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The Nature of the Triangulum-Andromeda Stellar Structures

Published online by Cambridge University Press:  30 October 2019

J. V. Sales Silva ,
H. Perottoni ,
K. Cunha ,
H. J. Rocha-Pinto ,
D. Souto  and
F. Almeida-Fernandes
J. V. Sales Silva
Affiliation:
Observatório Nacional/MCTIC Rua Gen. José Cristino, 77, 20921-400, Rio de Janeiro, Brazil emails: [email protected]; [email protected]; [email protected]
H. Perottoni
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antônio 43, 20080-090, Rio de Janeiro, Brazil, email: [email protected]
K. Cunha
Affiliation:
Observatório Nacional/MCTIC Rua Gen. José Cristino, 77, 20921-400, Rio de Janeiro, Brazil emails: [email protected]; [email protected]; [email protected] University of Arizona, Tucson, AZ 85719, USA
H. J. Rocha-Pinto
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antônio 43, 20080-090, Rio de Janeiro, Brazil, email: [email protected]
D. Souto
Affiliation:
Observatório Nacional/MCTIC Rua Gen. José Cristino, 77, 20921-400, Rio de Janeiro, Brazil emails: [email protected]; [email protected]; [email protected]
F. Almeida-Fernandes
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antônio 43, 20080-090, Rio de Janeiro, Brazil, email: [email protected]
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Abstract

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The outer stellar halo is home to a number of substructures that are remnants of former interactions of the Galaxy with its dwarf satellites. Triangulum-Andromeda (TriAnd) is one of these halo substructures, found as a debris cloud by Rocha-Pinto et al., (2004) using 2MASS M giants. Would be these structures related to dwarf galaxies or to the galactic disk? To uncover the nature of these stars we performed a high-resolution spectroscopic study (R = 40,000) along with a kinematic analysis using Gaia data. We determined the atmospheric parameters and chemical abundances of Ca and Mg for the 13 TriAnd candidate stars along with their respective orbits. Our results indicate that the TriAnd stars analyzed have a galactic nature but that these stars are not from the local thin disk.

Keywords

Galaxy: structureGalaxy: outer diskstars: chemical abundancesstars: kinematic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 122 - 124
Copyright
© International Astronomical Union 2019 

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