Results 81 to 90 of about 1,989,293 (378)

Relativistic deflection of background starlight measures the mass of a nearby white dwarf star [PDF]

Science, 2017
General relativity weighs a white dwarf Light from a background star is deflected by the gravitational field of the Sun. This effect was used in 1919 to provide some of the first evidence for general relativity. Sahu et al. applied the concept to another
K. Sahu, Jay Anderson, S. Casertano, H. Bond, P. Bergeron, E. Nelan, L. Pueyo, T. Brown, A. Bellini, Z. Levay, J. Sokol, M. Dominik, A. Calamida, N. Kains, M. Livio   +14 more
semanticscholar   +1 more source

A consistency test of white dwarf and main sequence ages: NGC 6791

EPJ Web of Conferences, 2013
NGC 6791 is an open cluster that it is so close to us that can be imaged down to very faint luminosities. The main sequence turn-off age (∼8 Gyr) and the age derived from the cut-off of the white dwarf luminosity function (∼6 Gyr) were found to be ...
Córsico A.H., Isern J., Salaris M., García-Berro E., Torres S., Althaus L.G.   +5 more
doaj   +1 more source

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

Features of the mass transfer in magnetic cataclysmic variables with fast-rotating white dwarfs

EPJ Web of Conferences, 2014
The flow structure in magnetic cataclysmic variables was investigated taking into account the effects of strong magnetic field and fast rotation of the white dwarf. We modeled the AE Aqr system as a unique object that has the rotation period of the white
Isakova Polina, Zhilkin Andrey, Bisikalo Dmitry   +2 more
doaj   +1 more source

Spun-Up Rotation-Powered Magnetized White Dwarfs in Close Binaries as Possible Gamma-ray Sources: Signatures of Pulsed Modulation from AE Aquarii and AR Scorpii in Fermi-LAT Data

Galaxies, 2023
In this paper, the possibility of periodic pulsar-like gamma-ray emission from the white dwarfs in AE Aquarii and AR Scorpii is investigated. We show that the white dwarf magnetospheres in AE Aquarii and AR Scorpii can possibly induce potentials to ...
Pieter J. Meintjes, Spencer T. Madzime, Quinton Kaplan, Hendrik J. van Heerden   +3 more
doaj   +1 more source

Anomalous cooling of the massive white dwarf in U Geminorum following a narrow dwarf nova outburst [PDF]

, 1997
We obtained Hubble GHRS medium resolution (G160M grating) phase-resolved spectroscopic observations of the prototype dwarf nova U Geminorum during dwarf nova quiescence, 13 days and 61 days following the end of a narrow outburst.
Boris Gansicke, Edward M. Sion, F. H. Cheng, Friend M. T., Gansicke B. T., Janet Mattei, Min Huang, Paula Szkody, Warren Sparks   +8 more
core   +2 more sources

Current challenges in the physics of white dwarf stars [PDF]

Physics reports, 2022
D. Saumon, S. Blouin, P. Tremblay
semanticscholar   +1 more source

White Dwarfs and Dark Matter [PDF]

Science, 2001
Accepted for publication as a Technical Comment in Science, in response to Oppenheimer et al. (2001, Science, 292, 698)
Gibson, B. K., Flynn, Chris
openaire   +5 more sources

Co‐overexpression of the caloric restriction‐induced mitochondrial factors PGC‐1α and MIPEP upregulates Phospho1 expression in adipocytes

FEBS Open Bio, EarlyView.
Caloric restriction that extends lifespan induces the expression of PGC‐1α and MIPEP in white adipose tissue. In this study, co‐overexpression of Pgc‐1α and Mipep upregulated the gene expression of PHOSPHO1. These findings provide new insights into mitochondria‐related mechanisms underlying the effects of caloric restriction in adipocytes.
Mamiko Ishimatsu, Kanari Taki, Asuka Hayami, Komachi Kato, Yuka Nozaki, Yuhei Mizunoe, Takumi Narita, Ryoichi Mori, Yoshikazu Higami, Masaki Kobayashi   +9 more
wiley   +1 more source

Spectroscopic confirmation of a white dwarf companion to the B star 16 Dra [PDF]

, 2000
Using an Extreme Ultraviolet Explorer (EUVE) spectrum, we confirm the identification of a white dwarf companion to the B9.5V star 16 Dra (HD150100), and constrain its surface temperature to lie between 29,000K and 35,000K.
Barstow, Martin, Burleigh, Matt
core   +1 more source