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Impact of Distance Determinations on Galactic Structure. II. Old Tracers |
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| Authors: | Andrea Kunder Elena Valenti Massimo Dall’Ora Pawel Pietrukowicz Chris Sneden Giuseppe Bono Vittorio F Braga Ivan Ferraro Giuliana Fiorentino Giacinto Iannicola Marcella Marconi Clara E Martínez-Vázquez Matteo Monelli Ilaria Musella Vincenzo Ripepi Maurizio Salaris Peter B Stetson |
| Institution: | 1.Saint Martin’s University,Lacey,USA;2.European Southern Observatory,Garching bei Munich,Germany;3.INAF,Osservatorio Astronomico di Capodimonte,Napoli,Italy;4.Warsaw University Observatory,Warszawa,Poland;5.Department of Astronomy,University of Texas,Austin,USA;6.Universita’ di Roma Tor Vergata,Rome,Italy;7.INAF—Osservatorio Astronomico di Roma,Monte Porzio Catone,Italy;8.Instituto Milenio de Astrofisica,Santiago,Chile;9.Departamento de Fisica, Facultad de Ciencias Exactas,Universidad Andres Bello,Las Condes,Chile;10.IINAF—OAS Osservatorio di Astrofisica e Scienza dello Spazio di Bologna,Bologna,Italy;11.Cerro Tololo Inter-American Observatory,National Optical Astronomy Observatory,La Serena,Chile;12.IAC—Instituto de Astrofísica de Canarias,La Laguna,Spain;13.Instituto de Astrofisica de Canarias,La Laguna,Spain;14.Astrophysics Research Institute,John Moores University,Liverpool,UK;15.DAO/HIA,NRC,Victoria,Canada |
| Abstract: | Here we review the efforts of a number of recent results that use old tracers to understand the build up of the Galaxy. Details that lead directly to using these old tracers to measure distances are discussed. We concentrate on the following: (1) the structure and evolution of the Galactic bulge and inner Galaxy constrained from the dynamics of individual stars residing therein; (2) the spatial structure of the old Galactic bulge through photometric observations of RR Lyrae-type stars; (3) the three-dimensional structure, stellar density, mass, chemical composition, and age of the Milky Way bulge as traced by its old stellar populations; (4) an overview of RR Lyrae stars known in the ultra-faint dwarfs and their relation to the Galactic halo; and (5) different approaches for estimating absolute and relative cluster ages. |
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