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

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

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

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 languageEnglish
Title of host publicationYoung stars and planets near the Sun
Subtitle of host publicationproceedings of the 314th Symposium of the International Astronomical Union held in Atlanta, Georgia, USA, May 11-15, 2015
EditorsJoel H. Kastner, Beate Stelzer, Stanimir Metchev
Place of PublicationCambridge
PublisherCambridge University Press
Pages58-62
Number of pages5
ISBN (Print)9781107138162
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event314th Symposium of the International Astronomical Union - Atlanta, United States
Duration: 11 May 201515 May 2015

Publication series

NameProceedings of the International Astronomical Union
PublisherCambridge University Press
NumberS314
Volume10
ISSN (Print)1743-9213

Conference

Conference314th Symposium of the International Astronomical Union
CountryUnited States
CityAtlanta
Period11/05/1515/05/15

Keywords

  • circumstellar matter
  • open clusters and associations: individual (Sco-Cen)
  • stars: low-mass
  • stars: pre-main sequence

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