsons, Parsons, Parsons, Parsons, Potter, Pretorius, Pyrzas, Pyrzas, Rappaport, Rebassa-Mansergas, Rebassa-Mansergas, Reimers, Reimers, Ribeiro, S. G. Parsons, S. P. Littlefair, Schmidt, Schmidt, Schreiber, Schwope, Schwope, Silvestri, Silvestri, Smith, Steeghs, Stockman, T. R. Marsh, Tappert, Terrien, Tout, V. S. Dhillon, Verbunt, Vogel, Vogel, Watson, Wickramasinghe, Wickramasinghe, Zorotovic   +86 more
core   +3 more sources

Simulation of the white dwarf–white dwarf galactic background in the LISA data [PDF]

Classical and Quantum Gravity, 2005
14 pages and 6 figures. Submitted to Classical and Quantum Gravity (Proceedings of GWDAW9)
Edlund, J., Tinto, M., Krolak, A., Nelemans, G.   +3 more
openaire   +4 more sources

Barium and related stars, and their white-dwarf companions [PDF]

Astronomy & Astrophysics, 2019
Barium (Ba) dwarfs and CH subgiants are the less evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by their binary companions when the companion was on the asymptotic giant branch (AGB).
A. Escorza, D. Karinkuzhi, A. Jorissen, L. Siess, H. V. Winckel, D. Pourbaix, C. Johnston, B. Miszalski, Glenn-Michael Oomen, M. Abdul-Masih, H. Boffin, P. North, R. Manick, S. Shetye, J. Mikołajewska   +14 more
semanticscholar   +1 more source

White Dwarf.Org - Establishing a Permanent Endowment for the Whole Earth Telescope

Open Astronomy, 2003
White Dwarf Research Corporation is a non-profit organization dedicated to scientific research and public education on topics relevant to white dwarf stars.
Metcalfe Travis S.
doaj   +1 more source