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A VLT/FORS2 spectroscopic survey of individual stars in a transforming dwarf galaxy

Published online by Cambridge University Press:  21 March 2017

G. Battaglia ,
N. Kacharov  and
M. Rejkuba
G. Battaglia
Affiliation:
Instituto de Astrofísica de Canarias, calle Vía Láctea s/n, E38205 - La Laguna (Tenerife), Spain Universidad de la Laguna, Dpto. Astrofisica, 38206 La Laguna, Tenerife, Spain email: [email protected]
N. Kacharov
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
M. Rejkuba
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
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Abstract

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Understanding the properties of dwarf galaxies is important not only to put them in their proper cosmological context, but also to understand the formation and evolution of the most common type of galaxies. Dwarf galaxies are divided into two main classes, dwarf irregulars (dIrrs) and dwarf spheroidals (dSphs), which differ from each other mainly because the former are gas-rich objects currently forming stars, while the latter are gas-deficient with no on-going star formation. Transition types (dT) are thought to represent dIs in the process of losing their gas, and can therefore shed light into the possible process of dwarf irregulars (dIrrs) becoming gas-deficient, passively evolving galaxies. Here we present preliminary results from our wide-area VLT/FORS2 MXU spectroscopic survey of the Phoenix dT, from which we obtained line-of-sight velocities and metallicities from the nIR Ca II triplet lines for a large sample of individual Red Giant Branch stars.

Keywords

techniques: spectroscopicstars: abundancesgalaxies: dwarfgalaxies: evolutionLocal Group
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 28 - 30
Copyright
Copyright © International Astronomical Union 2017 

References

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