Results 11 to 20 of about 10,468 (212)

A Geologic Si‐O‐C Pathway to Incorporate Carbon in Silicates

open access: yesGeophysical Monograph Series, Page 47-54., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Alexandra Navrotsky   +2 more
wiley  

+1 more source

Cataclysmic Variable Stars [PDF]

open access: yesInternational Astronomical Union Colloquium, 1984
AbstractThe properties of cataclysmic variable outbursts are reviewed, and interpreted in terms of dynamical instabilities by the red component, and subsequent evolution of the white dwarf accretion disc subject to a mass transfer burst in the transfer stream.
openaire   +1 more source

Gravitational Wave Emission by Cataclysmic Variables: numerical models of semi-detached binaries [PDF]

open access: yes, 2001
Gravitational wave emission is considered to be the driving force for the evolution of short-period cataclysmic binary stars, making them a potential test for the validity of General Relativity.
Rezzolla, Luciano   +2 more
core   +2 more sources

Cataclysmic Variable Stars [PDF]

open access: yesHighlights of Astronomy, 1998
The evolution of single stars on and away from the main sequence is well understood. A degenerate core is formed in a star as the star leaves the main sequence and expands to a giant with a radius typically 50 - 500 Ro . Observationally it is known that most stars are members of binary systems, and among these many have orbital periods less than 100 y.
openaire   +1 more source

Evolution of Negative Superhumps, Quasiperiodic Oscillations, and Outbursts in the Z Cam-type Dwarf Nova AH Her

open access: yesThe Astrophysical Journal, 2023
AH Her is a Z Cam-type dwarf nova with an orbital period of ∼0.258 days. Dwarf nova oscillations and long-period dwarf nova oscillations have been detected, but no quasiperiodic oscillations (QPOs) and negative superhumps (NSHs) have been found.
Qi-Bin Sun, Sheng-Bang Qian, Min-Yu Li
doaj   +1 more source

The donor stars of cataclysmic variables [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2006
Abstract We carefully consider observational and theoretical constraints on the global properties of secondary stars in cataclysmic variable stars (CVs). We then use these constraints to construct and test a complete, semi-empirical donor sequence for CVs with orbital periods Porb≤ 6 h.
openaire   +3 more sources

System parameters of three short-period cataclysmic variable stars [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2021
ABSTRACT Using photometric ULTRACAM observations of three new short-period cataclysmic variables (CVs), we model the primary eclipse light curves to extract the orbital separation, masses, and radii of their component stars. We find donor masses of $0.060\pm 0.008\, {\rm M_\odot }$, $0.042\pm 0.001\, {\rm M_\odot }$, and $0.042\pm 0.004\,
J F Wild   +11 more
openaire   +4 more sources

Optical Studies of Seven Bright Southern Cataclysmic Variable Stars

open access: yesThe Astronomical Journal, 2023
We report spectroscopic observations of seven bright southern cataclysmic variable stars, collected on a single two-week observing run using the 1.9 m Radcliffe telescope at the South African Astronomical Observatory.
John R. Thorstensen   +4 more
doaj   +1 more source

CCD Photometry Using Multiple Comparison Stars [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2004
The accuracy of CCD observations obtained at the Korean 1.8 m telescope has been studied. Seventeen comparison stars in the vicinity of the cataclysmic variable BG CMi have been measured.
Yonggi Kim   +2 more
doaj   +1 more source

Finding the most variable stars in the Orion Belt with the All Sky Automated Survey [PDF]

open access: yes, 2010
We look for high-amplitude variable young stars in the open clusters and associations of the Orion Belt. We use public data from the ASAS-3 Photometric V-band Catalogue of the All Sky Automated Survey, infrared photometry from the 2MASS and IRAS ...
Acke   +137 more
core   +3 more sources

Home - About - Disclaimer - Privacy