J/AJ/146/88 UBVRI standard stars around the celestial equator (Clem+, 2013)
Faint UBVRI standard star fields.
Clem J.L., Landolt A.U.
<Astron. J., 146, 88 (2013)>
=2013AJ....146...88C 2013AJ....146...88C
ADC_Keywords: Photometry, UBVRI ; Stars, standard
Keywords: catalogs - standards; stars: fundamental parameters -
techniques: photometric
Abstract:
High-quality CCD-based UBVRI photometry is presented for ∼45000 stars
distributed among 60 different fields centered on the celestial
equator and at δ~-50°. This photometry has been
calibrated to the standard Johnson UBV and Kron-Cousins RI systems via
observations of the UBVRI standard stars presented in the works of
Landolt. The majority of the stars in our photometric catalog fall in
the magnitude range 12≲V≲22 and in the color range -0.3≲(B-V)≲1.8.
Each star averages 67 measures in each UBVRI filter from data taken on
250 different photometric nights over a period of ∼6.5yr from two
different telescopes. Our final photometric database effectively
extends the UBVRI standard star network defined by Landolt to much
fainter magnitudes and increases the number density of stars within
pre-existing standard fields. Hence, these new, fainter standards
serve as suitable calibrators for investigators who employ either
small or large-aperture telescopes for their observational projects.
Description:
All of the data presented herein were obtained from two telescopes
during the time period between early 2006 and mid-2012. Starting in
2006 February, we began taking data on the 1.0m telescope (f/10) at
the Cerro Tololo Inter-American Observatory (CTIO) using the so-called
"Y4KCam" CCD. We began supplementing these data in 2009 February with
observations conducted on the 2.1m telescope with its "T2KB" detector
at the Kitt Peak National Observatory (KPNO). The photometry has been
calibrated to the standard Johnson UBV and Kron-Cousins RI systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 203 43587 UBVRI photometry and astrometry for stars
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See also:
II/183 : UBVRI Photometric Standards (Landolt 1992)
J/AJ/137/4186 : UBVRI standards around celestial equator (Landolt, 2009)
J/AJ/133/768 : KPNO's UBVRI filter transmission characteristics
(Landolt+, 2007)
J/AJ/133/2502 : UBVRI Standard Stars (Landolt, 2007)
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Field Field identifier
16- 19 I4 --- Star [1/6724] Sequential star number in Field
21- 22 I2 h RAh Hour of Right Ascension (J2000)
24- 25 I2 min RAm Minute of Right Ascension (J2000)
27- 31 F5.2 s RAs Second of Right Ascension (J2000)
33 A1 --- DE- Sign of the Declination (J2000)
34- 35 I2 deg DEd Degree of Declination (J2000)
37- 38 I2 arcmin DEm Arcminute of Declination (J2000)
40- 43 F4.1 arcsec DEs Arcsecond of Declination (J2000)
45- 50 F6.3 mag Umag [9.637/24.114] The Johnson U band magnitude
52- 57 F6.4 mag e_Umag Uncertainty in Umag
59- 61 I3 --- o_Umag Number of measurements of Umag
63- 68 F6.3 mag Bmag [8.606/23.533] The Johnson B band magnitude
70- 75 F6.4 mag e_Bmag Uncertainty in Bmag
77- 79 I3 --- o_Bmag Number of measurements of Bmag
81- 86 F6.3 mag Vmag [7.509/22.509] The Johnson V band magnitude
88- 93 F6.4 mag e_Vmag Uncertainty in Vmag
95- 97 I3 --- o_Vmag Number of measurements of Vmag
99-104 F6.3 mag Rmag [6.911/22.039] The Kron-Cousins R band magnitude
106-111 F6.4 mag e_Rmag Uncertainty in Rmag
113-115 I3 --- o_Rmag Number of measurements of Rmag
117-122 F6.3 mag Imag [6.374/21.851] The Kron-Cousins I band magnitude
124-129 F6.4 mag e_Imag Uncertainty in Imag
131-133 I3 --- o_Imag Number of measurements of Imag
135-140 F6.3 mag U-B The Johnson (U-B) color index
142-147 F6.4 mag e_U-B Uncertainty in U-B (1)
149-154 F6.3 mag B-V The Johnson (B-V) color index
156-161 F6.4 mag e_B-V Uncertainty in B-V (1)
163-168 F6.3 mag V-R The Cousins (V-R) color index
170-175 F6.4 mag e_V-R Uncertainty in V-R (1)
177-182 F6.3 mag R-I The Cousins (R-I) color index
184-189 F6.4 mag e_R-I Uncertainty in R-I (1)
191-196 F6.3 mag V-I The Cousins (V-I) color index
198-203 F6.4 mag e_V-I Uncertainty in V-I (1)
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Note (1): Where the (X-Y) color uncertainty is (σX2+σY2)^0.5
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 15-Jul-2014