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J/A+A/608/L8        Calibration of G passband for Gaia DR1 (Maiz Apellaniz 2017)

Calibration of the photometric G passband for Gaia Data Release 1. Maiz Apellaniz J. <Astron. Astrophys. 608, L8 (2017)> =2017A&A...608L...8M (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Photometry, G band Keywords: surveys - methods: data analysis - techniques: photometric Abstract: On September 2016 the first data from Gaia were released (DR1). The first release included photometry for over 109 sources in the very broad G system. To test the correspondence between G magnitudes in DR1 and the synthetic equivalents derived using spectral energy distributions from observed and model spectrophotometry. To correct the G passband curve and to measure the zero point in the Vega system. Methods. I have computed the synthetic G and Tycho-2 BTVT photometry for a sample of stars using the Next Generation Spectral Library (NGSL) and the Hubble Space Telescope (HST) CALSPEC spectroscopic standards. I have found that the nominal G passband curve is too blue for the DR1 photometry, as shown by the presence of a color with an exponent of 0.783 eliminates the color term. The corrected passband has a Vega zero point of 0.070±0.004 magnitudes. Description: File table1 contains the nominal and the corrected total-system passbands and file table2 contains the stars used for the calculation of the correction. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 20 362 Nominal and corrected total-system passbands table2.dat 64 84 Stars used for the correction
See also: I/337 : Gaia DR1 (Gaia Collaboration, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 nm lambda Wavelength 6- 12 F7.5 --- Nominal Nominal total-system passband 14- 20 F7.5 --- Corrected Corrected total-system passband
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Star Star name 18- 36 I19 --- ID Gaia DR1 identification (source_id) 38- 39 I2 h RAh Right ascension (J2000) 41- 42 I2 min RAm Right ascension (J2000) 44- 49 F6.3 s RAs Right ascension (J2000) 51 A1 --- DE- Declination sign (J2000) 52- 53 I2 deg DEd Declination (J2000) 55- 56 I2 arcmin DEm Declination (J2000) 58- 62 F5.2 arcsec DEs Declination (J2000) 64 A1 --- Flag [NC] SED source (N: NGSL, C: CALSPEC) (1)
Note (1): SED source as follows: N = NGSL C = CALSPEC
Acknowledgements: Jesus Maiz Apellaniz
(End) Patricia Vannier [CDS] 01-Dec-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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