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A Mass Measurement for the Missing Baryons in the Warm-Hot Intergalactic Medium via the X-ray Forest
F. Nicastro, S. Mathur, M. Elvis +7
Recent Cosmological measurements indicate that baryons comprise about four percent of the total mass-energy density of the Universe, which is in accord with the predictions arising…
Turning cool star X-ray spectra upside down
K. Werner, J. J. Drake
H1504+65 is a young white dwarf with an effective temperature of 200,000 K and is the hottest post-AGB star ever analysed with detailed model atmospheres. Chandra LETG+HRC-S spectr…
High Resolution X-ray Spectroscopy of Pre-Main-Sequence Stars: TWA 5 and PZ Tel
C. Argiroffi, J. J. Drake, F. R. Harnden +5
We report on the analysis of high resolution X-ray spectra of two pre-main-sequence stars: TWA 5 (observed with XMM-Newton) and PZ Telescopii (observed with Chandra/HETGS). TWA 5 i…
X-ray spectroscopy of the unsteady quiescent corona of AD Leo with Chandra
A. Maggio, J. J. Drake, V. Kashyap +4
We present the analysis and interpretation of an observation of the flare star AD Leo (dM3e) with Chandra/LETG. The high resolution X-ray spectrum allowed us to infer the plasma em…
Detection of X-ray Resonance Scattering in Active Stellar Coronae
Paola Testa, Jeremy J. Drake, Giovanni Peres +1
An analysis of Lyman series lines arising from hydrogen-like oxygen and neon ions in the coronae of the active RS CVn-type binaries II Peg and IM Peg, observed using the {\it Chand…
The Density of Coronal Plasma in Active Stellar Coronae
Paola Testa, Jeremy J. Drake, Giovanni Peres
We have analyzed high-resolution X-ray spectra of a sample of 22 active stars observed with the High Energy Transmission Grating Spectrometer on {\em Chandra} in order to investiga…