منابع مشابه
A Very Low-luminosity, Very Cool, Dc White Dwarf
The star LHS 3250 is found to be a white dwarf at a distance of 30 pc. Its absolute magnitudes (MV = 15.72; Mbol = 16.2) put it among the least-luminous white dwarfs known. Its optical spectrum shows no features, indicating it has a DC classification, and it shows no detectable polarization, indicating it does not have a very strong magnetic field. However, its broadband colors show it to have ...
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TRPV and TRPM proteins have been shown to form temperature-responsive cation channels that act in nociception. Recent work on the mouse ANKTM1 and Drosophila Painless proteins shows that members of a third TRP subfamily, TRPN, also function in thermosensation.
متن کاملModel Atmosphere Analysis of Two Very Cool White Dwarfs
A detailed analysis of the very cool white dwarfs SDSS 1337+00 and LHS 3250 is presented. Model atmosphere calculations with improved collision-induced absorptions by molecular hydrogen indicate that a pure hydrogen composition can be ruled out, and that the strong infrared absorption observed in these cool stars is better explained in terms of collisions of H 2 with neutral helium. It is shown...
متن کاملPhysical Parameters of Two Very Cool T Dwarfs
We present new infrared spectra of the T8 brown dwarf 2MASS J04151954 0935066: 2.9–4.1 m spectra obtained with the Infrared Camera and Spectrograph on the Subaru Telescope, and 5.2–14.5 m spectra obtained with the Infrared Spectrograph on the Spitzer Space Telescope. We use these data and models to determine an accurate bolometric luminosity of log Lbol /L 1⁄4 5:67 and to constrain the effectiv...
متن کاملPure Hydrogen Model Atmospheres for Very Cool White Dwarfs
Microlensing events observed in the line of sight toward the LMC indicate that a significant fraction of the mass of the dark halo of the Galaxy is probably composed of white dwarfs. In addition, white dwarf sequences have now be observed in the HR diagrams of several globular clusters. Because of the unavailability of white dwarf atmospheres for Teff < 4000K, cooling time scales for white dwar...
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ژورنال
عنوان ژورنال: Microscopy Today
سال: 2005
ISSN: 1551-9295,2150-3583
DOI: 10.1017/s1551929500053918