Results 111 to 120 of about 83,891 (346)

The Decline and Fall of ROME. V. A Preliminary Search for Star-disrupted Planet Interactions and Coronal Activity at 5 GHz among White Dwarfs within 25 pc

The Astrophysical Journal
The recent discovery of planetesimals orbiting white dwarfs has renewed interest in the final chapters of the evolution of planetary systems. Although observational and theoretical studies have examined the dynamical evolution of these systems, studies ...
Matthew Route
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

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, EarlyView.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Structural Implications of the Chameleon Mechanism on White Dwarfs

Universe
We study the behaviour of the chameleon mechanism around white dwarfs and its impact on their structure. Using a shooting method of our own design, we solve the corresponding scalar–tensor equilibrium equations for a Chandrasekhar equation of state ...
Joan Bachs-Esteban, Ilídio Lopes, Javier Rubio   +2 more
doaj   +1 more source

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

White-dwarf asteroseismology: An update [PDF]

Proceedings of the International Astronomical Union, 2019
AbstractThe vast majority of stars that populate the Universe will end their evolution as white-dwarf stars. Applications of white dwarfs include cosmochronology, evolution of planetary systems, and also as laboratories to study non-standard physics and crystallization. In addition to the knowledge of their surface properties from spectroscopy combined
openaire   +4 more sources

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, EarlyView.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Branes constrictions with White Dwarfs [PDF]

The European Physical Journal C, 2015
7 pages, 3 figures.
openaire   +3 more sources

Indonesian inquiry: A narrative of biocultural teaching on Sulawesi Utara

British Educational Research Journal, EarlyView.
Abstract Using phenomenology, narrative inquiry and autoethnographic approaches, this study analyses a program of faculty development conducted alongside the delivery of an international field school. Through this study, we explore the value and benefits of inter‐cultural field programming and how these might serve to complement or to redress ...
David Zandvliet, Wiske Rotinsulu
wiley   +1 more source

Astrophysics of white dwarf binaries [PDF]

AIP Conference Proceedings, 2006
White dwarf binaries are the most common compact binaries in the Universe and are especially important for low-frequency gravitational wave detectors such as LISA. There are a number of open questions about binary evolution and the Galactic population of white dwarf binaries that can be solved using gravitational wave data and at the same time, our ...
openaire   +5 more sources