The [Fe/H] Dependence on the Ca<scp>ii</scp>-<i>M</i><sub><i>V</i></sub>Relationship
The [Fe/H] Dependence on the Ca<scp>ii</scp>-<i>M</i><sub><i>V</i></sub>Relationship
We examined the Wilson-Bappu effect, a relationship between the absolute magnitude of the star, $M_V$, and the logarithm of the Ca {\sc ii} emission width, $W_0$, over the largest $M_V$ range to date, +13 to -5, covering M-dwarfs to type Ia supergiants. We used an extensive literature, the latest Hipparcos …