EPJ Web Conf.
Volume 152, 2017Wide-Field Variability Surveys: A 21st Century Perspective – 22nd Los Alamos Stellar Pulsation – Conference Series Meeting
|Number of page(s)||2|
|Section||Past and current surveys: What we have learned, where we are standing|
|Published online||08 September 2017|
On the building blocks of the M31 and Milky Way halos
1 Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain
2 Universidad de La Laguna (ULL), Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain
Published online: 8 September 2017
We discuss the formation of the halo of M31 and the Milky Way as traced by the population of RR Lyrae stars, in comparison with the population of such stars preent in satellite dwarf galaxies. We find that both halos and the massive dwarf host a population of high amplitude short period RRab stars, absent in low-mass dwarfs. These stars are explained as the metal-rich tail of the RR Lyrae distribution ([Fe/H] ∼ - 1.5), and thus their existence imply fast chemical enrichment in the host system. Their presence in both halos implies that massive building blocks had an important role in their formation.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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