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New Low-mass Accretors in the Scorpius-Centaurus OB Association

Published online by Cambridge University Press:  27 January 2016

Simon J. Murphy ,
Warrick A. Lawson  and
Joao Bento
Simon J. Murphy
Affiliation:
Research School of Astronomy & Astrophysics, Australian National Unversity email: simon.murphy@anu.edu.au School of Physical, Environmental and Mathematical Sciences, University of New South Wales Canberra
Warrick A. Lawson
Affiliation:
School of Physical, Environmental and Mathematical Sciences, University of New South Wales Canberra
Joao Bento
Affiliation:
Research School of Astronomy & Astrophysics, Australian National Unversity email: simon.murphy@anu.edu.au
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Abstract

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We describe the serendipitous discovery of two new lithium-rich M5 members of the Scorpius-Centaurus OB Association (Sco-Cen). Both stars exhibit large 12 and 22 μm excesses and strong, variable Hα emission which we attribute to accretion from circumstellar discs. Such stars are thought to be incredibly rare at the ~16 Myr median age of much of Sco-Cen. The serendipitous discovery of two accreting stars hosting large quantities of circumstellar material may be indicative of a sizeable age spread in Sco-Cen, or further evidence that disc dispersal and planet formation time-scales are longer around lower-mass stars.

Keywords

circumstellar matteropen clusters and associations: individual (Sco-Cen)stars: low-massstars: pre-main sequence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S314: Young Stars & Planets Near the Sun , November 2015 , pp. 58 - 62
Copyright
Copyright © International Astronomical Union 2016 

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