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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731627.0, MPI für Astronomie / Publikationen_mpia
The Panchromatic Hubble Andromeda Treasury. XV. The BEAST: Bayesian extinction and stellar tool
Authors:Gordon, K. D.; Fouesneau, M.; Arab, H.; Tchernyshyov, K.; Weisz, D. R.; Dalcanton, J. J.; Williams, B. F.; Bell, E. F.; Bianchi, L.; Boyer, M.; Choi, Y.; Dolphin, A.; Girardi, L.; Hogg, D. W.; Kalirai, J. S.; Kapala, M.; Lewis, A. R.; Rix, H.-W.; Sandstrom, K.; Skillman, E. D.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 104 (20 pp)
Audience:Not Specified
Abstract / Description:We present the Bayesian Extinction And Stellar Tool (BEAST), a probabilistic approach to modeling the dust extinguished photometric spectral energy distribution of an individual star while accounting for observational uncertainties common to large resolved star surveys. Given a set of photometric measurements and an observational uncertainty model, the BEAST infers the physical properties of the stellar source using stellar evolution and atmosphere models and constrains the line of sight extinction using a newly developed mixture model that encompasses the full range of dust extinction curves seen in the Local Group. The BEAST is specifically formulated for use with large multi-band surveys of resolved stellar populations. Our approach accounts for measurement uncertainties and any covariance between them due to stellar crowding (both systematic biases and uncertainties in the bias) and absolute flux calibration, thereby incorporating the full information content of the measurement. We illustrate the accuracy and precision possible with the BEAST using data from the Panchromatic Hubble Andromeda Treasury. While the BEAST has been developed for this survey, it can be easily applied to similar existing and planned resolved star surveys. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
Free Keywords:dust; extinction; galaxies: individual: M31; methods: data analysis; methods: statistical; stars: fundamental parameters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/0004-637X/826/2/104
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