J/MNRAS/501/2848 Spectrophotometric standard cand. photometry (Altavilla+, 2021)
The Gaia spectrophotometric standard stars survey.
IV. Results of the absolute photometry campaign.
Altavilla G., Marinoni S., Pancino E., Galleti S., Bellazzini M., Sanna N.,
Rainer M., Tessicini G., Carrasco J.M., Bragaglia A., Schuster W.J.,
Cocozza G., Gebran M., Voss H., Federici L., Masana E., Jordi C.,
Monguio M., Castro A., Pena-Guerrero M.A., Perez-Villegas A.
<Mon. Not. R. Astron. Soc. 501, 2848 (2021)>
=2021MNRAS.501.2848A 2021MNRAS.501.2848A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, standard ; Photometry, UBVRI ; Photometry, CCD
Keywords: techniques: photometric - catalogues - surveys - stars: general
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 ∼1 per cent or better, depending on
the photometric band. Extensive comparisons with various literature
sources show an overall ∼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.
Description:
Johnson-Kron-Cousins BVR(I when available) magnitudes of 198 out of 228
candidate spectrophotometric standard stars (SPSS) for the external
(absolute) flux calibration of Gaia data. The missing 30 stars were
rejected (data available in Table 5 in the paper).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 159 198 BVRI program stars magnitudes
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See also:
J/MNRAS/426/1767 : Gaia spectrophotometric standard stars I. (Pancino+, 2012)
J/MNRAS/462/3616 : Gaia SPSS variability monitoring (Marinoni+, 2016)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SPSSID [1/355] SPSS internal ID
6- 27 A22 --- Name SPSS name
30- 31 I2 h RAh Right ascension (J2000)
33- 34 I2 min RAm Right ascension (J2000)
36- 40 F5.2 s RAs Right ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd Declination (J2000)
47- 48 I2 arcmin DEm Declination (J2000)
50- 53 F4.1 arcsec DEs Declination (J2000)
56- 61 F6.3 mag Bmag Johnson B magnitude
64- 69 F6.3 mag Vmag Johnson V magnitude
72- 77 F6.3 mag Rmag Cousins R magnitude
80- 85 F6.3 mag Imag ?=99.999 Cousins I magnitude
88- 92 F5.3 mag e_Bmag Bmag uncertainty
95- 99 F5.3 mag e_Vmag Vmag uncertainty
102-106 F5.3 mag e_Rmag Rmag uncertainty
109-114 F6.3 mag e_Imag ?=99.999 Imag uncertainty
117 I1 --- NB Number of nights for B
120 I1 --- NV Number of nights for V
123 I1 --- NR Number of nights for R
126 I1 --- NI Number of nights for I
129-130 I2 --- o_Bmag Number of measurements for B
133-134 I2 --- o_Vmag Number of measurements for V
137-138 I2 --- o_Rmag Number of measurements for R
141 I1 --- o_Imag Number of measurements for I
144 I1 --- f_Bmag [0/1] 1 if no fully photometric nights
147 I1 --- f_Vmag [0/1] 1 if no fully photometric nights
150 I1 --- f_Rmag [0/1] 1 if no fully photometric nights
154-155 I2 --- f_Imag ?=99 [0,1] 1 if no fully photometric nights
158-159 I2 --- Note [1/36]? Individual notes, see (1)
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Note (1): Individual notes as follows::
1 = Literature data available in: Landolt A.U. & Uomoto A.K.,
2007AJ....133..768L 2007AJ....133..768L, CALSPEC g191b2bmod011
2 = Literature data available in: Landolt A.U. 2009AJ....137.4186L 2009AJ....137.4186L,
Clem J.L. & Landolt A.U. 2013AJ....146...88C 2013AJ....146...88C, CALSPEC gd71mod011
3 = Literature data available in:
Bohlin R.C. Landolt A.U. 2015AJ....149..122B 2015AJ....149..122B, CALSPEC gd153mod011
4 = Literature data available in: Landolt A.U. 1992AJ....104..372L 1992AJ....104..372L
5 = Literature data available in: Landolt A.U. 2009AJ....137.4186L 2009AJ....137.4186L,
CALSPEC gd50_004
6 = Literature data available in:
Landolt A.U. & Uomoto A.K. 2007AJ....133..768L 2007AJ....133..768L, CALSPEC hz2_005
7 = Literature data available in: Landolt A.U. 2009AJ....137.4186L 2009AJ....137.4186L,
Clem J.L. & Landolt A.U. 2013AJ....146...88C 2013AJ....146...88C, CALSPEC gd108_005
8 = Literature data available in:
Landolt A.U. & Uomoto A.K. 2007AJ....133..768L 2007AJ....133..768L, CALSPEC feige34stis006
9 = Literature data available in:
Landolt A.U. & Uomoto A.K. 2007AJ....133..768L 2007AJ....133..768L, CALSPEC feige66_002
10 = Literature data available in:
Landolt A.U. & Uomoto A.K. 2007AJ....133..768L 2007AJ....133..768L, CALSPEC hz44stis006
11 = Literature data available in: Landolt A.U. & Uomoto A.K.
2007AJ....133..768L 2007AJ....133..768L, CALSPEC grw70d5824mod_001
12 = Literature data available in: Landolt A.U. 2009AJ....137.4186L 2009AJ....137.4186L,
Clem J.L. & Landolt A.U. 2013AJ....146...88C 2013AJ....146...88C, CALSPEC g9348004
13 = Literature data available in: Landolt A.U. & Uomoto A.K.
2007AJ....133..768L 2007AJ....133..768L, CALSPEC ltt9491_002
14 = Literature data available in: Landolt A.U. & Uomoto A.K.
2007AJ....133..768L 2007AJ....133..768L, CALSPEC feige110stisnic008
15 = Literature data available in: Landolt A.U. & Uomoto A.K.
2007AJ....133..768L 2007AJ....133..768L, CALSPEC agk81d266stisnic_007
16 = Literature data available in: Landolt A.U. & Uomoto A.K.
2007AJ....133..768L 2007AJ....133..768L, CALSPEC feige67_002
17 = Literature data available in: Landolt A.U. 1983AJ.....88..439L 1983AJ.....88..439L
18 = Literature data available in: Landolt A.U. 2009AJ....137.4186L 2009AJ....137.4186L
19 = Literature data available in: CALSPEC 1743045mod003
20 = Literature data available in: CALSPEC 1805292mod003
21 = Literature data available in: CALSPEC 1812095mod003
22 = Literature data available in: CALSPEC p041cmod003
23 = Literature data available in: Bohlin R.C. Landolt A.U.
2015AJ....149..122B 2015AJ....149..122B, CALSPEC p177dmod003
24 = Literature data available in: Bohlin R.C. Landolt A.U.
2015AJ....149..122B 2015AJ....149..122B, CALSPEC p330emod004
25 = Literature data available in: CALSPEC kf08t3 mod 002.fits
26 = Literature data available in: CALSPEC kf06t2mod004
27 = Literature data available in: CALSPEC gj7541amod001
28 = Literature data available in: Landolt A.U. 2013AJ....146..131L 2013AJ....146..131L,
Clem J.L. & Landolt A.U. 2016AJ....152...91C 2016AJ....152...91C
29 = Literature data available in: Landolt A.U. 2009AJ....137.4186L 2009AJ....137.4186L,
Clem J.L. & Landolt A.U. 2013AJ....146...88C 2013AJ....146...88C
30 = Literature data available in: Landolt A.U. & Uomoto A.K.
2007AJ....133..768L 2007AJ....133..768L
31 = Literature data available in: Landolt A.U. 2007AJ....133.2502L 2007AJ....133.2502L,
Clem J.L. & Landolt A.U. 2013AJ....146...88C 2013AJ....146...88C
32 = Misidentified with WD 1211-169 in literature and
in Pancino et al. 2012MNRAS.426.1767P 2012MNRAS.426.1767P
33 = Candidate binary star (Hoard et al. 2007AJ....134...26H 2007AJ....134...26H)
34 = Literature data available in: Landolt A.U. 2013AJ....146..131L 2013AJ....146..131L
35 = Coordinates from The USNO-B1.0 Catalog (Monet et al. 2003AJ....125..984M 2003AJ....125..984M,
Cat. I/284), included after Pancino et al. 2012MNRAS.426.1767P 2012MNRAS.426.1767P
publication
36 = Coordinates from SDSS DR7 (Abazajian K.N et al. 2009ApJS..182..543A 2009ApJS..182..543A),
included after Pancino et al. 2012MNRAS.426.1767P 2012MNRAS.426.1767P publication
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Acknowledgements:
Giuseppe Altavilla, giuseppe.altavilla(at)inaf.it
References:
Pancino et al., Paper I 2012MNRAS.426.1767P 2012MNRAS.426.1767P, Cat. J/MNRAS/426/1767
Altavilla et al., Paper II 2015AN....336..515A 2015AN....336..515A
Marinoni et al., Paper III 2016MNRAS.462.3616M 2016MNRAS.462.3616M, Cat. J/MNRAS/462/3616
(End) G. Altavilla [INAF-OAR, SSDC-ASI, Italy], P. Vannier [CDS] 18-Jan-2021