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X-Ray Flaring on the dMe Star, Ross 154
B. J. Wargelin, V. L. Kashyap, J. J. Drake +2
We present results from two Chandra imaging observations of Ross 154, a nearby flaring M dwarf star. During a 61-ks ACIS-S exposure, a very large flare occurred (the equivalent of…
EBIT Charge-Exchange Measurements and Astrophysical Applications
B. J. Wargelin, P. Beiersdorfer, G. V. Brown
The past decade has seen a surge of interest in astrophysical charge exchange (CX). The impetus was the discovery of X-ray emission from comets in 1996, soon followed by the observ…
Bayesian Estimation of Hardness Ratios: Modeling and Computations
Taeyoung Park, Vinay L. Kashyap, Aneta Siemiginowska +4
A commonly used measure to summarize the nature of a photon spectrum is the so-called Hardness Ratio, which compares the number of counts observed in different passbands. The hardn…
Charge Exchange Spectra of Hydrogenic and He-like Iron
B. J. Wargelin, P. Beiersdorfer, P. A. Neill +2
We present H-like Fe XXVI and He-like Fe XXV charge-exchange spectra resulting from collisions of highly charged iron with N2 gas at an energy of 10 eV/amu in an electron beam ion…
An Assessment of the Fe XVIII and Fe XIX Line Ratios from the Chandra Grating Observations of Capella
P. Desai, N. S. Brickhouse, J. J. Drake +8
Observations of Fe XVIII and Fe XIX X-ray, EUV, and FUV line emission, formed at the peak of Capella's (alpha Aurigae) emission measure distribution and ubiquitous in spectra of ma…
Chandra Observations of MBM12 and Models of the Local Bubble
R. K. Smith, R. J. Edgar, P. P. Plucinsky +3
Chandra observations toward the nearby molecular cloud MBM12 show unexpectedly strong and nearly equal foreground O VIII and O VII emission. As the observed portion of MBM12 is opt…