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The Astronomical Journal Volume 121 Number 3 Create an alert RSS this journal

I. Neill Reid et al. 2001 The Astronomical Journal 121 1710 doi:10.1086/319418

Near-Infrared Spectral Classification of Late M and L Dwarfs

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I. Neill Reid1, A. J. Burgasser2, K. L. Cruz1, J. Davy Kirkpatrick3 and J. E. Gizis4

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Abstract References Cited By

We present near-infrared (1–2.5 μm), low-resolution spectroscopy of 11 ultracool dwarfs, with spectral types ranging from M7 to L8. Combining our observations with data published by Leggett et al. in 2001, we have measured equivalent widths for the strongest atomic features and constructed narrowband indices to gauge the strength of the strongest molecular features. Those measurements show that the behavior at near-infrared wavelengths is well correlated with spectral type, where the latter is defined from observations between 6300 and 10000 Å. In particular, four indices designed to measure absorption in the wings of the 1.4 and 1.85 μm steam bands exhibit a linear, monotonic correlation with spectral type on the Kirkpatrick et al. system (published in 1999), allowing consistent calibration from both optical and near-infrared spectroscopy.


Keywords

stars: late-type; stars: low-mass, brown dwarfs


Dates

Issue 3 (2001 March)

Received 2000 November 11, accepted for publication 2000 December 5



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