Structures of Binary Star Coronae

The Structure of Stellar Coronae in Active Binary

The Structure of Stellar Coronae in Active Binary Systems

A survey of 28 stars (22 active binary systems, plus 6 single stars or wide binaries for comparison) using extreme ultraviolet spectra has been conducted to establish the structure of stellar coronae in active binary systems from the emission measure distribution (EMD), electron densities, and scale sizes. Observations obtained by the Extreme Ultraviolet Explorer satellite (EUVE) during 9 years...

The Newly Active R Coronae Borealis Star, V2552 Oph

In 2001, V2552 Oph (CD -22 12017, HadV98) quickly faded by several magnitudes in a manner typical of the R Coronae Borealis (RCB) stars. Photometry of V2552 Oph obtained over 70 years previous to 2001 shows no indication of variability. Optical spectra of this star subsequently confirmed that V2552 Oph is a member of the hydrogen deficient, carbon-rich RCB class of variables. It resembles the w...

Binary Star Measurements with the Star re

Four binaries, 10 UMa, UMa, 81 Cnc, and UMa, were observed with adaptive optics on the 3.5m telescope at the Starrre Optical Range on March 24, 1998, in order to investigate the relative photometry produced by adaptive optics within the isoplanatic patch. Iterative Blind Deconvolution (IBD) and Parametric Blind Deconvolution (PBD) techniques were used to post-process the data, and produced cons...

Binary Neutron Star Mergers

We review the current status of studies of the coalescence of binary neutron star systems. We begin with a discussion of the formation channels of merging binaries and we discuss the most recent theoretical predictions for merger rates. Next, we turn to the quasi-equilibrium formalisms that are used to study binaries prior to the merger phase and to generate initial data for fully dynamical sim...