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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660828.0, MPI für Astronomie / Publikationen_mpia
Generalized Stellar Parametrizer with Gaia photometry data
Authors:Liu, C.; Bailer-Jones, C. A. L.; Eyer, L.; O'Mullane, W.; De Ridder, J.
Place of Publication:New York
Publisher:Springer Science+Business Media
Date of Publication (YYYY-MM-DD):2012
Title of Book:Astrostatistics and Data Mining
Start Page:155
End Page:162
Full Name of Book-Editor(s):Sarro, Luis Manuel; Eyer, Laurent; O'Mullane, William; De Ridder, Joris
Title of Series:Springer Series in Astrostatistics
Audience:Not Specified
Abstract / Description:GSP-Phot (Generalized Stellar Parametrizer—Photometry) is a software package in the Gaia Astrophysical parameters processing chain (Apsis) which estimates the astrophysical parameters of all stars in the Gaia catalogue. The inputs of GSP-Phot are the low-resolution spectra from the Gaia photometers as well as parallaxes, while the outputs consist of effective temperatures (T eff), extinction parameters (A 0), metallicities ([Fe/H] and surface gravities (logg). Three algorithms are developed in GSP-Phot: (a) support vector machine regression (SVR), a pattern recognition method; (b) ILIUM, a forward model based on discrete synthetic parameter grid; and (c) q-method, a Bayesian method which combines a forward model with parallaxes and the Hertzsprung-Russell diagram (HRD) as a prior. The performance of the three algorithms is investigated for a range of spectral types with arbitrary apparent magnitudes.
Free Keywords:Physics
External Publication Status:published
Document Type:InBook
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISBN:978-1-4614-3322-4
URL:http://cdsads.u-strasbg.fr/abs/2012adm..book..155L
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