منابع مشابه
07B02_Dynastron-WD WHTpaper
• The Toshiba DynastronWD technology can extend dynamic range of a CMOS image sensor up to 96dB. It is a critical capability in today’s highly competitive camera phone market. Introduction There is explosive growth in the integration of cameras into mobile phones with consumers demanding both high pixel count and high image quality. To date, image sensor vendors have focused on delivering low-l...
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WD1704+481 is a visual binary in which both components are white dwarfs. We present spectra of the Hα line of both stars which show that one component (WD1704+481.2 = Sanduleak B = GR577) is a close binary with two white dwarf components. Thus, WD1704+481 is the first known triple degenerate star. From radial velocity measurements of the close binary we find an orbital period of 0.1448d, a mass...
متن کاملsdB+WD binary with a pulsating subdwarf
The recently discovered subdwarf B (sdB) pulsator KIC 11558725 is one of the 16 pulsating sdB stars detected in the Kepler field. It features a rich g-mode frequency spectrum, with a few low-amplitude p-modes at short periods. This makes it a promising target for a seismic study aiming to constrain the internal structure of this star, and of sdB stars in general. We have obtained ground-based s...
متن کاملA Model of the Local WD Population
We present a model of the solar neighbourhood (d<100 pc) white dwarf (WD) population and show its distribution in effective temperature and mass. The WDs are created by the death-rate of a population model matching the local stars observed by hipparcos, considering depletion as caused by the “thin disk” dynamics. For verification of our synthetic sample, we study the temperature distribution of...
متن کاملTrinity Hamilton
The metalloenzyme nitrogenase is utilized by microbial diazotrophs to accomplish the majority of biological nitrogen fixation. Many different forms of the enzyme nitrogenase are known to exist. They are categorized by the type of metal cluster providing the N2-binding site, which is also the active site of the enzyme. The nitrogenase best-characterized to date has an active site with the compos...
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ژورنال
عنوان ژورنال: Nature Medicine
سال: 2000
ISSN: 1078-8956,1546-170X
DOI: 10.1038/74607