Meeting the neighbours: NStars and 2MASS

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The Ultracool sample: II. The intermediate sources

Cross-referencing the sources

Theses 100 sources fall between the giant-dominated sample of the brightest 2MASS sources and the dwaf-dominated fainter targets. Cross-referencing against SIMBAD leads to the identification of 21 sources. The majority are evolved giants - carbon stars and AGB stars - but the sample also includes the nearby dwarfs, GJ 2005 and GJ 3877, and two T Tauri stars (HW Lupi and SZ 66). One source is actually NGC 3251.

Figure b1.1: The (RA, Dec), (J, (J-K)) and (J-H)/(H-K) distributions of the 100 sources at intermediate (J, K) magnitudes. The green circles in the JHK diagram plot data for known L dwarfs; the magneta points are known T Tauris or evolved stars in the intermediate sample.

Figure b1.1 plots the (RA, Dec) and colour-magnitude distributions for the sample. Most are grouped near the Galactic Plane, particularly in the southern regions around the Galactic Bulge. Follow-up spectrscopy of approximately half the sample from CTIO confirms most as evolved stars. Figure b1.2 plots relevant data for the 34 stars which currently lack either identifications or spectroscopic observations from this sample.

Figure b1.2: The (RA, Dec), (J, (J-K)) and (J-H)/(H-K) distributions of the remaining targets in the intermediate sample.

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page by Neill Reid, last updated 1/03/2002