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Session 14 - Milky Way Galaxy.
Display session, Monday, January 15
North Banquet Hall, Convention Center
Presented is a scheme using broad band filters for determining the relative metal abundances of M stars. The "Lindblad depression" makes a filter centered at 425nm dimmer for metal poor stars than for normal stars. A temperature dependent color is made from filters centered at 535nm and 900nm. This is plotted against 425nm-535nm to determine metallicity. Typical metal poor stars separate from disk stars by a about tenth of a magnitude in 425nm-535nm, and the extreme subdwarf LHS453 separates from disk stars by .8mag. This is useful in surveys, where one wants to find a lot of metal poor stars quickly.
