From the 1 of 3.3k papers with an AI index.
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143 papers · 1 filter
Variability of Disk Emission in Pre-Main Sequence and Related Stars. I. HD 31648 and HD 163296 - Isolated Herbig Ae Stars Driving Herbig-Haro Flows
M. L. Sitko, W. J. Carpenter, R. L. Kimes +13
Infrared photometry and spectroscopy covering a time span of a quarter century are presented for HD 31648 (MWC 480) and HD 163296 (MWC 275). Both are isolated Herbig Ae stars that…
Infrared and X-Ray Evidence for Circumstellar Grain Destruction by the Blast Wave of Supernova 1987A
E. Dwek, R. G. Arendt, P. Bouchet +10
Multiwavelength observations of supernova remnant (SNR) 1987A show that its morphology and luminosity are rapidly changing at X-ray, optical, infrared, and radio wavelengths as the…
Planar Limit of Orientifold Field Theories and Emergent Center Symmetry
Adi Armoni, Mikhail Shifman, Mithat Unsal
We consider orientifold field theories (i.e. SU(N) Yang--Mills theories with fermions in the two-index symmetric or antisymmetric representations) on R3xS1 where the compact dimens…
On the "degrees of freedom" of the lasso
Hui Zou, Trevor Hastie, Robert Tibshirani
We study the effective degrees of freedom of the lasso in the framework of Stein's unbiased risk estimation (SURE). We show that the number of nonzero coefficients is an unbiased e…
X-Atlas: An Online Archive of Chandra's Stellar High Energy Transmission Gratings Observations
Owen W. Westbrook, Nancy Remage Evans, Scott J. Wolk +6
The high-resolution X-ray spectroscopy made possible by the 1999 deployment of the Chandra X-ray Observatory has revolutionized our understanding of stellar X-ray emission. Many pu…
The sorting order on a Coxeter group
Drew Armstrong
Let be an arbitrary Coxeter system. For each word in the generators we define a partial order--called the {\sf -sorting order}--on the set of group elements $W_ω\sub…