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Kinematics of RR Lyraes in the Inner (Old?) Halo

Published online by Cambridge University Press:  07 August 2017

Andrew C. Layden  and
Robert J. Zinn
Andrew C. Layden
Affiliation:
Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, CHILE
Robert J. Zinn
Affiliation:
Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 USA

Extract

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Zinn & Lee (1994, in prep.) have shown that the halo globular clusters with Rgc < 6 kpc are dominated by clusters with relatively blue horizontal branches for their metal abundance, which they interpret as a sign of their old relative ages. Of these “Old Halo” clusters having −1.7 < [Fe/H] < −0.8 dex, they find a net rotation about the galactic center of Vrot = 59 ± 22 km s−1, and a line-of-sight velocity dispersion of σlos = 62 ± 10 km s−1.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 404
Copyright
Copyright © Kluwer 1995