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From: Bill P. <pa...@ki...> - 2008-05-04 14:39:33
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Hi Falk (and Didier), > On May 4, 2008, at 7:19 AM, Falk Herwig wrote: >> Bill, I am forwarding your request to Didier Saumon at Los Alamos. Thanks Falk -- that's an excellent idea! Didier, as you may recall, the mesa/eos is a blended combination of Frank Timmes' HELM for high T with OPAL and SCVH for lower T. The missing piece is the region that is below OPAL in temperature and below SCVH in density. I'm running models out to the photosphere (gray atmosphere, optical depth of 2/3), and with extremely low masses (0.02Msun in the example in my original email), and the surface of the model is extending into the missing region. Ideally we'd have a continuation of SCVH to much lower densities and/or a continuation of OPAL to much lower temperatures. I think the main deviation from ideal gas that comes into play is the H to H2 transition. I'm sure there are lots of other difficult things to deal with in a full solution, but neutral gas of atoms with H and H2 in transition would be a wonderful first step. Cheers, Bill |