Chandra X-ray observations revealed the presence of cold fronts – sharp contact discontinuities between gas regions with different temperatures and densities – in the centers of many, if not most, relaxed clusters with cool cores. We use high-resolution simulations of idealized cluster mergers to address the origin of such fronts. Typical observed gas density and temperature profiles are used a...

A preliminary BV RIJHK analysis of the white dwarfs SSSPM J2231−7514 and SSSPM J2231−7515 is presented. Although both stars were reported to have Teff < 4000 K, the analysis here indicates Teff ≈ 4250 K for both SSSPM J2231−7514 and SSSPM J2231−7515. Given substantial scientific interest in the coolest extant degenerate stars, it is necessary to distinguish sub 4000 K objects from the bulk of c...

Fires have occurred throughout history, including those associated with the meteoroid impact at the Cretaceous-Palaeogene (K-Pg) boundary that eliminated many vertebrate species. To evaluate the recent hypothesis that the survival of the K-Pg fires by ancestral mammals was dependent on their ability to use energy-conserving torpor, we studied body temperature fluctuations and activity of an egg...

Recent developments in the study of radio emission from cool stars are reviewed. The eld of stellar radio astronomy would barely exist if active cool stars were similar to the Sun. However, many active stars appear to be fundamentally diierent from the Sun in that they possess a nonthermal corona which produces strong and steady radio emission. That is, in addition to the thermal populations at...

Several species of freshwater turtles spend the winter submerged in ice-covered lakes in a state of severe metabolic depression. It has been proposed that the hibernating turtles are comatose and entirely unresponsive, which raises the question of how they detect the arrival of spring and whether they respond to sensory information during hibernation. Using evoked potential studies in cold hypo...

In adaption to shifts in ambient temperature, both prokaryotic and eukaryotic cells maintain physiological homeostasis by adjusting various cellular properties, including membrane lipid fluidity, the capacity to maintain proteostasis and rate of protein synthesis [1]. How cells respond to temperature changes is a fundamental question in cell physiology. Here we briefly review current understand...

The CHORUS Object Oriented Layer (COOL) is a layer built above the CHORUS micro-kernel designed to extend the micro-kernel abstractions with support for object oriented systems. COOL-2, the second iteration of this layer provides generic support for clusters of objects, in a distributed virtual memory model. We discuss experiences with COOL-1 that have led to our current model and in particular...

The photometric U orbital variations of the symbiotic binary AG Dra, caused by occultation of a bright gaseous region by the K giant in this system, are used to derive the emission from the circumbinary nebula, that is supposed to be generated by the cool giant’s wind. Assuming spherical symmetry and constant expansion velocity for the wind, and that the giant has the same intrinsic continuum e...

NOISE STATISTICS & PERCEIVED LOUDNESS .............................................................................. 4 NOISE SPECTRUMS ..................................................................................................................... 5 No noise shaping (TPDF dithering)..................................................................................... 5 Cool Edit (C1 curve) ...