Results 101 to 110 of about 141,416 (254)
Phylogenetic systematics of Juncaceae
American Journal of Botany, Volume 113, Issue 3, March 2026.Abstract Premise Juncaceae has needed taxonomic revision for some time. Specifically, the genus Juncus s.l. is known to be paraphyletic because five small southern‐hemisphere genera have been shown repeatedly to be nested within it. In 2022, a new classification was proposed, based on phylogenies built from one nuclear and three plastid regions ...
Reed J. Kenny +2 more
wiley +1 more source
Orbital variations and outbursts of the unusual variable star V1129 Centauri
, 2017 The variable star V1129 Cen is classified in the GCVS as being of $\beta$ Lyr type. Unusual for such stars, it exhibits outbursts roughly once a year, lasting for $\sim$40 days. For this reason, a relationship to the dwarf novae has been suspected. Here,
Bruch, Albert
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Astronomische Nachrichten, Volume 347, Issue 3, March 2026.ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik +12 more
wiley +1 more source
POSITIVE AND NEGATIVE SUPERHUMPS OF THE DWARF NOVA MN DRA
Odessa Astronomical Publications, 2010 We present the result of O–C analysis of the dwarf nova MN Dra. It is based on the multi-site photometric observations that were made over 77 nights in August – November, 2009. The total exposure was 433 hours.
D. A. Samsonov +9 more
doaj +1 more source
Binary orbits as the driver of γ-ray emission and mass ejection in classical novae [PDF]
, 2014 Classical novae are the most common astrophysical thermonuclear explosions, occurring on the surfaces of white dwarf stars accreting gas from companions in binary star systems.
A Shankar +49 more
core +2 more sources
On the Origin of Episodic Accretion in Dwarf Novae
The Astrophysical Journal, 1998 We show that dwarf nova disks in quiescence have rather low magnetic Reynolds number, of order 10^3. Numerical simulations of magnetized accretion disks suggest that under these conditions magnetohydrodynamic turbulence and the associated angular momentum transport is sharply reduced.
Gammie, Charles F., Menou, Kristen
openaire +2 more sources
Hot white dwarfs and the UV delay in dwarf novae [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 We calculate the effect of illumination of dwarf nova accretion discs by radiation from a hot, central, white dwarf. We show that only for very hot white dwarfs (Teff ~ 40 000$ K) the inner region of quiescent dwarf nova discs are partially depleted so that the delay between the rise to outburst of the optical and UV fluxes would be increased as ...
Hameury, J. -M. +2 more
openaire +2 more sources
NON-THERMAL EMISSION FROM CATACLYSMIC VARIABLES: IMPLICATIONS ON ASTROPARTICLE PHYSICS
Acta Polytechnica, 2013 We review the lines of evidence that some cataclysmic variables (CVs) are the sources of non-thermal radiation. It was really observed in some dwarf novae in outburst, a novalike CV in the high state, an intermediate polar, polars, and classical novae ...
Vojtech Šimon
doaj +1 more source
The Accreting White Dwarfs in Cataclysmic Variables
Galaxies, 2022 Accreting white dwarfs (WDs) in cataclysmic variables (CVs) provide crucial insights about the accretion of mass and angular momentum in all types of binaries, including accreting NSs and BHs.
Edward M. Sion, Patrick Godon
doaj +1 more source
Unexpected Superoutburst and Rebrightening of AL Comae Berenices in 2015
, 2015 In 2015 March, the notable WZ Sge-type dwarf nova AL Com exhibited an unusual outburst with a recurrence time of ${\sim}$1.5 yr, which is the shortest interval of superoutbursts among WZ Sge-type dwarf novae.
Dubovsky, Pavol A. +12 more
core +1 more source