J/A+A/356/141 BV photometry for components of HIP doubles (Fabricius+ 2000)
Two-colour photometry for 9473 components of close Hipparcos double
and multiple stars
Fabricius C., Makarov V.V.
<Astron. Astrophys. 356, 141 (2000)>
=2000A&A...356..141F 2000A&A...356..141F
ADC_Keywords: Stars, double and multiple ; Photometry, UBV
Keywords: stars: binaries: visual - techniques: photometric
stars: Hertzsprung-Russell (HR) and C-M diagrams -
Abstract:
Using observations obtained with the Tycho instrument of the ESA
Hipparcos satellite, a two-colour photometry is produced for
components of more than 7000 Hipparcos double and multiple stars with
angular separations 0.1 to 2.5 arcsec. We publish 9473 components of
5173 systems with separations above 0.3 arcsec. The majority of them
did not have Tycho photometry in the Hipparcos catalogue. The
magnitudes are derived in the Tycho B_T and V_T passbands, similar to
the Johnson passbands. Photometrically resolved components of the
binaries with statistically significant trigonometric parallaxes can
be put on an HR diagram, the majority of them for the first time.
Description:
The table contains the Hipparcos (Cat. I/239) identification number,
the number of components photometrically resolved for each system,
component identification letter, Hp magnitude as it is given in the
Hipparcos Double and Multiple Systems Annex (DMSA) and its standard
error, observed Tycho BT and VT magnitudes and their formal
standard errors, and observed signal-to-noise ratio for each component
star. The reference component identification, relative separation and
position angle with respect to the reference component are also given
for secondary component stars. A total of 5173 double and multiple
systems with separations above 0.3arcsec are resolved into 9473
components.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 66 9473 *Catalogue of BT, VT magnitudes for
individual components.
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Note on catalog.dat: Only solutions with signal-to-noise ratio greater than 4
are published, and separations greater than 0.3arcsec.
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos (Cat. I/239) identification number
8 I1 --- Nc [1/4] Number of resolved components
10 A1 --- m_HIP Component identification letter
12- 17 F6.3 mag Hp Hipparcos Hp magnitude from DMSA (1)
19- 23 F5.3 mag e_Hp Standard error of Hp from DMSA (1)
25 A1 --- RefC Reference component id letter
27- 32 F6.3 arcsec Sep [0.3/12.5]? Separation from DMSA (1)
34- 38 F5.1 deg PA [0,360[? Position angle from DMSA (1)
40- 44 F5.2 mag BTmag Observed BT magnitude
46- 49 F4.2 mag e_BTmag Standard error of BT magnitude
51- 55 F5.2 mag VTmag Observed VT magnitude
57- 60 F4.2 mag e_VTmag Standard error of VT magnitude
62- 66 F5.1 --- S/N [4/900] Signal-to noise ratio
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Note (1): DMSA = Double and Multiple Systems Annex of the Hipparcos catalog
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Acknowledgements: Valeri Makarov
(End) Patricia Bauer [CDS] 06-Jan-2000