Statistics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..317j&link_type=abstract
NOAO Proposal ID #2008B-0317
Statistics
Scientific paper
Discrepancies with the traditional theory of formation of planetary nebulae (PNe) are mounting. It seems that few, if any, PNe form from single stars (like the Sun); instead, they form via binary-star interactions. Part of the evidence comes from the 4 PNe in Galactic globular clusters (GCs): simple stellar evolution predicts a population of ~ 16 PNe. These 4 PNe have central stars more massive than GC white dwarfs should be, and 3 of the 4 are located in binary- rich GCs. Since the Galaxy has only ~ 150 GCs, the statistics can only be improved by looking in other galaxies. We propose to improve the statistics by a factor of ~ 3 (from 2- 3σ to ~5σ) by surveying the M31 GC system with the Hydra spectrograph on WIYN. By searching for a PN's [O III] (lambda) 5007 emission in > 500 M31 GCs, and correlating the results with properties such as cluster X-ray brightness and turn-off mass, we can directly test several aspects of the binary origin hypothesis. The PN field is focused on this question: a collaboration of 24 astronomers in 12 countries are now studying the problem via a suite of 13 different observational tests and 3 theoretical investigations (see http://www.wiyn.org/planb/.) This experiment is a key part of that effort.
Ciardullo Robin
de Marco Orsola
Feldmeier John . J.
Fullton Laura
Hwang Ho Seong
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