Results 111 to 120 of about 34,923 (243)

Water Parameters and Hydrodynamics in Rivers and Caves Hosting Astyanax mexicanus Populations Reveal Macro‐, Meso‐ and Microhabitat Characteristics

open access: yesEcology and Evolution, Volume 16, Issue 1, January 2026.
From 2009 to 2025, we have recorded the physicochemical parameters of the water and the hydrological regimes at localities hosting Astyanax mexicanus cavefish and surface fish populations in Mexico. Sampling 13 caves and 30 surface stations revealed strong signatures of the two macrohabitats, but also significant differences in specific water ...
Laurent Legendre   +5 more
wiley   +1 more source

V751 Cyg and V Sge as transient supersoft X-ray sources

open access: yes, 1999
I review the observational evidence for luminous, soft X-ray emission during optical low-states in the two cataclysmic variables V751 Cyg and V Sge, and discuss the possible link to the canonical supersoft X-ray sources.Comment: 6 pages with newarcrc.sty;
Greiner, J.
core   +2 more sources

Overwinter gains in body fat challenge assumptions about winter nutrition in northern ungulates

open access: yesEcosphere, Volume 16, Issue 12, December 2025.
Abstract Animals in northern environments contend with seasonally variable resources and have evolved life histories to cope with the flush of nutrients in summer and scarcity in winter. Ungulates cope with seasonal variation in resources by accreting fat stores when resources are plentiful during the growing season and then mobilizing these stores to ...
Kristin Denryter, John A. Crouse
wiley   +1 more source

Optical Spectroscopy of the Most Compact Accreting Binary Harboring a Magnetic White Dwarf and a Hydrogen-rich Donor

open access: yesThe Astrophysical Journal Letters
Accreting white dwarfs (WDs) in close binary systems, commonly known as cataclysmic variables (CVs), with orbital periods below the canonical period minimum (≈80 minutes) are rare.
Ilkham Galiullin   +6 more
doaj   +1 more source

Present‐Day Thermal State and Surface Heat Flux of the Moon

open access: yesJournal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract The concentration of volcanic material and Heat‐Producing Elements (HPE) on the lunar nearside surface suggests an asymmetry of interior properties and thermal history between the two hemispheres. However, the distribution of HPE beneath the surface and the processes that led to their potential enrichment on the nearside remain poorly ...
Sabatino Santangelo   +4 more
wiley   +1 more source

A New Window for Studying Intermediate Polars and Tilted Accretion Disk Precession

open access: yesThe Astrophysical Journal
TV Col is a long-period eclipsing intermediate polar (IP) prototype star for the negative superhump (NSH) system. We investigate the eclipse minima, eclipse depth, and NSH amplitude based on TESS photometry.
Qi-Bin Sun   +7 more
doaj   +1 more source

Idling Magnetic White Dwarf in the Synchronizing Polar BY Cam. The Noah-2 Project

open access: yes, 2008
Results of a multi-color study of the variability of the magnetic cataclysmic variable BY Cam are presented. The observations were obtained at the Korean 1.8m and Ukrainian 2.6m, 1.2m and 38-cm telescopes in 2003-2005, 56 observational runs cover 189 ...
A. Bianchini   +49 more
core   +1 more source

Not Just Half a Doctor: Promoting Humanism During Stressful Times

open access: yes
Annals of the Child Neurology Society, Volume 4, Issue 1, Page 6-11, March 2026.
Nigel S. Bamford   +7 more
wiley   +1 more source

Searching for Accreting Compact Binary Systems from Spectroscopy and Photometry: Application to LAMOST Spectra

open access: yesThe Astrophysical Journal
Compact objects undergoing mass transfer exhibit significant (and double-peaked) H _α emission lines. Recently, new methods have been developed to identify black hole X-ray binaries and calculate their systematic parameters using H _α line parameters ...
Xinlin Zhao, Song Wang, Jifeng Liu
doaj   +1 more source

X-ray Sources and their Optical Counterparts in the Globular Cluster M4

open access: yes, 2004
We report on the Chandra X-ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC 6121). We detect 12 X-ray sources inside the core and 19 more within the cluster half-mass radius. The limiting luminosity of this observation
Anderson, S.F.   +12 more
core   +2 more sources

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