J/A+AS/124/353 CCD UBV photometry of close visual doubles (Nakos+ 1997)
UBV absolute CCD photometry and differential astrometry of
close visual double stars, with G-type primaries.
Nakos T., Sinachopoulos D., van Dessel E.
<Astron. Astrophys. Suppl. Ser. 124, 353 (1997)>
=1997A&AS..124..353N 1997A&AS..124..353N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Photometry, CCD ; Photometry, UBV
Keywords: binaries: visual - catalog
Abstract:
We present V magnitudes, (B-V) and (U-B) colours of close visual
double star components, and their differences as well as separations
and position angles of 40 visual double stars. The common properties
of the members of this sample are the small angular separation ρ,
which is less than 7", and the common spectral type of the primaries,
which are of G-type. The observations made with the Bessel U, B and V
filters, while the astrometry was performed in the V filter only. For
the observations, the CCD camera attached to the Cassegrain focus of
the 90 cm Dutch telescope, at La Silla, Chile, had been used. From the
analysis of the data we concluded that from the sample of the fourty
double stars observed seven proved to be physical pairs, while the
rest must have common origin components.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 58 39 Astrometric results
table2 45 80 Photometric results
table3 38 40 Photometric differences and angular separation
of the components
tables.tex 78 313 LaTeX version of the tables
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Visual binary number
5- 6 I2 h RAh Right ascension (J2000)
8- 11 F4.1 min RAm Right ascension (J2000)
13 A1 --- DE- Declination sign
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 28 A9 --- DM Durchmusterung designation of the primary
30- 34 F5.3 arcsec rho Angular separation
36- 39 F4.3 arcsec e_rho rms uncertainty on rho (1)
41- 47 F7.3 deg Theta Position angle
49- 51 F3.2 deg e_Theta rms uncertainty on Theta
53- 58 F6.1 yr Obs Epoch of observation
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Note (1): The very small values of e_rho are due to the assumption of
σr(ρ)=0. We took σr(ρ)=0 for the error
of the angular separation rho due to the atmospheric refraction.
Realistic values of e_rho are probably one order of magnitude higher
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 2 I2 --- No Visual binary number
4- 12 A9 --- DM DM number
13 A1 --- m_DM Multiplicity index on DM
15- 20 F6.3 mag Vmag V magnitude
22- 24 F3.2 mag e_Vmag rms uncertainty on Vmag
26- 30 F5.3 mag B-V B-V colour index
32- 34 F3.2 mag e_B-V rms uncertainty on B-V
36- 41 F6.3 mag U-B U-B colour index
43- 45 F3.2 mag e_U-B rms uncertainty on U-B
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 2 I2 --- No Visual binary number
4- 12 A9 --- DM DM or ADS number
14- 18 F5.3 arcsec rho ? Angular separation
20- 24 F5.3 mag DVmag Difference in V magnitude
26- 31 F6.3 mag D(B-V) Difference in B-V colour index
33- 38 F6.3 mag D(U-B) Difference in U-B colour index
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Acknowledgements: Dimitris Sinachopoulos
(End) Patricia Bauer [CDS] 03-Dec-1996