SIMBAD references

2006MNRAS.368.1917L - Mon. Not. R. Astron. Soc., 368, 1917-1924 (2006/June-1)

Discovery of five very low mass close binaries, resolved in the visible with lucky imaging.


Abstract (from CDS):

We survey a sample of 32 M5-M8 stars with distance <40pc for companions with separations between 0.1 and 1.5arcsec and with Δmi≤ 5. We find five new binaries with separations between 0.15 and 1.1arcsec, including a candidate brown dwarf companion. The raw binary fraction is 16+8–4 per cent and the distance bias corrected fraction is 7+7–3per cent, for companions within the surveyed range. No systems with contrast ratio Δmi> 1 were found, even though our survey is sensitive to Δm ≤ 5 (well into the brown dwarf regime). The distribution of orbital radii is in broad agreement with previous results, with most systems at 1-5au, but one detected binary is very wide at 46.8±5.0au. We also serendipitously imaged for the first time a companion to Ross 530, a metal-poor single-lined spectroscopic binary. We used the new Lucky Imaging system, LuckyCam, on the 2.5-m Nordic Optical Telescope to complete the 32 very low mass star Sloan Digital Sky Survey (SDSS) i' and z' survey in only 5h of telescope time.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): instrumentation: high angular resolution - methods: observational - techniques: high angular resolution - binaries: close - stars: low-mass, brown dwarfs

Simbad objects: 10

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