Results 101 to 110 of about 84,708 (345)

Essential work, invisible workers: The role of digital curation in COVID‐19 Open Science

Journal of the Association for Information Science and Technology, Volume 76, Issue 4, Page 703-717, April 2025.
Abstract In this paper, we examine the role digital curation practices and practitioners played in facilitating open science (OS) initiatives amid the COVID‐19 pandemic. In Summer 2023, we conducted a content analysis of available information regarding 50 OS initiatives that emerged—or substantially shifted their focus—between 2020 and 2022 to address ...
Irene V. Pasquetto, Amina A. Abdu, Natascha Chtena   +2 more
wiley   +1 more source

White Dwarfs

Le Journal de Physique Colloques, 1980
The thermal properties and neutrino emissivity of matter in the dense, degenerate cores of white dwarfs, together with efficient heat transport through the high-density envelopes of these stars, affect the theoretical white dwarf luminosity function.
openaire   +2 more sources

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

Axions and White Dwarfs

, 2010
White dwarfs are almost completely degenerate objects that cannot obtain energy from the thermonuclear sources and their evolution is just a gravothermal process of cooling.
Catalan, S., Garcia-Berro, E., Isern, J., Salaris, M., Torres, S.   +4 more
core   +1 more source

Radial Velocity Monitoring and Analysis of Gaia Astrometry of Selected Intermediate Mass Stars to Constrain Their Multiplicity Status

Astronomische Nachrichten, EarlyView.
ABSTRACT We present new radial velocity measurements of 13 selected intermediate mass stars (2–6 M⊙). The measurements were performed between 29 April and 6 September 2024 at the University Observatory Jena using the échelle spectrograph FLECHAS. The radial velocity of eight stars was found to be constant during our spectroscopic monitoring, namely: 17
J. Bätz, M. Mugrauer, K.‐U. Michel, J. Reichert, A. Tschirschky, L. Pietsch, F. Edelmann, R. Neuhäuser   +7 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

Non-LTE spectral analyses of the lately discovered DB-gap white dwarfs from the SDSS

, 2009
For a long time, no hydrogen-deficient white dwarfs have been known that have effective temperature between 30 kK and < 45 kK, i.e. exceeding those of DB white dwarfs and having lower ones than DO white dwarfs.
Dreizler S, Eisenstein D J Liebert J Koester D, S D Hügelmeyer, S Dreizler   +3 more
core   +1 more source

The donor star radial velocity curve in the cataclysmic variable GY Cnc confirms white dwarf eclipse modelling mass [PDF]

, 2023
S. P. Littlefair, P. Rodríguez-Gil, T. R. Marsh, S. G. Parsons, V. S. Dhillon   +4 more
openalex   +1 more source

PERICLES: A Set of Empirical Rotational Isochrones Modeled on Cool Dwarfs in Open Clusters and Wide Binaries

Astronomische Nachrichten, EarlyView.
ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley   +1 more source

I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility [PDF]

, 2021
Joseph A. Guidry, Zachary P Vanderbosch, J. J. Hermes, Brad N. Barlow, Isaac D. Lopez, Thomas M. Boudreaux, Kyle A. Corcoran, Keaton J. Bell, M.H. Montgomery, Tyler M. Heintz, Barbara G. Castanheira, Joshua S. Reding, Bart H. Dunlap, D.E. Winget, Karen I. Winget, J. W. Kuehne   +15 more
openalex   +1 more source