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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 66 9473 *Catalogue of BT, VT magnitudes for individual components.
Note on catalog.dat: Only solutions with signal-to-noise ratio greater than 4 are published, and separations greater than 0.3arcsec.
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP Hipparcos (Cat. I/239) identification number 8 I1 --- Ncomp Number of resolved components 10 A1 --- m_HIP Component identification letter 12- 17 F6.3 mag Hp Hipparcos Hp magnitude from DMSA 19- 23 F5.3 mag e_Hp Standard error of Hp from DMSA 25 A1 --- RefComp Reference component id letter 27- 32 F6.3 arcsec Sep ? Separation from DMSA 34- 38 F5.1 deg PA [0,360[? Position angle from DMSA 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 Signal-to noise ratio
Acknowledgements: Valeri Makarov
(End) Patricia Bauer [CDS] 06-Jan-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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