Results 41 to 50 of about 4,822,469 (343)
The DB gap and a new class of pulsating white dwarfs
EPJ Web of Conferences, 2013 The recent systematic surveys providing enormously massive datasets of white dwarfs show that there is still a deficit of a factor of 2.5 in the DA/non-DA ratio within the temperature range of 30 000 K < Teff < 45 000 K, which has been regarded as the ...
Shibahashi H.
doaj +1 more source
On mode trapping in pulsating DA white dwarf stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 5 pages, 6 figures, to be published in ...
Benvenuto, Omar Gustavo +3 more
openaire +4 more sources
Ciência e SustentabilidadeO presente artigo visa propor diretrizes para as ações institucionais, da área planejamento e administração, em prol da sustentabilidade por meio da aplicação da ferramenta Sustainability Tracking, Assessment and Rating System (STARS).
Karina Francine Marcelino +2 more
semanticscholar +1 more source
Asteroseismology of DA white dwarf stars [PDF]
Open Astronomy, 1998 Following the recent mode identification by Clemens suggesting the hydrogen layer mass of the DAV (ZZ Ceti) stars is nearly the same, I make the extreme assumption that models with a single composition profile with a hydrogen layer mass of 1.5 × 10−4M* may be able to fit the observed pulsation periods.
openaire +2 more sources
"The Visit" (2021), de Chimamanda Ngozi Adichie: feminismo literário e ficção especulativa
Ilha do Desterro, 2023 Bastante difundido nos Estados Unidos, o termo “ficção especulativa” indica uma extensa produção literária na qual conjunturas, tempos e espaços alternativos têm sido imaginados, resultando em um corpus literário rico de significados.
Cláudio R. V. Braga
doaj +1 more source
Doppler beaming factors for white dwarfs, main sequence stars, and giant stars [PDF]
Astronomy & Astrophysics, 2020 Context. Systematic theoretical calculations of Doppler beaming factors are scarce in the literature, particularly in the case of white dwarfs. Additionally, there are no specific calculations for the limb-darkening coefficients of 3D white dwarf models.
A. Claret +5 more
semanticscholar +1 more source
Spectroscopic survey of faint planetary-nebula nuclei. VI. Seventeen hydrogen-rich central stars [PDF]
Astronomy & AstrophysicsWe present an analysis of 17 H-rich central stars of planetary nebulae (PNe) observed in our spectroscopic survey of nuclei of faint Galactic PNe carried out at the 10-m Hobby-Eberly Telescope.
N. Reindl +3 more
semanticscholar +1 more source
Faint White Dwarf Flux Standards: Data and Models
The Astronomical JournalFainter standard stars are essential for the calibration of larger telescopes. This work adds to the calibration spectra (CALSPEC) database of 19 faint white dwarfs (WDs) with all-sky coverage and V magnitudes between 16.5 and 18.7.
Ralph C. Bohlin +9 more
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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
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Anisotropic compact stars in Rastall–Rainbow gravity [PDF]
Classical and quantum gravity, 2019 In this work, we investigate anisotropic effects on the equations of state (EoS) used to describe neutron and quark stars in the framework of Rastall–Rainbow gravity.
C. E. Mota +5 more
semanticscholar +1 more source