Results 111 to 120 of about 9,193 (307)

Rotation velocities of white dwarfs [PDF]

, 2005
The sharp Hα NLTE line cores of hydrogen-rich (DA) white dwarfs allow their projected rotational velocities to be determined. High resolution optical spectra of 22 stars obtained with the Keck I telescope are matched by synthetic spectra computed from a
S. Dreizler, Karl, C. A., R. Napiwotzki, I. N. Reid, Heber, Ulrich, U. Heber, Napiwotzki, R., C. A. Karl, Koester, D., Dreizler, Stefan, D. Koester, Reid, I. Neill   +11 more
core   +1 more source

Environmental and local habitat variables as predictors of trophic interactions in subtidal rocky reefs along the SE Pacific coast

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, Alistair G. B. Poore, Oscar Pino, Nicolás Riquelme, Wolfgang B. Stotz, Fadia Tala, Martin Thiel   +6 more
wiley   +1 more source

Dilution of accreted planetary matter in hot DA white dwarfs according to their mass

Astronomy & Astrophysics
Context. A large proportion of observed white dwarfs show evidence of debris disks, remnants of the former planetary systems, and/or signatures of heavy elements in their atmospheres, induced by the accretion of planetary matter onto their surfaces.
Deal M., Vauclair S., Charpinet S., Vauclair G.   +3 more
doaj   +1 more source

MAGNETISM OF WHITE DWARFS (intermediate results of a survey for kilogauss magnetic fields in white dwarfs)

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, S. Bagnulo, S. Fabrika, A. Reisenegger, G. A. Wade, Inwoo Han, D. Monin   +6 more
doaj   +1 more source

Astrophysics with white dwarfs [PDF]

, 2004
White dwarfs are the end products of the entire stellar evolutionary process in all intermediate and low mass stars. Over 99% of all stars in our Galaxy will eventually end their lives as white dwarfs.
Kalirai, Jasonjot Singh
core  

GRMHD formulation of highly super-Chandrasekhar magnetized white dwarfs: stable configurations of non-spherical white dwarfs [PDF]

, 2015
The topic of magnetized super-Chandrasekhar white dwarfs is in the limelight, particularly in the last few years, since our proposal of their existence. By full-scale general relativistic magnetohydrodynamic (GRMHD) numerical analysis, we confirm in this
Mukhopadhyay, Banibrata, Das, Upasana
core   +1 more source

Topography constrains the climatic response of treeline migration in Taiwan's subalpine forests

Ecography, EarlyView.
Treelines are moving upslope, but the rates and drivers differ among different regions, globally. Many studies have examined the relationship between treeline movement and climate change, particularly rising temperature, while the role of topographical factors has received much less attention, despite the longstanding recognition of its importance.
Kuan‐Yu Chen, Jonathan Peereman, J. Aaron Hogan, Teng‐Chiu Lin   +3 more
wiley   +1 more source

Double white dwarfs and LISA [PDF]

, 2011
Close pairs of white dwarfs are potential progenitors of type Ia supernovae and they are common, with the order of 100-300 million in the Galaxy. As such they will be significant, probably dominant, sources of the gravitational waves detectable by LISA ...
Marsh, T R, T R Marsh, Marsh, T. R.
core   +1 more source

Cross‐Entropy of Power Spectral Density Function: A Modal Identification Framework

Earthquake Engineering &Structural Dynamics, EarlyView.
ABSTRACT The power spectral density (PSD) function of measured structural response contains a significant amount of information, including the modal parameters (natural frequencies, damping ratios). Output‐only system identification or modal identification technique can be used for extracting such modal parameters from the measured response or its ...
Su‐Hong Kim, Jae‐Seung Hwang, Dae‐Kun Kwon, Ahsan Kareem   +3 more
wiley   +1 more source

A White Dwarf Catalog from LAMOST DR11 Using Deep Learning

The Astrophysical Journal Supplement Series
White dwarfs, also referred to as degenerate dwarfs, represent the ultimate fate for the majority of stars in the Universe, unless their mass is large enough for them to evolve into black holes or neutron stars.
Shengwen Zhang, Yanxia Zhang, Chao Liu
doaj   +1 more source