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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

yyyy The Gaia spectrophotometric standard stars survey - IV. Results of the absolute photometry campaign

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Author(s):
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Altavilla, G. [1, 2] ; Marinoni, S. [1, 2] ; Pancino, E. [1, 3] ; Galleti, S. [4] ; Bellazzini, M. [4] ; Sanna, N. [3] ; Rainer, M. [3] ; Tessicini, G. [4] ; Carrasco, J. M. [5] ; Bragaglia, A. [4] ; Schuster, W. J. [6] ; Cocozza, G. [4] ; Gebran, M. [7] ; Voss, H. [5] ; Federici, L. [4] ; Masana, E. [5] ; Jordi, C. [5] ; Monguio, M. [5] ; Castro, A. [8, 9] ; Pena-Guerrero, M. A. [10] ; Perez-Villegas, A. [6, 11]
Total Authors: 21
Affiliation:
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[1] Space Sci Data Ctr ASI, Via Politecn SNC, I-00133 Rome - Italy
[2] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Roma - Italy
[3] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence - Italy
[4] INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna - Italy
[5] Univ Barcelona IEEC UB, Inst Ciencies Cosmos ICCUB, Dept Fis Quant & Astrofis, Marti & Franques 1, E-08028 Barcelona 1 - Spain
[6] Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 106, Ensenada 22800, Baja California - Mexico
[7] Notre Dame Univ Louaize, Dept Phys & Astron, POB 72, Zouk Mikael - Lebanon
[8] Univ Nacl Autonoma Mexico, Observ Astron Nacl, Apartado Postal 877, Ensenada 22800, Baja California - Mexico
[9] Consorcio Invest Golfo Mexico, CICESE, Carretera Ensenada Tijuana 3918, Ensenada 22860, Baja California - Mexico
[10] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 - USA
[11] Univ Sao Paulo, IAG, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
Total Affiliations: 11
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 501, n. 2, p. 2848-2861, FEB 2021.
Web of Science Citations: 0
Abstract

We present Johnson-Kron-Cousins BVRI photometry of 228 candidate spectrophotometric standard stars for the external (absolute) flux calibration of Gaia data. The data were gathered as part of a 10-yr observing campaign with the goal of building the external grid of flux standards for Gaia and we obtained absolute photometry, relative photometry for constancy monitoring, and spectrophotometry. Preliminary releases of the flux tables were used to calibrate the first two Gaia releases. This paper focuses on the imaging frames observed in good sky conditions (about 9100). The photometry will be used to validate the ground-based flux tables of the Gaia spectrophotometric standard stars and to correct the spectra obtained in non-perfectly photometric observing conditions for small zero-point variations. The absolute photometry presented here is tied to the Landolt standard stars system to similar or equal to 1 per cent or better, depending on the photometric band. Extensive comparisons with various literature sources show an overall similar or equal to 1 per cent agreement, which appears to be the current limit in the accuracy of flux calibrations across various samples and techniques in the literature. The Gaia photometric precision is presently of the order of 0.1 per cent or better, thus various ideas for the improvement of photometric calibration accuracy are discussed. (AU)

FAPESP's process: 17/15893-1 - Globular cluster orbits of bulge: the formation and evolution of the Milky Way
Grantee:Maria de Los Angeles Perez Villegas
Support type: Scholarships in Brazil - Post-Doctorate