Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach

Details Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach

2007-01-16

arxiv.org/abs/astro-ph/0701449v1

Mon.Not.Roy.Astron.Soc.377:120-132,2007

Astronomy and Astrophysics

Astrophysics

15 pages, 8 figures, 5 tables. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11508.x

A method is developed for fitting theoretically predicted astronomical spectra to an observed spectrum. Using a hierarchical Bayesian principle, the method takes both systematic and statistical measurement errors into account, which has not been done before in the astronomical literature. The goal is to estimate fundamental stellar parameters and their associated uncertainties. The non-availability of a convenient deterministic relation between stellar parameters and the observed spectrum, combined with the computational complexities this entails, necessitate the curtailment of the continuous Bayesian model to a reduced model based on a grid of synthetic spectra. A criterion for model selection based on the so-called predictive squared error loss function is proposed, together with a measure for the goodness-of-fit between observed and synthetic spectra. The proposed method is applied to the infrared 2.38--2.60 \mic ISO-SWS data (Infrared Space Observatory - Short Wavelength Spectrometer) of the star $\alpha$ Bootis, yielding estimates for the stellar parameters: effective temperature \Teff = 4230 $\pm$ 83 K, gravity $\log$ g = 1.50 $\pm$ 0.15 dex, and metallicity [Fe/H] = $-0.30 \pm 0.21$ dex.

Affiliated with

Also associated with

No associations

Rating

Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimating Stellar Parameters from Spectra using a Hierarchical Bayesian Approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-188152