Results 161 to 170 of about 1,914,179 (372)
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 +3 more
core +1 more source
, 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. The simplicity of these objects, the fact that the physical inputs necessary to understand them are well identified, although not always well understood, and the impressive ...
Isern, J. +4 more
openaire +3 more sources
White dwarf dynamical interactions
, 2023 Merging white dwarfs is a promising channel to trigger Type Ia supernovae, known as the double degenerate scenario. Supernovae are stellar explosions that radiate as much energy as any ordinary star is expected to emit over its entire life span, outshining briefly the whole hosting galaxy.
openaire +4 more sources
Corporate Social Responsibility and Environmental Management, EarlyView.ABSTRACT This study explores how environmental, social, and governance (ESG) performance‐based peer pressure influences corporate resilience, with a focus on the moderating effects of firm‐perceived economic policy uncertainty (FEPU) and governance efficiency (GE).
Han Lu +2 more
wiley +1 more source
Uncovering ESG Ratings: The (Im)Balance of Aspirational and Performance Features
Corporate Social Responsibility and Environmental Management, EarlyView.ABSTRACT Environmental, Social, and Governance (ESG) scores are crucial for evaluating corporate sustainability. However, the undisclosed and complex methodologies used by rating agencies have raised concerns about their reliability and consistency. This study replicates LSEG's ESG scoring methodology using machine learning to shed light on the key ...
Andrea Ferro +2 more
wiley +1 more source
Searching for strange quark matter objects among white dwarfs
Physics Letters B, 2022 The ground state of matter may be strange quark matter (SQM), not hadronic matter. A whole sequence of SQM objects, ranging from strange quark stars and strange quark dwarfs to strange quark planets, can stably exist according to this SQM hypothesis.
Abdusattar Kurban +3 more
doaj
On the incidence of weak magnetic fields in DA white dwarfs
, 2012 Context: About 10% of white dwarfs have magnetic fields with strength in the range between about 10^5 and 3x10^8 G. It is not known whether the remaining white dwarfs are not magnetic, or if they have a magnetic field too weak to be detected with the ...
Aurière +38 more
core +1 more source
The age of white dwarf companions
Journal of Physics: Conference Series, 2009 4 pages, 2 figures, Proceedings to 16th European WD Workshop Meeting ...
S. Weston, Ralf Napiwotzki
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ChemSusChem, EarlyView.The present review explores the recent advancements of NiCo2S4/graphene nanocomposite as a promising active material for supercapacitors. Machine learning models are demonstrated to analyze the specific capacitance variation with respect to different synthesis parameters, morphology, energy density, and power density.
Heena S. Mulla +6 more
wiley +1 more source
Might Carbon-Atmosphere White Dwarfs Harbour a New Type of Pulsating Star?
, 2008 In the light of the recent and unexpected discovery of a brand new type of white dwarfs, those with carbon-dominated atmospheres, we examine the asteroseismological potential of such stars. The motivation behind this is based on the observation that past
Beauchamp +11 more
core +1 more source