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Title:
Meeting the Cool Neighbors. VI. A Search for Nearby Ultracool Dwarfs in the Galactic Plane
Authors:
Reid, I. Neill
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; and Department of Physics and Astronomy, University of Pennsylvania, 209 South 33d Street, Philadelphia, PA 19104 )
Publication:
The Astronomical Journal, Volume 126, Issue 5, pp. 2449-2461. (AJ Homepage)
Publication Date:
11/2003
Origin:
UCP
Astronomy Keywords:
Galaxy: Stellar Content, Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function
DOI:
10.1086/378907
Bibliographic Code:
2003AJ....126.2449R

Abstract

Surveys for nearby low-luminosity dwarfs tend to avoid the crowded regions of the Galactic plane. We have devised near-infrared color-magnitude and color-color selection criteria designed to identify late-type M and early-type L dwarfs within 12 pc of the Sun. We use those criteria to search for candidates within the regions of the Galactic plane (|b|<10°) covered by the Second Incremental Data Release from the Two Micron All Sky Survey. Detailed inspection of the available photographic images of the resulting 1299 candidates confirms only two as ultracool dwarfs. Both are known proper-motion stars, identified in the recent survey by Lépine et al. Despite the low numbers, the inferred surface density is consistent with comparable surveys at higher latitudes. We discuss the implications for the luminosity function and consider means of improving the efficiency and scope of photometric surveys in the plane.

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