We examined the Wilson-Bappu effect, a relationship between the absolute magnitude of the star, MV, and the logarithm of the Ca {\sc ii} emission width, W0, over the largest MV range to date, +13 to -5, covering M-dwarfs to type Ia supergiants. We used an extensive literature, the latest Hipparcos reduction, data from two globular clusters, and new observations from Apache Point Observatory to compile a sample that allowed us to study the effect of [Fe/H] on the Wilson-Bappu relationship. Our results include reporting the deviations from linearity and demonstrating that the Wilson-Bappu relationship is insensitive to metallicity.
@article{arxiv.1210.6300,
title = {The [Fe/H] Dependence on the Ca {\sc ii}-$M_V$ Relationship},
author = {Thomas Gomez and George Wallerstein and Elena Pancino},
journal= {arXiv preprint arXiv:1210.6300},
year = {2015}
}
Comments
16 pages, 5 figures, accepted for publication in PASP