Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· arXiv e-print (arXiv:astro-ph/0512449)
· References in the article
· Citations to the Article (10) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (6)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Discovery of five very low mass close binaries, resolved in the visible with lucky imaging*
Authors:
Law, N. M.; Hodgkin, S. T.; Mackay, C. D.
Affiliation:
AA(Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA; ), AB(Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA; ), AC(Institute of Astronomy, Cambridge University, Madingley Road, Cambridge CB3 0HA; )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 368, Issue 4, pp. 1917-1924. (MNRAS Homepage)
Publication Date:
06/2006
Origin:
MNRAS
MNRAS Keywords:
instrumentation: high angular resolution , methods: observational , techniques: high angular resolution , binaries: close , stars: low-mass, brown dwarfs
DOI:
10.1111/j.1365-2966.2006.10265.x
Bibliographic Code:
2006MNRAS.368.1917L

Abstract

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+7-3 per 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.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints