Skip navigation
Skip navigation

Reconciling the galactic bulge turnoff age discrepancy with enhanced helium enrichment

Nataf, David; Gould, A

Description

We show that the factor 2 discrepancy between spectroscopic and photometric age determinations of the Galactic bulge main-sequence turnoff can be naturally explained by positing an elevated helium enrichment for the bulge relative to that assumed by standard isochrones. Helium enhancement relative to standard isochrones is confirmed at the 2.3σ level. We obtain an upper bound on the helium enrichment for the metal-rich ([Fe/H] +0.30) stars of ΔY +0.11 relative to canonical expectations, given...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
URI: http://hdl.handle.net/1885/66510
Source: Astrophysical Journal Letters
DOI: 10.1088/2041-8205/751/2/L39

Download

File Description SizeFormat Image
01_Nataf_Reconciling_the_galactic_bulge_2012.pdf598.7 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  20 July 2017/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator