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Magnetic Activity of Pre-main Sequence Stars near the Stellar-Substellar Boundary

Published online by Cambridge University Press:  27 January 2016

David Principe ,
Joel. H. Kastner  and
David Rodriguez
David Principe
Affiliation:
Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Santiago, Chile email: [email protected] Millennium Nucleus Protoplanetary Disks, Chile
Joel. H. Kastner
Affiliation:
Center for Imaging Science, School of Physics & Astronomy, and Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NY 14623, USA
David Rodriguez
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
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Abstract

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X-ray observations of pre-main sequence (pre-MS) stars of M-type probe coronal emission and offer a means to investigate magnetic activity at the stellar-substellar boundary. Recent observations of main sequence (MS) stars at this boundary display a decrease in fractional X-ray luminosity (LX/Lbol) by almost two orders of magnitude for spectral types M7 and later. We investigate magnetic activity and search for a decrease in X-ray emission in the pre-MS progenitors of these MS stars. We present XMM-Newton X-ray observations and preliminary results for ~10 nearby (30-70 pc), very low mass pre-MS stars in the relatively unexplored age range of 10-30 Myr. We compare the fractional X-ray luminosities of these 10-30 Myr old stars to younger (1-3 Myr) pre-MS brown dwarfs and find no dependence on spectral type or age suggesting that X-ray activity declines at an age later than ~30 Myr in these very low-mass stars.

Keywords

Stars: formationStars: magnetic fieldStars: late-typeX-rays: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S314: Young Stars & Planets Near the Sun , November 2015 , pp. 126 - 127
Copyright
Copyright © International Astronomical Union 2016 

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