The Astronomical Journal

The Astronomical Journal

Quick search Find article
Quick search
Find article
The Astronomical Journal Volume 132 Number 6 Create an alert RSS this journal

Andrew A. West et al. 2006 The Astronomical Journal 132 2507 doi:10.1086/508652

Using the Galactic Dynamics of M7 Dwarfs to Infer the Evolution of Their Magnetic Activity

FREE ISSUE

Andrew A. West1,2, John J. Bochanski2, Suzanne L. Hawley2, Kelle L. Cruz3, Kevin R. Covey2, Nicole M. Silvestri2, I. Neill Reid4 and James Liebert5

Show affiliations

Tag this article Full text PDF (393 KB) View as HTML

Abstract References Cited By

We present a spectroscopic study and dynamical analysis of ~2600 M7 dwarfs. We confirm our previous finding that the fraction of magnetically active stars decreases with vertical distance from the Galactic plane. We also show that the mean luminosity of the Hα emission has a small but statistically significant decrease with distance. Using space motions for ~1300 stars and a simple one-dimensional dynamical simulation, we demonstrate that the drop in the activity fraction of M7 dwarfs can be explained by thin disk dynamical heating and a rapid decrease of magnetic activity at a mean stellar age of ~6-7 Gyr.


Keywords

Galaxy: kinematics and dynamics; Galaxy: structure; solar neighborhood; stars: activity; stars: late-type; stars: low-mass, brown dwarfs


Dates

Issue 6 (2006 December)

Received 2006 June 30, accepted for publication 2006 August 25

Published 2006 November 1



Your last 10 viewed
  1. Using the Galactic Dynamics of M7 Dwarfs to Infer the Evolution of Their Magnetic Activity

    Andrew A. West et al. 2006 The Astronomical Journal 132 2507

  2. Low-Luminosity Extragalactic Water Masers toward M82, M51, and NGC 4051

    Yoshiaki Hagiwara 2007 The Astronomical Journal 133 1176

  3. A Possible Period for the K-Band Brightening Episodes of GX 17+2

    Jillian Bornak et al 2009 ApJ 701 L110

  4. Doping-dependent phase diagram of LaOMAs (M=V–Cu) and electron-type superconductivity near ferromagnetic instability

    G. Xu et al 2008 EPL 82 67002

  5. Different Power-Law Indices in the Frequency Distributions of Flares with and without Coronal Mass Ejections

    S. Yashiro et al 2006 ApJ 650 L143

  6. Software package for structure analysis of quasicrystals

    Akiji Yamamoto 2008 Sci. Technol. Adv. Mater. 9 013001

  7. Unusual "Stunted" Outbursts in Old Novae and Nova-like Cataclysmic Variables

    R. K. Honeycutt et al. 1998 The Astronomical Journal 115 2527

  8. Investigation of the closure and simplified Green's function approximations in second-order distorted-wave calculations for the (e, 2e) processes

    Zhangjin Chen et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2333

  9. In-beam and decay spectroscopy of very neutron deficient iridium nuclei

    C Scholey et al 2005 J. Phys. G: Nucl. Part. Phys. 31 S1719

  10. VLBI Images of 49 Radio Supernovae in Arp 220

    Colin J. Lonsdale et al. 2006 ApJ 647 185

Users also read

What's this?
This innovative new feature generates a list of articles 'also read' by other users based on them reading the original article. Article abstracts citations and references are all considered and weighted accordingly. We hope that this will help you find relevant papers for your research.

  1. Spectroscopic Survey of M Dwarfs within 100 Parsecs of the Sun
  2. The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog. I. Data
  3. A First Look at Rotation in Inactive Late-Type M Dwarfs
More

Share

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.