The Solar Neighborhood.III.A Near-Infrared Search for Widely Separated Low-Mass Binaries

Details The Solar Neighborhood.III.A Near-Infrared Search for Widely Separated Low-Mass Binaries The Solar Neighborhood.III.A Near-Infrared Search for Widely Separated Low-Mass Binaries

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.2238s&link_type=abstract

Astronomical Journal v.112, p.2238

Astronomy and Astrophysics

Astronomy

24

Solar Neighborhood, Stars: Low-Mass, Binaries: General

Scientific paper

A near-infrared survey designed to detect widely separated, very low-mass companions to M dwarfs within 8 pc is described. This survey is unique in that it is sensitive to companions with separations of 100-1400 AU from primaries and with masses down to the 0.03 Msunlevel, thereby sampling rarely explored parameter space. In Phase I of this program, described here, candidate stellar and brown dwarf companions are identified by creating color-magnitude plots of all detected point sources in the fields surrounding primaries and searching for objects that are bright enough to be stellar (Mj≤11) or that fall close to theoretical brown dwarf isochrones like GD 165B (Mj˜13). Common proper motion and spectroscopic checks are used to screen candidates. To date, all candidates for which we have made follow-up observations have been identified as background sources and no new low mass stellar or brown dwarf candidates have emerged from this survey. Phase II of this program will include a search for common proper motion between primaries and all field objects to Mj˜ 17.5, allowing identification of widely separated substellar components, including objects like GL 229B.

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