J/A+A/543/A106 UBVRI photometry in NGC6791 (Brogaard+, 2012)
Age and helium content of the open cluster NGC6791 from multiple eclipsing
binary members.
II. Age dependencies and new insights.
Brogaard K., VandenBerg D.A., Bruntt H., Grundahl F., Frandsen S.,
Bedin L.R., Milone A.P., Dotter A., Feiden G.A., Stetson P.B., Sandquist E.,
Miglio A., Stello D., Jessen-Hansen J.
<Astron. Astrophys. 543, A106 (2012)>
=2012A&A...543A.106B 2012A&A...543A.106B
ADC_Keywords: Clusters, open ; Photometry, UBVRI
Keywords: open clusters and association: individual NGC 6791 -
stars: evolution - binaries: eclipsing - stars: abundances -
techniques: photometric - techniques: spectroscopic
Abstract:
We present a new reduction of optical photometry for the open cluster
NGC6791.
Description:
New reduction of photometric B, V, I observations from Stetson et al.
(2003, Cat. J/PASP/115/413) with updated photometry zero-points
according to Stetson et al. (2005PASP..117..563S 2005PASP..117..563S), and the same
photometry, but empirically corrected for differential reddening using
the procedure described in Milone et al. (2012A&A...540A..16M 2012A&A...540A..16M).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photom.dat 200 15395 BVI photometry and photometry corrected empirically
for differential reddening
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See also:
J/PASP/115/413 : BVI photometry in the open cluster NGC 6791 (Stetson+, 2003)
J/A+A/525/A2 : Eclipsing binaries in NGC6791 (Brogaard+, 2011)
Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID ID number
7- 14 F8.3 --- Xpos X-position in reference image
16- 23 F8.3 --- Ypos Y-position in reference image
25- 30 F6.3 mag Vmag V-magnitude
32- 37 F6.4 mag e_Vmag 1-σ uncertainty on V-magnitude
39- 44 F6.3 mag Bmag ?=99.999 B-magnitude
46- 51 F6.4 mag e_Bmag ?=9.9999 1-σ uncertainty on B-magnitude
53- 58 F6.3 mag Imag ?=99.999 I-magnitude
60- 65 F6.4 mag e_Imag ?=9.9999 1-σ uncertainty on I-magnitude
67- 72 F6.3 mag --- ?=99.999 R-magnitude (not measured)
74- 79 F6.4 mag --- ?=9.9999 1-σ uncertainty on R-magnitude
81- 86 F6.3 mag --- ?=99.999 U-magnitude (not measured)
88- 93 F6.4 mag --- ?=9.9999 1-σ uncertainty on U-magnitude
95- 97 I3 --- o_Vmag Number of individual V-measurements
99-100 I2 --- o_Bmag Number of individual B-measurements
102-104 I3 --- o_Imag Number of individual I-measurements
106 I1 --- --- [0] Number of individual R-measurements
108 I1 --- --- [0] Number of individual U-measurements
110-115 F6.3 --- chi χ quality measure (1)
117-122 F6.3 --- sharp sharp quality measure (1)
124-129 F6.3 --- W/S Welch-Stetson (1993AJ....105.1813W 1993AJ....105.1813W)
variabillity index
131-135 F5.1 --- w_W/S Weight of W/S variabillity index
137-143 F7.4 --- W/Se ?=-9.9999 Evidence for variabillity index
log(index*wt)
145-146 I2 h RAh Right ascension (J2000.0)
148-149 I2 min RAm Right ascension (J2000.0)
151-155 F5.2 s RAs Right ascension (J2000.0)
157 A1 --- DE- Declination sign (J2000.0)
158-159 I2 deg DEd Declination (J2000.0)
161-162 I2 arcmin DEm Declination (J2000.0)
164-167 F4.1 arcsec DEs Declination (J2000.0)
169-176 F8.4 mag Bmagc ?=-9.9999 Corrected B-magnitude
178-184 F7.4 mag Vmagc ?=-9.9999 Corrected V-magnitude
186-192 F7.4 mag Imagc ?=-9.9999 Corrected I-magnitude
194-200 F7.4 mag difred [-0.03/0.041]?=-9.9999 Relative reddening
correction ΔE(B-V)
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Note (1): measures of the quality of the PSF match:
* χ: large values should be disregarded
* sharp is close to zero for isolated stars, significantly negative
for bad pixels and cosmic rays; significantly positive for blended
or non-stellar objects.
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Acknowledgements:
Karsten Brogaard, kfb(at)phys.au.dk
References:
Brogaard et al., Paper I 2011A&A...525A...2B 2011A&A...525A...2B, Cat. J/A+A/525/A2
(End) Karsten Brogaard [UVic, Canada], Patricia Vannier [CDS] 22-Jun-2012