First detection of a low-mass stellar halo around the young open cluster η Chamaeleontis

Simon J. Murphy; Warrick A. Lawson; Michael S. Bessell

doi:10.1111/j.1745-3933.2010.00879.x

First detection of a low-mass stellar halo around the young open cluster η Chamaeleontis

Simon J. Murphy^*, Warrick A. Lawson, Michael S. Bessell

^*Corresponding author for this work

Research output: Contribution to journal › Letter › peer-review

26 Citations (Scopus)

Abstract

We have identified several lithium-rich low-mass (0.08 < M < 0.3 M_⊙) stars within 5°5 of the young open cluster η Chamaeleontis, nearly four times the radius of previous search efforts. Of these stars, we propose four new probable cluster members and three possible members requiring further investigation. These findings are consistent with a dynamical origin for the current configuration of the cluster, without the need to invoke an abnormal initial mass function deficient in low-mass objects. Candidates were selected on the basis of DENIS and Two-Micron All-Sky Survey photometry, Naval Observatory Merged Astrometric Catalogue astrometry and extensive follow-up spectroscopy.

Original language	English
Pages (from-to)	L50-L54
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	406
Issue number	1
DOIs	https://doi.org/10.1111/j.1745-3933.2010.00879.x
Publication status	Published - Jul 2010

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10.1111/j.1745-3933.2010.00879.x

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title = "First detection of a low-mass stellar halo around the young open cluster η Chamaeleontis",

abstract = "We have identified several lithium-rich low-mass (0.08 < M < 0.3 M⊙) stars within 5°5 of the young open cluster η Chamaeleontis, nearly four times the radius of previous search efforts. Of these stars, we propose four new probable cluster members and three possible members requiring further investigation. These findings are consistent with a dynamical origin for the current configuration of the cluster, without the need to invoke an abnormal initial mass function deficient in low-mass objects. Candidates were selected on the basis of DENIS and Two-Micron All-Sky Survey photometry, Naval Observatory Merged Astrometric Catalogue astrometry and extensive follow-up spectroscopy.",

keywords = "Open clusters and associations: individual: η Chamaeleontis, Stars: kinematics and dynamics, Stars: pre-main sequence",

author = "Murphy, {Simon J.} and Lawson, {Warrick A.} and Bessell, {Michael S.}",

year = "2010",

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doi = "10.1111/j.1745-3933.2010.00879.x",

language = "English",

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pages = "L50--L54",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

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T1 - First detection of a low-mass stellar halo around the young open cluster η Chamaeleontis

AU - Murphy, Simon J.

AU - Lawson, Warrick A.

AU - Bessell, Michael S.

PY - 2010/7

Y1 - 2010/7

N2 - We have identified several lithium-rich low-mass (0.08 < M < 0.3 M⊙) stars within 5°5 of the young open cluster η Chamaeleontis, nearly four times the radius of previous search efforts. Of these stars, we propose four new probable cluster members and three possible members requiring further investigation. These findings are consistent with a dynamical origin for the current configuration of the cluster, without the need to invoke an abnormal initial mass function deficient in low-mass objects. Candidates were selected on the basis of DENIS and Two-Micron All-Sky Survey photometry, Naval Observatory Merged Astrometric Catalogue astrometry and extensive follow-up spectroscopy.

AB - We have identified several lithium-rich low-mass (0.08 < M < 0.3 M⊙) stars within 5°5 of the young open cluster η Chamaeleontis, nearly four times the radius of previous search efforts. Of these stars, we propose four new probable cluster members and three possible members requiring further investigation. These findings are consistent with a dynamical origin for the current configuration of the cluster, without the need to invoke an abnormal initial mass function deficient in low-mass objects. Candidates were selected on the basis of DENIS and Two-Micron All-Sky Survey photometry, Naval Observatory Merged Astrometric Catalogue astrometry and extensive follow-up spectroscopy.

KW - Open clusters and associations: individual: η Chamaeleontis

KW - Stars: kinematics and dynamics

KW - Stars: pre-main sequence

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U2 - 10.1111/j.1745-3933.2010.00879.x

DO - 10.1111/j.1745-3933.2010.00879.x

M3 - Letter

SN - 1745-3925

VL - 406

SP - L50-L54

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

First detection of a low-mass stellar halo around the young open cluster η Chamaeleontis

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