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

Simon J. Murphy; Warrick A. Lawson; Joao Bento

doi:10.1017/S1743921315006031

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

Simon J. Murphy, Warrick A. Lawson, Joao Bento

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Abstract

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.

Original language	English
Pages (from-to)	58-62
Number of pages	5
Journal	Proceedings of the International Astronomical Union
Volume	10
DOIs	https://doi.org/10.1017/S1743921315006031
Publication status	Published - 2015

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title = "New Low-mass Accretors in the Scorpius-Centaurus OB Association",

abstract = "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 matter, open clusters and associations: individual (Sco-Cen), stars: low-mass, stars: pre-main sequence",

author = "Murphy, {Simon J.} and Lawson, {Warrick A.} and Joao Bento",

note = "Publisher Copyright: {\textcopyright} 2016 International Astronomical Union.",

year = "2015",

doi = "10.1017/S1743921315006031",

language = "English",

volume = "10",

pages = "58--62",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

}

TY - JOUR

T1 - New Low-mass Accretors in the Scorpius-Centaurus OB Association

AU - Murphy, Simon J.

AU - Lawson, Warrick A.

AU - Bento, Joao

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - circumstellar matter

KW - open clusters and associations: individual (Sco-Cen)

KW - stars: low-mass

KW - stars: pre-main sequence

UR - http://www.scopus.com/inward/record.url?scp=84956510575&partnerID=8YFLogxK

U2 - 10.1017/S1743921315006031

DO - 10.1017/S1743921315006031

M3 - Article

SN - 1743-9213

VL - 10

SP - 58

EP - 62

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

ER -

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

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