团块红巨星作为距离指标的理论期望

Highlights of Astronomy Pub Date : 2000-10-10 DOI:10.1017/S1539299600014684

L. Girardi

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引用次数: 1

摘要

红团巨星的I波段绝对星等随恒星年龄和金属丰度的变化预计为~ 0.4等。不考虑某些潜在的理论不确定性，情况就是如此。星系间星团的平均年龄和金属丰度的巨大差异导致它们的星团质量有系统的变化(最高可达~ 0.4等)。这些数字还表明，到LMC的距离不一定“短”。

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Theoretical expectations for clump red giants as distance indicators

Variations of ~ 0.4 mag are expected in the I -band absolute magnitude of red clump giants, , as a function of both stellar age and metallicity. This is the case regardless of some potential theoretical uncertainties. The quite large differences in mean ages and metallicities of clump stars among galaxies result in systematic changes (of up to ~ 0.4 mag) in their . These numbers also indicate a distance to the LMC that is not necessarily “short”.

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Highlights of Astronomy

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