J/A+A/402/1157 Photometric standards around gravitational lenses (Nakos+ 2003)
A catalog of secondary photometric standard stars around gravitational lenses.
Nakos T., Ofek E.O., Boumis P., Cuypers J., Sinachopoulos D.,
van Dessel E., Gal-Yam A., Papamastorakis J.
<Astron. Astrophys. 402, 1157 (2003)>
=2003A&A...402.1157N 2003A&A...402.1157N
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry, standards ;
Photometry, UBVRI
Keywords: techniques: photometry - gravitational lensing - quasars: general
Abstract:
We present a catalog of secondary photometric standard stars in the
neighborhood of 14 gravitationally lensed quasars. These stars were
verified to be non variable using long-term monitoring.
The instrumental magnitudes of the new standard stars have been
transformed to the Johnson-Cousins BV(RI)c photometric system. For ten
gravitational lenses (GLs) we also provide the BV(RI)c mean magnitudes
of the integrated flux of all the lens components, for the epochs of
the photometric calibration.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 101 14 General information regarding the observations on
which the selection (Wise Observatory) and the
calibration (Skinakas and SAAO Observatories) of
the secondary photometric standard stars was based
table2.dat 106 42 Photometry and astrometry for the new set of
secondary photometric standard stars in the
fields of 14 gravitational lenses
table3.dat 67 10 Photometry for ten gravitational lenses
(integrated flux measured by aperture photometry)
tables.tex 188 181 LaTeX version of the tables
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number of the gravitational lens
4- 17 A14 --- Lens Gravitational lens name
19- 28 A10 "YYYY/MM/DD" StDate Starting date of the observations
at Wise Observatory
30- 39 A10 "YYYY/MM/DD" EnDate Ending date of the observations
at Wise Observatory
41- 43 I3 --- NDet ? Total number of frame used for the
detection of the non-variable stars
45 I1 --- NCal Number of nights at SAAO and Skinakas used
for the calibration to the Johnson-Counsins
photometric system
47- 48 I2 --- o_Bmag ? Total number of exposures in B filter
49 A1 --- --- [/]
50- 51 I2 --- o_Vmag ? Total number of exposures in V filter
52 A1 --- --- [/]
53- 54 I2 --- o_Rcmag ? Total number of exposures in Rc filter
55 A1 --- --- [/]
56- 57 I2 --- o_Icmag ? Total number of exposures in Ic filter
59- 68 A10 "DD/MM/YYYY" Date1 Date in which the photometric calibration
has been carried out (1)
70- 79 A10 "DD/MM/YYYY" Date2 Date in which the photometric calibration
has been carried out (1)
81- 90 A10 "DD/MM/YYYY" Date3 Date in which the photometric calibration
has been carried out (1)
92-101 A10 "DD/MM/YYYY" Date4 Date in which the photometric calibration
has been carried out (1)
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Note (1): For the photometric calibration, systems 7, 8, 13 and 14 were
observed at SAAO, while the other systems were observed at Skinakas.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Lens Field name
17 I1 --- NLens Number of star in the field
19- 20 I2 h RAh Right Ascension J2000 (hours)
22- 23 I2 min RAm Right Ascension J2000 (minutes)
25- 29 F5.2 s RAs Right Ascension J2000 (seconds)
32 A1 --- DE- Declination J2000 (sign)
33- 34 I2 deg DEd Declination J2000 (degrees)
36- 37 I2 arcmin DEm Declination J2000 (minutes)
39- 42 F4.1 arcsec DEs Declination J2000 (seconds)
45- 50 F6.3 mag Vmag V magnitude
52- 56 F5.3 mag e_Vmag Mean error on Vmag
58- 63 F6.3 mag B-V ? B-V Johnson-Cousins color index
65- 69 F5.3 mag e_B-V ? Mean error on B-V
71- 76 F6.3 mag V-Rc V-Rc Johnson-Cousins color index
78- 82 F5.3 mag e_V-Rc Mean error on V-Rc
84- 89 F6.3 mag V-Ic V-Ic Johnson-Cousins color index
91- 95 F5.3 mag e_V-Ic Mean error on V-Ic
97-106 A10 --- OName Other name of the gravitational lens
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Lens Gravitational lens name
17- 22 F6.3 mag Vmag V magnitude (1)
24- 28 F5.3 mag e_Vmag rms uncertainty on Vmag (2)
31- 35 F5.3 mag B-V ? B-V colour index (1)
37- 41 F5.3 mag e_B-V ? rms uncertainty on B-V (2)
44- 48 F5.3 mag V-Rc V-Rc colour index (1)
50- 54 F5.3 mag e_V-Rc rms uncertainty on V-Rc (2)
57- 61 F5.3 mag V-Ic V-Ic colour index (1)
63- 67 F5.3 mag e_V-Ic rms uncertainty on V-Ic (2)
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Note (1): The magnitudes presented are the mean values over the epochs
listed in table1.dat.
Note (2): The photometric errors were calculated in the same way as for
the standards in table2.dat.
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History:
From electronic version of the journal
(End) Francois Ochsenbein [CDS] 26-Aug-2003