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J/A+A/469/285       Differential Stroemgren photometry of U Oph    (Vaz+, 2007)
Absolute dimensions of eclipsing binaries.
XXV. U Ophiuchi and the evolution and composition of 5 M☉ stars.
     Vaz L.P.R., Andersen J., Claret A.
    <Astron. Astrophys. 469, 285 (2007)>
    =2007A&A...469..285V
ADC_Keywords: Binaries, eclipsing ; Photometry, uvby

Keywords: stars: binaries: eclipsing - stars: fundamental parameters -
          stars: evolution - Galaxy: evolution

Abstract:
    We aim to determine absolute dimensions for the mid B-type
    eclipsing binary U Ophiuchi and compare the inferred ages and
    chemical compositions to those of other binary stars with masses 
    near 5M☉.

    We determine masses, radii, logg, logTeff, and luminosities for 
    the stars in U Oph from new radial velocities and uvby light curves.
    By improving the Wilson-Devinney code, we also derive precise
    apsidal-motion and light-time orbits of this triple system, using 353
    times of minimum over 120 years. Finally, we compare the data for
    U Oph and similar systems with the predictions of stellar models.

Description:
    Table 5 presents 645 uvby magnitude differences U Oph - HR 6367 in
    the instrumental system of the 0.5m Stroemgren Automatic Telescope
    (SAT) at ESO, La Silla, Chile, obtained from 1992 to 1994.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    17 16 31.7   +01 12 38   U Oph = HD 156247
    17 08 13.7   -01 04 46   HR 6367 = HD 154895
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table5.dat        62      645   645 magnitude differences U Oph - HR 6367
                             obtained from 1992 to 1994 (instrumental system)


See also:
  J/A+A/461/1077 : Radial velocities of DW Car (Southworth+, 2007)
  J/A+A/487/1095 : Radial velocities of QD Boo, VZ Hya, WZ Oph (Clausen+, 2008)


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1- 13  F13.5 d       JD        Julian date
  15- 20  F6.3  mag     ymag      Stroemgren y magnitude
  22- 27  F6.3  mag     b-y       Stroemgren b-y colour index
  29- 34  F6.3  mag     m1        Stroemgren m1 colour index
  36- 41  F6.3  mag     c1        Stroemgren c1 colour index
  43- 48  F6.3  mag     bmag      Stroemgren b magnitude
  50- 55  F6.3  mag     vmag      Stroemgren v magnitude
  57- 62  F6.3  mag     umag      Stroemgren u magnitude


Acknowledgements:
    Luiz Paulo Ribeiro Vaz, lpv(at)fisica.ufmg.br

References:
   Andersen et al.,      Paper I      1983A&A...121..271A
   Andersen et al.,      Paper II     1983A&A...128...17A
   Andersen & Vaz,       Paper III    1984A&A...130..102A
   Vaz & Andersen,       Paper IV     1984A&A...132..219V
   Andersen et al.,      Paper V      1984A&A...134..147A
   Andersen et al.,      Paper VI     1984A&A...137..281A
   Andersen & Gimenez,   Paper VII    1985A&A...145..206A
   Andersen et al.,      Paper VIII   1985A&A...151..329A
   Popper et al.,        Paper IX     1985AJ.....90.1324P
   Andersen et al.,      Paper X      1987A&A...174..107A
   Clausen et al.,       Paper XI     1986A&A...167..287C
   Andersen et al.,      Paper XII    1987A&A...175...60A
   Andersen et al.,      Paper XIII   1988A&A...196..128A
   Andersen et al.,      Paper XIV    1989A&A...211..346A
   Andersen & Clausen,   Paper XV     1989A&A...213..183A
   Andersen et al.,      Paper XVI    1990A&A...228..365A
   Andersen et al.,      Paper XVII   1991A&A...246...99A
   Clausen & Gimenez,    Paper XVIII  1991A&A...241...98C
   Clausen,              Paper XIX    1991A&A...246..397C
   Andersen et al.,      Paper XX     1993A&A...277..439A
   Alencar et al.,       Paper XXI    1997A&A...326..709A
   Torres et al.,        Paper XXII   1997AJ....114.2764T
   Torres et al.,        Paper XXIII  2000AJ....119.1942T
   Southworth & Clausen, Paper XXIV   2007A&A...461.1077S, Cat. J/A+A/461/1077
   Clausen et al.,       Paper XXVI  2008A&A...487.1095C, Cat. J/A+A/487/1095
(End) Luiz Paulo Ribeiro Vaz [DF-ICEx-UFMG], Patricia Vannier [CDS]  23-Apr-2007