Discovery of the benchmark metal-poor T8 dwarf BD +01° 2920B
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چکیده
منابع مشابه
Boron in the very metal - poor star BD − 13 3442 ?
The Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST) has been used to observe the boron 2500 Å region of BD −13 3442. At a metallicity of [Fe/H]=−3.00 this is the most metal-poor star ever observed for B. Nearly 26 hours of exposure time resulted in a detection. Spectrum synthesis using the latest Kurucz model atmospheres yields an LTE boron abundance of log (B)= ...
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We report high-resolution, high-signal-to-noise, observations of the extremely metal-poor double-lined spectroscopic binary CS 22876–032. The system has a long period : P = 424.7 ± 0.6 days. It comprises two main sequence stars having effective temperatures 6300 K and 5600 K, with a ratio of secondary to primary mass of 0.89 ± 0.04. The metallicity of the system is [Fe/H] = –3.71 ± 0.11 ± 0.12 ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2012
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2012.20549.x