Book chapter
The Age and Helium Abundance of the Galactic Bulge
Fifty years of wide field studies in the Southern Hemisphere : resolved stellar populations of the galactic bulge and Magellanic Clouds : proceedings of a conference celebrating CTIO's 50th anniversary held at La Serena, Chile, 06-09 May 2013, pp.173-181
Astronomical Society of the Pacific Conference Series, v. 491, Astronomical Society of the Pacific
2015
Abstract
I discuss the age and helium abundance of the Galactic bulge stellar population. I present examples as to how age and helium abundance can be degenerate observationally, and thus, how unstated assumptions of the helium-metallicity relation can result in biased age-metallicity determinations. I summarize efforts to tackle this degeneracy using the red giant branch bump, forward modeling of microlensing selection effects, and direct mass and metallicity measurements of stars along the red giant branch. I make the case that the degeneracy between these two parameters can be resolved in the near future.
Details
- Title: Subtitle
- The Age and Helium Abundance of the Galactic Bulge
- Creators
- D. M. Nataf - ACT
- Contributors
- S Points (Editor)A Kunder (Editor)
- Resource Type
- Book chapter
- Publication Details
- Fifty years of wide field studies in the Southern Hemisphere : resolved stellar populations of the galactic bulge and Magellanic Clouds : proceedings of a conference celebrating CTIO's 50th anniversary held at La Serena, Chile, 06-09 May 2013, pp.173-181
- Publisher
- Astronomical Society of the Pacific; San Francisco
- Series
- Astronomical Society of the Pacific Conference Series; v. 491
- ISSN
- 1050-3390
- Number of pages
- 8
- Language
- English
- Date published
- 2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701817802771
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