Results 141 to 150 of about 112,298 (365)
White Dwarfs and Planetary Central Stars [PDF]
Symposium - International Astronomical Union, 1989 Studies of hot white dwarf samples constrain the properties and evolution of planetary nuclei and the nebulae. In particular, the white dwarf and planetary nebulae formation rates are compared. I discuss the overlap of the sequences of white dwarfs having hydrogen (DA) and helium-rich (DO) atmospheres with known central stars of high surface gravity ...
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Spitzer White Dwarf Planet Limits [PDF]
, 2006 We present preliminary limits on the presence of planets around white dwarf stars using the IRAC photometer on the Spitzer space telescope. Planets emit strongly in the mid-infrared which allows their presence to be detected as an excess at these ...
Mullally, F. +2 more
core +2 more sources
Short Wavelength Limit of the Dynamic Matsubara Local Field Correction
Contributions to Plasma Physics, EarlyView.ABSTRACT We investigate the short wavelength limit of the dynamic Matsubara local field correction G˜q,zl$$ \tilde{G}\left(\mathbf{q},{z}_l\right) $$ of the uniform electron gas based on direct ab initio path integral Monte Carlo (PIMC) results over an unprecedented range of wavenumbers, q≲20qF$$ q\lesssim 20{q}_{\mathrm{F}} $$, where qF$$ {q}_{\mathrm{
Tobias Dornheim +3 more
wiley +1 more source
The Astrophysical JournalWhite dwarfs (WDs) polluted by exoplanetary material provide the unprecedented opportunity to directly observe the interiors of exoplanets. However, spectroscopic surveys are often limited by brightness constraints, and WDs tend to be very faint, making ...
Malia L. Kao +7 more
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Low Luminosity Stars and White Dwarfs [PDF]
Highlights of Astronomy, 1974 (1) When discussing properties of stars of low luminosity we should first define what we mean by that term. My own feeling is that a bolometric luminosity of 0.001 of that of the Sun appears to be a reasonable upper limit for ‘low luminosity’. Further, it is obvious that, in order to find any numbers of them, one must go down to the very faintest ...
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Instantaneous Normal Modes of Yukawa Liquids
Contributions to Plasma Physics, EarlyView.ABSTRACT The instantaneous normal mode (INM) approach, which extends the normal mode description of collective excitations in solids to liquids, is applied to strongly coupled, three‐dimensional Yukawa liquids. Based on data from Langevin dynamics simulations, we compute the instantaneous normal modes across a wide range of coupling and screening ...
Tillman Keller, Hanno Kählert
wiley +1 more source
Measuring the Mass–Radius Relation of White Dwarfs Using Wide Binaries
The Astrophysical JournalMeasuring the mass–radius relation of individual white dwarfs is an empirically challenging task that has been performed for only a few dozen stars. We measure the white dwarf mass–radius relation using the gravitational redshifts and radii of 135 white ...
Stefan Arseneau +12 more
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On the Theory of White Dwarf Stars: II. The Accretion of Interstellar Matter by White Dwarfs [PDF]
, 1952 L. Mestel
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Ecography, EarlyView.Temperature generally drives latitudinal patterns in the strength of trophic interactions, including consumption rates. However, local community and other environmental conditions might also affect consumption, disrupting latitudinal gradients, which results in complex large‐scale patterns.
Catalina A. Musrri +6 more
wiley +1 more source
Evolution of Cataclysmic Variables with Binary-driven Mass Loss during Nova Eruptions
The Astrophysical JournalThe discrepancies between observations and theoretical predictions of cataclysmic variables (CVs) suggest that there exists unknown angular-momentum-loss mechanism(s) besides magnetic braking and gravitational radiation.
Wen-Shi Tang, Xiang-Dong Li, Zhe Cui
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