NDLI: The Gaia astrophysical parameters inference system (Apsis)

Content Provider	EDP Sciences
Author	C. A. L. Bailer-Jones R. Andrae B. Arcay T. Astraatmadja I. Bellas-Velidis A. Berihuete A. Bijaoui C. Carrión C. Dafonte Y. Damerdji A. Dapergolas P. de Laverny L. Delchambre P. Drazinos R. Drimmel Y. Frémat D. Fustes M. García-Torres C. Guédé U. Heiter A.-M. Janotto A. Karampelas D.-W. Kim J. Knude I. Kolka E. Kontizas M. Kontizas A. J. Korn A. C. Lanzafame Y. Lebreton H. Lindstrøm C. Liu E. Livanou A. Lobel M. Manteiga C. Martayan Ch. Ordenovic B. Pichon A. Recio-Blanco B. Rocca-Volmerange L. M. Sarro K. Smith R. Sordo C. Soubiran J. Surdej F. Thévenin P. Tsalmantza A. Vallenari J. Zorec
Abstract	The Gaia satellite will survey the entire celestial sphere down to 20th magnitude, obtaining astrometry, photometry, and low resolution spectrophotometry on one billion astronomical sources, plus radial velocities for over one hundred million stars. Itsmain objective is to take a census of the stellar content of our Galaxy, with the goal of revealing its formation and evolution. Gaia’s unique feature is the measurement of parallaxes and proper motions with hitherto unparalleled accuracy for many objects. As a survey, the physical properties of most of these objects are unknown. Here we describe the data analysis system put together by the Gaia consortium to classify these objects and to infer their astrophysical properties using the satellite’s data. This system covers single stars, (unresolved) binary stars, quasars, and galaxies, all covering a wide parameter space. Multiple methods are used for many types of stars, producing multiple results for the end user according to different models and assumptions. Prior to its application to real Gaia data the accuracy of these methods cannot be assessed definitively. But as an example of the current performance, we can attain internal accuracies (rms residuals) on F, G, K, M dwarfs and giants at G = 15 (V = 15–17) for a wide range of metallicites and interstellar extinctions of around 100 K in effective temperature (T_{eff_{), 0.1 mag in extinction (A_{0_{), 0.2 dex in metallicity ([Fe/H]), and 0.25 dex in surface gravity (log g). The accuracy is a strong function of the parameters themselves, varying by a factor of more than two up or down over this parameter range. After its launch in December 2013, Gaia will nominally observe for five years, during which the system we describe will continue to evolve in light of experience with the real data.}}}}
Page Count	20
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2013/11/aa22344-13/aa22344-13.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	559
DOI	10.1051/0004-6361/201322344
Language	English
Publisher	EDP Sciences
Publisher Date	2013-11-01
Access Restriction	Open
Rights Holder	© ESO, 2013
Subject Keyword	galaxies: fundamental parameters methods: data analysis methods: statistical stars: fundamental parameters surveys galaxies: fundamental parameters / methods: data analysis / methods: statistical / stars: fundamental parameters / surveys
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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