منابع مشابه
Direct detection of the companion of χ 1 Orionis
We present an H-band image of the companion of χ Orionis taken with the Keck adaptive optic system and NIRC 2 camera equipped with a 300mas-diameter coronographic mask. The direct detection of this companion star enables us to calculate dynamical masses using only Kepler’s laws (MA = 1.01 ± 0.13M⊙, MB = 0.15 ± 0.02M⊙), and to study stellar evolutionary models at a wide spread of masses. The app...
متن کاملX - ray Emission near the Substellar Limit : The σ Orionis and Taurus Star Forming Regions
We have carried out an extensive search for X-ray emission from young, very low-mass objects near and beyond the substellar limit, making use of archived ROSAT PSPC and HRI observations pointed at Brown Dwarfs and Brown Dwarf candidates in the young σ Orionis and Taurus-Auriga associations. In σ Ori we identify three Brown Dwarf candidates with X-ray sources; in Taurus-Auriga we add one further...
متن کاملThe secondary star and distance of the polar V1309 Orionis
Context. The first phase-resolved JHK light curves of the eclipsing polar (AM Herculis binary) V1309 Ori are presented and interpreted. Aims. We separate the contributions from the secondary star and from other sources with the aim of determining a photometric distance. Methods. Simple model calculations show that the accretion stream and the cyclotron source on the accreting white dwarf are mi...
متن کاملX-ray Emission from the FU Orionis Star V1735 Cygni
The variable star V1735 Cyg (= Elias 1-12) lies in the IC 5146 dark cloud and is a member of the class of FU Orionis objects whose dramatic optical brightenings are thought to be linked to episodic accretion. We report the first X-ray detections of V1735 Cyg and a deeply-embedded class I protostar lying 24 to its northeast. X-ray spectra obtained with EPIC on XMM-Newton reveal very hightemperat...
متن کاملNew Zr II oscillator strengths and the zirconium conflict in the HgMn star χ Lupi
Lifetimes on the sub-nanosecond scale for the levels vD3/2, vF3/2 and vF5/2 in the 4d5s5p configuration in Zr II have been measured, using the method of laser-induced fluorescence. Combined with branching fractions obtained with the Lund Ultraviolet (UV) Fourier Transform Spectrometer (FTS), experimental oscillator strengths have been derived. From Hubble Space Telescope/Goddard High-Resolution...
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ژورنال
عنوان ژورنال: Nature
سال: 1886
ISSN: 0028-0836,1476-4687
DOI: 10.1038/033269a0