Results 121 to 130 of about 1,877,533 (362)
Odessa Astronomical Publications, 2017 We shortly present intermidiate results of a survey for weak magnetic fields among degenerate stars (white dwarfs and hot subdwarf stars). Kilogauss upper limits of longitudinal magnetic fields are presented for several brightest DA white dwarfs and new ...
G. Valyavin +6 more
doaj +1 more source
Cool DZ white dwarfs – I. Identification and spectral analysis [PDF]
, 2017 White dwarfs with metal lines in their spectra act as signposts for post-main sequence planetary systems. Searching the Sloan Digital Sky Survey (SDSS) data release 12, we have identified 231 cool ( 300 kms-1.
M. Hollands +4 more
semanticscholar +1 more source
Highlights of Astronomy, 1980 It has been known for a long time that white dwarfs are pulsationally unstable if nuclear burning takes place in their envelopes. Perturbation of energy generation rate promotes pulsational instability and this effect is frequently referred to as ε-mechanism.
openaire +2 more sources
Dark Energy From the Gravitational Wave Background With Scalar Field Dark Matter
Astronomische Nachrichten, EarlyView.ABSTRACT Recent observational results, such as those from pulsar timing arrays (PTA), suggest a low‐frequency Gravitational Wave Background (GWB) permeates our universe. This opens the possibility that gravitational waves could span a broader spectrum, potentially impacting cosmological scales.
Edwin L. Pérez‐Ochoa, Tonatiuh Matos
wiley +1 more source
The Astrophysical JournalModels 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 +10 more
doaj +1 more source
Trace hydrogen in helium atmosphere white dwarfs as a possible signature of water accretion [PDF]
, 2017 A handful of white dwarfs with helium-dominated atmospheres contain exceptionally large masses of hydrogen in their convection zones, with the metal-polluted white dwarf GD 16 being one of the earliest recognized examples.
N. G. Fusillo +11 more
semanticscholar +1 more source
The Physics of Crystallizing White Dwarfs [PDF]
The Astrophysical Journal, 1997 Accepted for publication in ApJ (16 pages, 1 figure, aasms4)
Enrique García-Berro +3 more
openaire +3 more sources
Post-common envelope binaries from SDSS-X: The origin of low-mass white dwarfs [PDF]
, 2010 We present the first white dwarf mass distributions of a large and homogeneous sample of post-common envelope binaries (PCEBs) and wide white dwarf-main sequence binaries (WDMS) directly obtained from observations. Both distributions are statistically independent, with PCEBs showing a clear concentration of systems towards the low-mass end of the ...
arxiv +1 more source
Biological Diversity, EarlyView.Abstract The production of Carica papaya L. in Kenya is seriously affected by the Moroccan watermelon mosaic virus and lack of improved varieties leading to the importation of expensive seeds for the resource‐scarce farmers. To curb these challenges, new papaya hybrid lines were recently selected and bred, but their growth traits and performance ...
Janet Chepng’etich Kosgei +4 more
wiley +1 more source
Catalog of Magnetic White Dwarfs with Hydrogen Dominated Atmospheres
The Astrophysical Journal, 2023 White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three physical parameters interact with each other and with other stellar features,
L. L. Amorim +4 more
doaj +1 more source