J/A+A/422/1023 Nearby visual double stars UBVRI photometry (Strigachev+, 2004)
Multicolour CCD measurements of nearby visual double stars. II.
Strigachev A., Lampens P.
<Astron. Astrophys. 422, 1023 (2004)>
=2004A&A...422.1023S 2004A&A...422.1023S
ADC_Keywords: Stars, double and multiple ; Stars, nearby ; Photometry, CCD ;
Photometry, UBVRI
Keywords: stars: binaries: visual - techniques: photometric -
stars: fundamental parameters
Abstract:
We present accurate CCD astrometric and photometric data for 31 nearby
visual double stars in the standard filters BVRI. The observations
were collected with a 1.3-m telescope in 2001-2002. The results
consist of relative astrometric positions (epoch, angular separation
and position angle) and differential BVRI photometry of the
components. Mean errors are: 0.01" for the separation; 0.06° for the
position angle; and 0.015mag for the photometric data. Comparing the
relative positions at different epochs, we evaluate the physical
association of the systems. We additionally derive fractional masses
and true separations for the most probable binary systems and,
whenever orbits are available, also total and component masses.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 106 31 Astrometric results and comparison of the
relative positions with the Hipparcos data
table5.dat 62 28 Differential photometry
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP (I/239) number
7 A1 --- --- [/]
8- 9 I2 --- n_HIP ? Last two digit of the second HIP number
when double
11- 19 F9.4 yr Epoch Epoch in Bessel year
21- 26 F6.3 arcsec rho Angular separation
28- 32 F5.3 arcsec e_rho rms uncertainty on rho
34- 39 F6.2 deg theta Position angle (measured from North to East)
41- 44 F4.2 deg e_theta rms uncertainty on theta
46- 51 F6.3 arcsec Drho Angular separation difference (our - HIP)
53 A1 --- n_Drho [1] Note on Drho (1)
56- 61 F6.2 deg Dtheta Position angle difference (our - HIP)
63 A1 --- n_Dtheta [1] Note on Dtheta (1)
66- 71 F6.3 arcsec Dpos Position difference (our - HIP)
73 A1 --- n_Dpos [1] Note on Dpos (1)
76-106 A31 --- Rem Remarks
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Note (1): 1: Comparison of the position with respect to the position at
epoch 2002.318 by Mason et al., 2004, Cat. J/AJ/127/539
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP (I/239) number
7 A1 --- --- [/]
8- 9 I2 --- n_HIP ? Last two digit of the second HIP number
when double
13- 17 F5.3 mag DVmag Magnitude difference of the components in V
19- 23 F5.3 mag e_DVmag rms uncertainty on e_DVmag
25- 30 F6.3 mag D(B-V) ? B-V colour index difference of the components
32- 36 F5.3 mag e_D(B-V) ? rms uncertainty on D(B-V)
38- 43 F6.3 mag D(V-R) ? V-R colour index difference of the components
45- 49 F5.3 mag e_D(V-R) ? rms uncertainty on D(V-R)
51- 56 F6.3 mag D(V-I) ? V-I colour index difference of the components
58- 62 F5.3 mag e_D(V-I) ? rms uncertainty on D(V-I)
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Table5b: Differential R photometry
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HIP DRmag e_DRmag D(R-I) e_D(R-I)
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79492 0.041 0.004 -- --
97292 0.954 0.004 0.246 0.006
106694 1.742 0.017 0.478 0.002
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Acknowledgements:
Anton Strigachev ,
Patricia Lampens ,
References:
Lampens & Strigachev, Paper I 2001A&A...368..572L 2001A&A...368..572L
(End) Patricia Vannier [CDS] 29-Apr-2004