Results 1 to 10 of about 715,251 (227)
New Chondritic Bodies Identified in Eight Oxygen-bearing White Dwarfs
The Astrophysical Journal, 2023 We present observations and analyses of eight white dwarf stars (WDs) that have accreted rocky material from their surrounding planetary systems. The spectra of these helium-atmosphere WDs contain detectable optical lines of all four major rock-forming ...
Alexandra E. Doyle +10 more
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The Astrophysical Journal, 2023 In the framework of our extensive modeling study of the spectral evolution of white dwarfs, we present here a new set of detailed calculations of the transport of residual hydrogen in helium-rich white dwarfs. First, we investigate the so-called float-up
A. Bédard, P. Bergeron, P. Brassard
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Seismic Cartography of White-Dwarf Interiors From the Toulouse-Montréal Optimal-Design Approach
Frontiers in Astronomy and Space Sciences, 2022 Probing internal properties of white-dwarf stars has been amongst the earliest objectives of asteroseismology, following the first discovery in the late 1960s of non-radial pulsations in these evolved compact stars.
Noemi Giammichele +2 more
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A White Dwarf Search Model Based on a Deep Transfer-learning Method
The Astrophysical Journal Supplement Series, 2023 White dwarfs represent the ultimate stage of evolution for over 97% of stars and play a crucial role in studies of the Milky Way’s structure and evolution.
Lei Tan +5 more
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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.
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Results on (UN)Published Wet Runs on Pulsating DB White Dwarfs
Open Astronomy, 2003 I have collected all the WET archival data on the pulsating DB white dwarf stars (DBVs) and re-reduced them. In addition, the WET has recently observed three DBVs.
Handler G.
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Detection Method for Space Dim and Weak Group Targets in Dense Star Fields [PDF]
Jisuanji gongchengThe high similarity between spatial targets and background features in dense star fields can easily lead to numerous false alarms during detection. In addition, space targets often exhibit weak and dim features under long-distance detection conditions ...
LI Yiran, NIE Hongbin, YANG Ziqian, BIAN Chunjiang
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Stark Broadening and White Dwarfs
Open Astronomy, 2011 White dwarf and pre-white dwarfs are the best types of stars for the application of Stark broadening research results in astrophysics, since in the atmospheres of these stars physical conditions are very favorable for this line broadening mechanism - in ...
Dimitrijević Milan S. +3 more
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A survey of pulsating DA and DB white dwarfs Observations with the Whole Earth Telescope
EPJ Web of Conferences, 2017 White dwarfs represent the end point of stellar evolution for the majority of stars. As such, they are excellent astrophysical laboratories. They are structurally simple, with electron degenerate cores surrounded by thin surface layers of helium and/or ...
Provencal J. L. +2 more
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Odessa Astronomical Publications, 2007 It has been shown quite recently (Morales-Rueda et al., 2003) that dB stars, extreme horisontal branch (EHB) objects in high probability all belong to binary systems.
V. -V. Pustynski, I. Pustylnik
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