Spectroscopic signatures of youth in low-mass kinematic candidates of young moving groups
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2014Metadata
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Gálvez Ortiz, M. C.
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Spectroscopic signatures of youth in low-mass kinematic candidates of young moving groups
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Abstract
We present a study of age-related spectral signatures observed in 25 young low-mass objects
that we have previously determined as possible kinematic members of five young moving
groups: the Local Association (Pleiades moving group, age = 20.150 Myr), the Ursa Major
group (Sirius supercluster, age = 300 Myr), the Hyades supercluster (age = 600 Myr), IC
2391 supercluster (age = 35.55 Myr) and the Castor moving group (age = 200 Myr). In this
paper we characterize the spectral properties of observed high- or low-resolution spectra of our
kinematic members by fitting theoretical spectral distributions. We study signatures of youth,
such as lithium I 6708A, H[alfa] emission and other age-sensitive spectroscopic signatures in order
to confirm the kinematic memberships through age constraints. We find that 21 (84 per cent)
targets show spectroscopic signatures of youth in agreement with the age ranges of the moving
group to which membership is implied. For two further objects, age-related constraints remain
difficult to determine from our analysis. In addition, we confirm two moving group kinematic
candidates as brown dwarfs.
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MCGO acknowledges financial support by the Spanish MICINN
under the Consolider-Ingenio 2010 Program grant CSD2006-
00070: First Science with the GTC (http://www.iac.es/consolideringenio-
gtc). She also acknowledges the support of a JAE-Doc CSIC
fellowship co-funded with the European Social Fund under the program
‘Junta para la Ampliaci´on de Estudios’. The work of MKK
and YaVP was supported by EU PF7 Marie Curie Initial Training
Networks (ITN) ROPACS project (GA N 213646). Financial
support was also provided by the Spanish Ministerio de Ciencia e
Innovaci´on and Ministerio de Econom´ıa y Competitividad under
AyA2011- 30147-C03-03 grant. SLF acknowledges funding support
from the ESO-Government of Chile Mixed Committee 2009,
and from the GEMINI–CONICYT grant 32090014/2009. JSJ acknowledges
funding by Fondecyt through grant 3110004 and partial
support from CATA (PB06, Conicyt), the GEMINI-CONICYT
FUND and from the Comit´e Mixto ESO-GOBIERNO DE CHILE.
Financial support was also provided by theMexican research council
(CONACYT) grant.
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MNRAS 439, 3890–3907 (2014)
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