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argiopetech / base

Bayesian Analysis for Stellar Evolution
http://webfac.db.erau.edu/~vonhippt/base9/
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[Fe/H] extrapolation #21

Closed tedvh closed 5 years ago

tedvh commented 11 years ago

The code is allowing [Fe/H] extrapolation somewhere. This may be a bug or it may be a feature. The most metal-rich of our models has an upper [Fe/H] limit of +0.5, but every now and then there are excursions to +4 or more.

At present, this is very low priority because a) it happens rarely, and b) it may only be happening when running single WDs, the parameters of which are very insensitive to [Fe/H].

argiopetech commented 11 years ago

And this is why we need test cases. We may want to consider putting a dampening factor or even a hard limit on the extrapolation code (with appropriate warnings) if extrapolations well outside the bounds of the models are plausible but not desired.

Elliot Robinson Email: elliot.robinson@argiopetech.com Phone: (321) 252-9660

On Tue, Jun 25, 2013 at 10:23 AM, tedvh notifications@github.com wrote:

The code is allowing [Fe/H] extrapolation somewhere. This may be a bug or it may be a feature. The most metal-rich of our models has an upper [Fe/H] limit of +0.5, but every now and then there are excursions to +4 or more.

At present, this is very low priority because a) it happens rarely, and b) it may only be happening when running single WDs, the parameters of which are very insensitive to [Fe/H].

— Reply to this email directly or view it on GitHubhttps://github.com/argiopetech/base/issues/21 .

tedvh commented 11 years ago

Two good points. We'd have to ask the Bayesians about this, but my guess is that we'll want hard limits.

On 6/25/13 11:30 AM, Elliot Robinson wrote:

And this is why we need test cases. We may want to consider putting a dampening factor or even a hard limit on the extrapolation code (with appropriate warnings) if extrapolations well outside the bounds of the models are plausible but not desired.

Elliot Robinson Email: elliot.robinson@argiopetech.com Phone: (321) 252-9660

On Tue, Jun 25, 2013 at 10:23 AM, tedvh notifications@github.com wrote:

The code is allowing [Fe/H] extrapolation somewhere. This may be a bug or it may be a feature. The most metal-rich of our models has an upper [Fe/H] limit of +0.5, but every now and then there are excursions to +4 or more.

At present, this is very low priority because a) it happens rarely, and b) it may only be happening when running single WDs, the parameters of which are very insensitive to [Fe/H].

— Reply to this email directly or view it on GitHubhttps://github.com/argiopetech/base/issues/21 .

— Reply to this email directly or view it on GitHub https://github.com/argiopetech/base/issues/21#issuecomment-19984619.

Ted von Hippel

Department of Physical Sciences Embry-Riddle Aeronautical University 600 S. Clyde Morris Boulevard Daytona Beach, FL 32114-3900 386-226-7751