Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.2612f&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #26.12; Bulletin of the American Astronomical Society, Vol. 29, p.811
Astronomy and Astrophysics
Astronomy
Scientific paper
Low-mass stars leaving the asymptotic giant branch (AGB) and passing through spectral types F and A should make excellent Population II standard candles. Theoretically, they should have a very narrow luminosity function: the upper limit is set by the much shorter lifetimes of the more luminous post-AGB (PAGB) stars, and the lower limit corresponds to the turnoff mass of the oldest progenitors. Moreover, PAGB A-F stars are readily recognized because of their enormous Balmer jumps. They should be found in the halos of spiral galaxies where internal absorption is minimized and also in elliptical galaxies. As part of an ongoing project to calibrate PAGB stars as standard candles, we are searching for them in old populations of Local Group galaxies. We employ a hybrid CCD photometric system that combines the Gunn u filter with Johnson-Kron-Cousins BVI. We have used Kurucz/Hubeny model atmospheres and stellar emergent spectra along with filter transmission functions and instrument sensitivity curves to generate synthetic photometric indices that can be parameterized in terms of stellar log {g} and T_eff. Calibration results from Local Group galaxies observed to dat will be presented. Supported by NASA Grant NAGW-4361.
Bond Howard E.
Fullton Laura Kellar
Saffer Rex A.
Saha Avishek
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