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  4. The Pristine survey IX. CFHT ESPaDOnS spectroscopic analysis of 115 bright metal-poor candidate stars
 
research article

The Pristine survey IX. CFHT ESPaDOnS spectroscopic analysis of 115 bright metal-poor candidate stars

Venn, Kim A.
•
Kielty, Collin L.
•
Sestito, Federico
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March 1, 2020
Monthly Notices Of The Royal Astronomical Society

A chemo-dynamical analysis of 115 metal-poor candidate stars selected from the narrow band Pristine photometric survey is presented based on CFHT high-resolution ESPaDOnS spectroscopy, We have discovered 28 new bright (V < 15) stars with I Fe/H] <-2,5 and 5 with 1Fe/11-11 <-3.0 for success rates of 40 (28/70) and 19 per cent (5/27), respectively. A detailed model atmosphere analysis is carried out for the 28 new metal-poor stars. Stellar parameters were determined from SDSS photometric colours, Gala DR2 parallaxes, MESA/MIST stellar isochrones, and the initial Pristine survey metallicities, following a Bayesian inference method, Chemical abundances are determined for 10 elements (Na, Mg, Ca, Sc, Ti, Cr, Fe, Ni, Y, and Ba), Most stars show chemical abundance patterns that are similar to the normal metal-poor stars in the Galactic halo; however, we also report the discoveries of a new r-process-rich star, a new CF.MP-s candidate with I Y/Ba 0, and a metal-poor star with very low I Mg/Fe I, The kinematics and orbits for all of the highly probable metal-poor candidates are determined by combining our precision radial velocities with Gaia DR2 proper motions. Some stars show unusual kinematics for their chemistries, including planar orbits, unbound orbits, and highly elliptical orbits that plunge deeply into the Galactic bulge (Rperi < 0.5 kpc); also, eight stars have orbital energies and actions consistent with the Gaia-Enceladus accretion event. This paper contributes to our understanding of the complex chemo-dynamics of the metal-poor Galaxy, and increases the number of known bright metal-poor stars available for detailed nucleosynthetic studies.

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Type
research article
DOI
10.1093/mnras/stz3546
Web of Science ID

WOS:000518143200014

Author(s)
Venn, Kim A.
Kielty, Collin L.
Sestito, Federico
Starkenburg, Else
Martin, Nicolas
Aguado, David S.
Arentsen, Anke
Bonifacio, Piercarlo
Caffau, Elisabetta
Hill, Vanessa
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Date Issued

2020-03-01

Publisher

OXFORD UNIV PRESS

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

492

Issue

3

Start page

3241

End page

3262

Subjects

Astronomy & Astrophysics

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Astronomy & Astrophysics

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galaxy: stellar content

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galaxy: kinematics and dynamics

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galaxy: abundances

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stars: population ii

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stars: abundances

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stars: kinematics and dynamics

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lte line formation

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milky-way

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chemical-composition

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hamburg/eso survey

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model atmospheres

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stellar halo

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galactic bar

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1st stars

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galaxy

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fe

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
March 21, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/167505
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