The Gaia 20 pc white dwarf sample
نویسندگان
چکیده
منابع مشابه
L-dwarf Binaries in the 20-parsec Sample∗
We have used the NICMOS NIC1 camera on the Hubble Space Telescope to obtain high-resolution near-infrared images of 27 nearby ultracool dwarfs with formal distance estimates less than 20 parsecs. One target, 2MASS J22551861-5713056, is resolved as a binary system, with a 4:1 flux ratio in the F110W passband. The primary has spectral type L6, and the revised spectroscopic parallax places it at a...
متن کاملSe p 20 05 MID - INFRARED OBSERVATIONS OF THE WHITE DWARF BROWN DWARF BINARY GD 1400
Fluxes are measured for the DA white dwarf plus brown dwarf pair GD 1400 with the Infrared Array Camera on the Spitzer Space Telescope. GD 1400 displays an infrared excess over the entire 3 − 8µm region consistent with the presence of a mid-to late-type L dwarf companion. A discussion is given regarding current knowledge of this unique system.
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The current status of the problem of whether neutron stars can form, in close binary systems, by accretion{induced collapse (AIC) of white dwarfs is examined. We nd that, in principle, both initially cold C+O white dwarfs in the high{mass tail of their mass distribution in binaries and O+Ne+Mg white dwarfs can produce neutron stars. Which fractions of neutron stars in diierent types of binaries...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2018
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sty2057