منابع مشابه
Rotational Velocities of Very Low Mass Binaries
We present rotational velocities for individual components of eleven very low mass (VLM) binaries with spectral types between M7.5 and L4. These results are based on observations taken with the near-infrared spectrograph, NIRSPEC, and the Keck II laser guide star adaptive optics (LGS AO) system. The binaries were targeted as part of a dynamical mass program, and their orbital inclinations are u...
متن کاملThe LuckyCam survey for very low mass binaries – II. 13 new M4.5–M6.0 binaries
We present results from a high angular resolution survey of 77 very low mass (VLM) binary systems with 6.0 V − K colour 7.5 and proper motion 0.15 arcsec yr−1. 21 VLM binaries were detected, 13 of them new discoveries. The new binary systems range in separation between 0.18 and 1.3 arcsec. The distance-corrected binary fraction is 13.6+6.5 −4 per cent, in agreement with previous results. Nine o...
متن کاملDiscovery of Five Very Low Mass Close Binaries, Resolved in the Visible with Lucky Imaging
We survey a sample of 32 M5-M8 stars with distance < 40pc for companions with separations between 0.1” and 1.5” and with ∆mi < 5. We find five new binaries with separations between 0.15” and 1.1”, including a candidate brown dwarf companion. The raw binary fraction is 16+8 −4% and the distance bias corrected fraction is 7 +7 −3%, for companions within the surveyed range. No systems with contras...
متن کاملA Survey for Spectroscopic Binaries among Very Low Mass Stars
We report on the results of a survey for radial velocity variability in a heterogeneous sample of very low mass stars and brown dwarfs. One distinguishing characteristic of the survey is its time span, which allows an overlap between spectroscopic binaries and those that can be found by high angular resolution imaging. Despite our relatively low velocity precision, we are able to place a new co...
متن کاملSuperhumps in Low–Mass X–Ray Binaries
We propose a mechanism for the superhump modulations observed in optical photometry of at least two black hole X-ray transients (SXTs). As in extreme mass–ratio cataclysmic variables (CVs), superhumps are assumed to result from the presence of the 3:1 orbital resonance in the accretion disc. This causes the disc to become non–axisymmetric and precess. However the mechanism for superhump luminos...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066120