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The luminosity function of low-mass stars and brown dwarfs

Record Type:	Electronic resources : Monograph/item
Title/Author:	The luminosity function of low-mass stars and brown dwarfs
Author:	Cruz, Kelle Lin.
Description:	176 p.
Notes:	Adviser: Iain Neill Reid.
Notes:	Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1364.
Contained By:	Dissertation Abstracts International65-03B.
Subject:	Physics, Astronomy and Astrophysics.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3125802
ISBN:	0496730916

The luminosity function of low-mass stars and brown dwarfs
Cruz, Kelle Lin.

The luminosity function of low-mass stars and brown dwarfs [electronic resource] - 176 p.

Adviser: Iain Neill Reid.

Thesis (Ph.D.)--University of Pennsylvania, 2004.

We present a search for low-mass stars and brown dwarfs in the Solar Neighborhood using the Two Micron All-Sky Survey (2MASS) Second Incremental Data Release. We have created a statistically robust, volume-limited sample of M7-L8 dwarfs within 20 pc of the Sun using near-infrared color-color and color-magnitude constraints. We detail the construction of this sample, dubbed 2MU2, and extensive, low-resolution far-red spectroscopic follow-up of candidates. These spectroscopic observations yield spectral type estimates which enable us to confirm candidates as nearby ultracool dwarfs. Spectral type is used as a predictor of MJ, which is combined with 2MASS J-band photometry to obtain spectrophotometric distances. In the course of this program, we have discovered of 261 late-M dwarfs and 94 L dwarfs---56 of these are within 20 pc, more than doubling the local census. We combine these data with previously known objects to make the first, statistically robust estimate the luminosity function of ultracool dwarfs in the Solar Neighborhood. This result is the first quantitative measurement of the turnaround in the luminosity function of ultracool dwarfs at faint magnitudes and is a confirmation of theoretical predictions. Finally, we discuss the implications of this work and our future prospects.

ISBN: 0496730916Subjects--Topical Terms:

227131
Physics, Astronomy and Astrophysics.

The luminosity function of low-mass stars and brown dwarfs
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520 # $a We present a search for low-mass stars and brown dwarfs in the Solar Neighborhood using the Two Micron All-Sky Survey (2MASS) Second Incremental Data Release. We have created a statistically robust, volume-limited sample of M7-L8 dwarfs within 20 pc of the Sun using near-infrared color-color and color-magnitude constraints. We detail the construction of this sample, dubbed 2MU2, and extensive, low-resolution far-red spectroscopic follow-up of candidates. These spectroscopic observations yield spectral type estimates which enable us to confirm candidates as nearby ultracool dwarfs. Spectral type is used as a predictor of MJ, which is combined with 2MASS J-band photometry to obtain spectrophotometric distances. In the course of this program, we have discovered of 261 late-M dwarfs and 94 L dwarfs---56 of these are within 20 pc, more than doubling the local census. We combine these data with previously known objects to make the first, statistically robust estimate the luminosity function of ultracool dwarfs in the Solar Neighborhood. This result is the first quantitative measurement of the turnaround in the luminosity function of ultracool dwarfs at faint magnitudes and is a confirmation of theoretical predictions. Finally, we discuss the implications of this work and our future prospects.
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