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Evidence for Accretion: High-Resolution X-Ray Spectroscopy of the Classical T Tauri Star TW Hydrae
We present high-resolution X-ray spectra of the X-ray-bright classical T Tauri star, TW Hydrae, covering the wavelength range of 1.5-25 A. The differential emission measure derived from fluxes of…
Asymmetrical Planetary Nebulae II: From Origins to Microstructures
X-ray and molecular emission from the nearest region of recent star formation.
Being at least three times closer to Earth than any well-studied region of star formation, the TW Hya Association serves as a test-bed for the study of x-ray emission from young stars and the formation of planetary systems around sunlike stars.
Inhibition of giant-planet formation by rapid gas depletion around young stars
Observations of the molecular gas surrounding 20 stars whose ages are likely to be in this range are reported, finding that the gas dissipates rapidly; after a few million years the mass remaining is typically much less than the mass of Jupiter.
Chandra Orion Ultradeep Project: Observations and Source Lists
We present a description of the data reduction methods and the derived catalog of more than 1600 X-ray point sources from the exceptionally deep 2003 January Chandra X-Ray Observatory (Chandra)…
Chandra ACIS Subpixel Event Repositioning: Further Refinements and Comparison between Backside- and Frontside-illuminated X-Ray CCDs
We further investigate subpixel event repositioning (SER) algorithms in application to Chandra X-Ray Observatory (Chandra) CCD imaging. SER algorithms have been applied to backside-illuminated (BI)…
H 2 Emission from Planetary Nebulae: Signpost of Bipolar Structure
The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission
This White Paper, submitted to the recent ESA call for science themes to define its future large missions, advocates the need for a transformational leap in our understanding of two key questions in…
DISK IMAGING SURVEY OF CHEMISTRY WITH SMA. II. SOUTHERN SKY PROTOPLANETARY DISK DATA AND FULL SAMPLE STATISTICS
This is the second in a series of papers based on data from DISCS, a Submillimeter Array observing program aimed at spatially and spectrally resolving the chemical composition of 12 protoplanetary…
Variation in the near-infrared surface brightness distribution of the bipolar nebula OH 231.8 + 4.2
- J. Kastner, D. Weintraub, B. Zuckerman, E. Becklin, I. McLean, I. Gatley
- Physics, Geology
- 1 October 1992
Near-infrared images of the bipolar nebula OH 231.8+4.2 obtained over a 3 yr period suggest that its surface brightness distribution varies with time. A model in which the variations are explained by…