Aug 5th, 2007| 01:25 am | Posted by hlee
From arxiv/astro-ph:0707.1891v1
The Geneva-Copenhagen Survey of the Solar neighborhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metalicity diagram, and heating mechanisms of the disk by Holmberg, Nordstrom, and Andersen
Researchers, including scientists from CHASC, working on color magnitude diagrams to infer ages, metalicities, temperatures, and other physical quantities of stars and stellar clusters may find this paper useful.
Continue reading ‘[ArXiv] Geneva-Copenhagen Survey, July 13, 2007’ »
Tags:
age,
calibration,
CMD,
distance,
metalicity,
reddening,
relations,
star formation,
survey,
Uncertainty Category:
arXiv,
CHASC,
Fitting,
Spectral |
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Jul 16th, 2007| 03:31 pm | Posted by hlee
From arxiv/astro-ph:0707.2064v1
Star Formation via the Little Guy: A Bayesian Study of Ultracool Dwarf Imaging Surveys for Companions by P. R. Allen.
I rather skip all technical details on ultracool dwarfs and binary stars, reviews on star formation studies, like initial mass function (IMF), astronomical survey studies, which Allen gave a fair explanation in arxiv/astro-ph:0707.2064v1 but want to emphasize that based on simple Bayes’ rule and careful set-ups for likelihoods and priors according to data (ultracool dwarfs), quite informative conclusions were drawn:
Continue reading ‘[ArXiv] Bayesian Star Formation Study, July 13, 2007’ »
Tags:
Bayesian,
binary,
dwarfs,
IMF,
likelihood,
prior,
star formation,
survey,
upper limit Category:
arXiv,
Bayesian,
Objects |
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