Results 131 to 140 of about 493,128 (267)

On the nature of dwarf novae

The Astrophysical Journal, 1983
Observational data on mass-transfer rates and radii of disks indicate that the outer parts of disks in novae and nova-like binaries are sufficiently hot for stationary accretion; those in dwarf novae are too cool to avoid an accretion instability, while these in Z Cam systems are the borderline cases.
openaire   +1 more source

Tremendous outburst amplitude dwarf novae

The Astrophysical Journal, 1995
For many years, observers have noted the existence of a number of tremendous outburst amplitude dwarf novae. We present a summary of the known observational parameters for these exceptional systems. They show outburst amplitudes of 6-10 mag, have rare outbursts (interoutburst times being months to decades), and only seem to exist in dwarf novae with ...
Steve B. Howell, Paula Szkody, John K. Cannizzo   +2 more
openaire   +1 more source

Intelligent decision‐making for parameters of slurry shield tunneling based on multi‐objective particle swarm and genetic hybrid algorithm

Computer-Aided Civil and Infrastructure Engineering, Volume 40, Issue 31, Page 6493-6512, 29 December 2025.
Abstract In slurry shield tunneling, relying solely on human experience to adjust active control parameters manually often has limitations and can lead to safety hazards. Therefore, the intelligent decision‐making for parameters of slurry shield tunneling based on machine learning algorithms is of great significance.
Dalong Jin, Yi Yang, Yue Chen, Dajun Yuan, Fulin Li   +4 more
wiley   +1 more source

Elemental and Isotopic Yields from T Coronae Borealis: Predictions and Uncertainties

The Astrophysical Journal
T Coronae Borealis (T CrB) is a symbiotic recurrent nova system expected to undergo its next outburst within the next 2 yr. Recent hydrodynamic simulations have predicted the nucleosynthetic yields for both carbon–oxygen (CO) and oxygen–neon (ONe) white ...
Emma Wallace, Christian Iliadis, Sumner Starrfield   +2 more
doaj   +1 more source

Anomalous cooling of the massive white dwarf in U Geminorum following a narrow dwarf nova outburst [PDF]

, 1997
We obtained Hubble GHRS medium resolution (G160M grating) phase-resolved spectroscopic observations of the prototype dwarf nova U Geminorum during dwarf nova quiescence, 13 days and 61 days following the end of a narrow outburst.
Boris Gansicke, Edward M. Sion, F. H. Cheng, Friend M. T., Gansicke B. T., Janet Mattei, Min Huang, Paula Szkody, Warren Sparks   +8 more
core   +2 more sources

Observations of Southern Dwarf Novae [PDF]

International Astronomical Union Colloquium, 1979
Preliminary results of spectroscopic and photometric data for five dwarf novae are presented : 1) V 436 Cen. The orbital period of 0.0669 days was determined from radial velocity variations. The RV half amplitude of the primary, K1. = 159 km/s, implies very small masses of M1 ≲ 0.20 M⊙ and M2 = 0.18 M⊙ for the binary components.2) Z Cha. Broad emission
openaire   +1 more source

Physiological roles of lignins – tuning cell wall hygroscopy and biomechanics

New Phytologist, Volume 248, Issue 6, Page 2674-2706, December 2025.
Summary Lignins constitute the second most abundant carbon‐storing biopolymers in the biosphere. These phenolic polymers accumulate in different concentrations, compositions, and localisations within and between cell wall layers and cell types. Lignins were acquired during plant terrestrialisation 450 million years ago, and the diversification of their
Edouard Pesquet, Igor Cesarino, Shinya Kajita, Katharina Pawlowski   +3 more
wiley   +1 more source

Mass-transfer Outbursts Reborn: Modeling the Light Curve of the Dwarf Nova EX Draconis

The Astrophysical Journal
EX Draconis is an eclipsing dwarf nova that shows outbursts with moderate amplitude (≃2 mag) and a recurrence timescale of ≃20–30 days. Dwarf novae outbursts are explained in terms of either a thermal-viscous instability in the disc or an instability in ...
Wagner Schlindwein, Raymundo Baptista
doaj   +1 more source

Low heat conduction in white dwarf boundary layers?

, 2008
X-ray spectra of dwarf novae in quiescence observed by Chandra and XMM-Newton provide new information on the boundary layers of their accreting white dwarfs.
Asai, Asai, Belloni, Brandenburg, Chandran, E. Meyer-Hofmeister, Ettori, F. K. Liu, F. Meyer, Ghizzardi, Goldreich, Hartmann, Hirose, Jansen, Liu, Liu, Markevitch, Medvedev, Medvedev, Meyer, Meyer, Meyer, Meyer-Hofmeister, Meyer-Hofmeister, Mukai, Narayan, Narayan, Pandel, Pandel, Perna, Ramsay, Ramsay, Rechester, Sasonov, Sharma, Shmeleva, Strüder, Sutherland, Turner, V. Burwitz, van der Woerd, Vikhlinin, Voigt, Xiang, Zakamska   +44 more
core   +1 more source

Synthetic NLTE accretion disc spectra for the dwarf nova SS Cyg during an outburst cycle

, 2007
Dwarf nova outbursts result from enhanced mass transport through the accretion disc of a cataclysmic variable system. We assess the question of whether these outbursts are caused by an enhanced mass transfer from the late-type main sequence star onto ...
Bath, Clarke, Faulkner, Hessman, K. Werner, Long, Lynden-Bell, M. Kromer, Martinez-Pais, Martinez-Pais, Meyer, Nagel, Osaki, Plavec, Ritter, Shakura, Smak, T. Nagel, Unda-Sanzana, Wood   +19 more
core   +1 more source