Results 71 to 80 of about 73,128 (295)

White dwarf cooling sequences and cosmochronology

EPJ Web of Conferences, 2013
The evolution of white dwarfs is a simple gravothermal process. This means that their luminosity function, i.e. the number of white dwarfs per unit bolometric magnitude and unit volume as a function of bolometric magnitude, is a monotonically increasing ...
García-Berro E., Artigas A., Isern J.
doaj   +1 more source

Description of the skull, braincase, and dentition of Moschognathus whaitsi (Dinocephalia, Tapinocephalia), and its palaeobiological and behavioral implications

The Anatomical Record, EarlyView.
Abstract A subadult Moschognathus whaitsi from the Eastern Cape Province, South Africa, was scanned using synchrotron radiation X‐ray computed tomography (SRXCT). Its subadult state allowed the cranial bones and teeth to be identified and individually reconstructed in 3D.
Tristen Lafferty, Luke A. Norton, Aliénor Duhamel, Julien Benoit   +3 more
wiley   +1 more source

Predicted incidence of Jupiter-like planets around white dwarfs

Astronomy & Astrophysics
Context. Gas-giant planets and brown dwarfs have been discovered in large numbers around main-sequence stars and even evolved stars. In contrast, and despite ongoing imaging surveys using state-of-the-art facilities, only a handful of substellar ...
Mauch-Soriano Alex, Schreiber Matthias R., Correa Diego, Pinilla Julio, Riveros-Jara Catalina, Vivanco Javiera, Ronco Maria Paula, Belloni Diogo, Lagos-Vilches Felipe, Brandner Wolfgang   +9 more
doaj   +1 more source

A study of high proper-motion white dwarfs I. Spectropolarimetry of a cool hydrogen-rich sample

, 2012
We conducted a spectropolarimetic survey of 58 high proper-motion white dwarfs which achieved uncertainties of >2 kG in the Halpha line and >5 kG in the upper Balmer line series.
Adéla Kawka, Aurière, Aznar Cuadrado, Bagnulo, Barstow, Benvenuto, Bergeron, Bergeron, Brinkworth, Burleigh, Carollo, Carrier, Chiba, Costa, Dobbie, Dufour, Eggen, Eggen, Eggen, Fabrika, Farihi, Ferrario, Garcés, García-Berro, Garstang, Giammichele, Gianninas, Girardi, Girven, Gould, Greenstein, Hintzen, Johnson, Jordan, Jordan, Kalirai, Kawka, Kawka, Kawka, Kawka, Kawka, Kawka, Kawka, Kawka, Kawka, Kemic, Kepler, Kilic, Kilic, Kilkenny, Kleinman, Koester, Koester, Kowalski, Lamontagne, Limoges, Luyten, Luyten, Lépine, Lépine, Martin, Maxted, Maxted, McCook, Muslimov, Nordhaus, Oppenheimer, Patat, Pauli, Pokorny, Potter, Putney, Reid, Salim, Salim, Schaller, Schilbach, Schmidt, Schmidt, Schmidt, Serenelli, Silvestri, Skrutskie, Smith, Stéphane Vennes, Subasavage, Subasavage, Tout, Tremblay, Valyavin, van Leeuwen, Vennes, Vennes, Vennes, Vergely, Welsh, Wesemael, Wickramasinghe, Zuckerman, Zuckerman   +99 more
core   +1 more source

Rethinking brachycephaly: Anatomical implications and health considerations in lagomorphs

The Anatomical Record, EarlyView.
Abstract Brachycephaly in domestic rabbits is increasingly perceived by welfare organizations as associated with significant health complications, particularly oral pathologies. Despite this perception, comparative anatomical research into rabbit brachycephaly is limited compared to that of dogs and cats, compelling an in‐depth examination of its ...
Helaina Cressy, Alice Nishigaki, Matthew C. Gage, Renato L. Previdelli   +3 more
wiley   +1 more source

Novel Atmospheric Dynamics Shape the Inner Edge of the Habitable Zone around White Dwarfs

The Astrophysical Journal
White dwarfs offer a unique opportunity to search nearby stellar systems for signs of life, but the habitable zone around these stars is still poorly understood.
Ruizhi Zhan, Daniel D. B. Koll, Feng Ding   +2 more
doaj   +1 more source

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

Dynamical instability of white dwarfs and breaking of spherical symmetry under the presence of extreme magnetic fields

, 2014
Massive, highly magnetized white dwarfs with fields up to $10^9$ G have been observed and theoretically used for the description of a variety of astrophysical phenomena.
Coelho, J. G., Cáceres, D. L., Malheiro, M., Marinho, R. M., Negreiros, R., Rueda, J. A., Ruffini, R.   +6 more
core   +1 more source

Graman Revisited Once Again: A Reanalysis of the Late Holocene Legacy Faunal Assemblage From GB4 Rockshelter, New South Wales

Archaeology in Oceania, EarlyView.
ABSTRACT The archaeological site Graman B4 provided one of the first records of substantial dietary change in ancient Australian Aboriginal society. Initial examination of the faunal remains from this site suggested that Late Holocene hunters reduced their focus on high‐ranked kangaroos to increasingly rely on arboreal possums; and that these ...
Loukas George Koungoulos, Jane Balme, Sue O'Connor   +2 more
wiley   +1 more source

Detection of the Temperature Dependence of the White Dwarf Mass–Radius Relation with Gravitational Redshifts

The Astrophysical Journal
Models predict that the well-studied mass–radius relation of white dwarf stars depends on the temperature of the star, with hotter white dwarfs having larger masses at a given radius than cooler stars.
Nicole R. Crumpler, Vedant Chandra, Nadia L. Zakamska, Gautham Adamane Pallathadka, Stefan Arseneau, Nicola Gentile Fusillo, J. J. Hermes, Carles Badenes, Priyanka Chakraborty, Boris T. Gänsicke, Stephen P. Schmidt   +10 more
doaj   +1 more source