Results 91 to 100 of about 116,162 (381)

Evidence from K2 for rapid rotation in the descendant of an intermediate-mass star [PDF]

, 2017
Using patterns in the oscillation frequencies of a white dwarf observed by K2, we have measured the fastest rotation rate, 1.13(02) hr, of any isolated pulsating white dwarf known to date.
Bell, Keaton J., Clemens, J. C., Dennihy, E., Dunlap, B. H., Gaensicke, B. T., Hermes, J. J., Kawaler, Steven D., Kepler, S. O., Montgomery, M. H., Redfield, S., Romero, A. D., Tremblay, P. -E.   +11 more
core   +3 more sources

Disk or Companion: Characterizing Excess Infrared Flux in Seven White Dwarf Systems with Near-infrared Spectroscopy

The Astronomical Journal, 2023
Excess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations with Keck/MOSFIRE, Gemini/GNIRS, and Gemini/Flamingos-2 of seven white dwarfs ...
Dylan Owens, Siyi Xu, Elena Manjavacas, S. K. Leggett, S. L. Casewell, Erik Dennihy, Patrick Dufour, Beth L. Klein, Sherry Yeh, B. Zuckerman   +9 more
doaj   +1 more source

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, Stéphane Charpinet, Pierre Brassard   +2 more
doaj   +1 more source

Pulsations in white dwarf stars [PDF]

Proceedings of the International Astronomical Union, 2013
AbstractWe first present a brief description of the six distinct families of pulsating white dwarfs that are now known. These are all opacity-driven pulsators showing low- to mid-order, low-degree gravity modes. We then discuss some recent highlights that have come up in the field of white dwarf asteroseismology.
Fontaine, Gilles, Bergeron, Pierre, Brassard, Pierre, Charpinet, Stéphane, Dufour, Patrick, Giammichele, Noemi, Randall, Suzanna K., Van Grootel, Valérie   +7 more
openaire   +2 more sources

Genome‐Wide Association Analyses Reveal the Genetic Basis of EMS Mutagenesis Efficiency in Rice

Advanced Science, EarlyView.
Based on large‐scale screening of 420 rice accessions, GWAS identified the Rc locus as a key regulator of EMS mutagenesis efficiency. Functional Rc alleles enhance both seed survival and genome‐wide mutation frequency by boosting antioxidant enzyme activities (CAT, SOD, POD) and reducing oxidative damage.
Peizhou Xu, Qinglu Zhang, Le Xue, Zhen Zhang, Nanhui Luo, Zhaoyang Cheng, Duo Xia, Shuqin Zheng, Xianjun Wu, Hao Zhou   +9 more
wiley   +1 more source

Limits on the Halo White Dwarf Component of Baryonic Dark Matter from the {\em Hubble Deep Field} [PDF]

, 1996
The MACHO collaboration lensing event statistics suggest that a significant fraction of the dark galactic halo can be comprised of baryonic matter in the form of white dwarf stars with masses between 0.1 and 1.0 \Msun . Such a halo white dwarf population,
Bennett D., Mestel L., Steven D. Kawaler, Williams R.   +3 more
core   +3 more sources

Comparative Insights and Overlooked Factors of Interphase Chemistry in Alkali Metal‐Ion Batteries

Advanced Energy Materials, EarlyView.
This review presents a comparative analysis of Li‐, Na‐, and K‐ion batteries, focusing on the critical role of electrode–electrolyte interphases. It especially highlights overlooked aspects such as SEI/CEI misconceptions, binder effects, and self‐discharge relevance, emphasizing the limitations of current understanding and offering strategies for ...
Changhee Lee, Zachary T. Gossage, Shinichi Kumakura, Shinichi Komaba   +3 more
wiley   +1 more source

The seismic properties of low-mass He-core white dwarf stars [PDF]

, 2012
Context. In recent years, many low-mass (0.45 M ) white dwarf stars expected to harbor He cores have been detected in the field of the Milky Way and in several galactic globular and open clusters.
A. C'orsico, A. Romero, L. Althaus, J. Hermes   +3 more
semanticscholar   +1 more source

The Insistence of Blackness and the Persistence of Antiblackness in Ireland

Australian Journal of Social Issues, EarlyView.
ABSTRACT This paper positions Ireland as a critical site for examining the insistence of blackness and an antiblackness created and sustained through Irish ethnonationalist imaginaries and exclusionary processes. Drawing on connected sociologies and Irish Black Studies, this enquiry argues that antiblackness in Ireland operates as a generational force,
Philomena Mullen
wiley   +1 more source

The Chromospheric Activity and Ages of M Dwarf Stars in Wide Binary Systems [PDF]

, 2005
We investigate the relationship between age and chromospheric activity for 139 M dwarf stars in wide binary systems with white dwarf companions. The age of each system is determined from the cooling age of its white dwarf component. The current limit for
Abt H. A., Boss A. P., Byrne P. B., Byrne P. B., Delfosse X., Giclas H. L., Nicole M. Silvestri, Pettersen B. R., Pringle J. E., Reid I. N., Suzanne L. Hawley, Terry D. Oswalt, Weidemann V.   +12 more
core   +4 more sources