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- W81321237 abstract "Cepheids are a type of variable star that play a key role in establishing the astronomical distance scale. These objects undergo regular pulsations, shrinking and expanding as their luminosities and colors vary in synchronism. It has long been known that the period of the pulsation is related to the luminosity of the star (the Period-Luminosity relationship), and therefore these objects become ”standard candles” that allow us to estimate the distances of objects once we measure their periods and the flux from the stars received on Earth. Calibrating the zero-point of the Period-Luminosity relationship therefore becomes a critical measurement that has repercussions throughout astronomy. These stars are very luminous, and therefore can be seen to rather large distances, which makes them very valuable as standard candles; however, most of them are out of reach of the most direct distance measurements, and even the nearest can only be measured with rather large errors. We have been investigating another approach to determining the distance to these objects that depends upon a detailed study of both photometry and radial velocity information. Analysis of such data has up until now been rather ad hoc; we have been exploring Bayesian methods in order to systematize the technique. Among the features with which a fully Bayesian analysis of these data must contend are: Model selection (the light curves and velocity profiles need to be modeled accurately yet parsimoniously), and errors-in-variables. We will describe several approaches, one due to Gull, and another using the program BUGS by Spiegelhalter et. al. We are particularly interested in learning ideas that may assist us in carrying out our program." @default.
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- W81321237 date "1998-01-01" @default.
- W81321237 modified "2023-09-27" @default.
- W81321237 title "Bayesian Analysis of Cepheid Variable Data" @default.
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