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J/other/AstBu/62.339  Speckle interferometry of nearby multiples (Balega+, 2007)
Speckle interferometry of nearby multiple stars.
IV. Measurements in 2004 and new orbits.
    Balega I.I., Balega Yu.Yu., Maksimov A.F., Malogolovets E.V.,
    Rastegaev D.A., Shkhagosheva Z.U., Weigelt G.
   <Astrophys. Bull., 62, 339-351 (2007)>
   =2007AstBu..62..339B
ADC_Keywords: Stars, double and multiple


Abstract:
    The results of speckle interferometric observations of 104 binary and
    6 triple stars performed at the BTA 6m telescope in 2004 October are
    presented. Nearby low-mass stars are mostly observed for the program,
    among which 59 there are new binaries recently discovered by the
    Hipparcos astrometric satellite. Concurrently with the
    diffraction-limited position measurements we obtained 154 brightness
    ratio measurements of binary and multiple star components in different
    bands of the visible spectrum. New, first-resolved binaries are the
    symbiotic star CH Cyg with a weak companion at 0.043" separation and
    the pair of red dwarfs, GJ 913 = HIP 118212. In addition, we derived
    the orbital parameters for two interferometric systems: the CN-giant
    pair HD 210211 = HIP 109281 (P=10.7yr) and the G2V-K2V G2V-K2V binary
    GJ 9830 = HIP 116259 (P=15.7yr).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        93      180   Double star measurements
table2.dat        93       16   Triple star measurements


See also:
         I/239 : Hipparcos and Tycho Catalogues (ESA 1997)
         I/237 : Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
 J/A+A/385/87  : Speckle interferometry of nearby multiple stars (Balega+, 2002)
 J/A+A/422/627 : Nearby multiple stars speckle interferometry (Balega+, 2004)


Byte-by-byte Description of file: table1.dat table2.dat

   Bytes Format Units   Label     Explanations

   1-  6  I6    ---     HIP       ?=-  HIP number
   8- 21  A14   ---     Name      Name
  23- 30  A8    ---     Disc      Discoverer designation
  32- 41  A10   ---     WDS       WDS J2000 designation (HHMMm+DDMM)
  43- 51  F9.4  yr      Epoch     Epoch of observation
  53- 54  A2    ---     Comp      Component (default is VB)
  56- 60  F5.1  deg     theta     Measured position angle
      61  A1    ---     n_theta   [*] * for theta measurements with
                                        the ±180° ambiguity
  62- 65  F4.1  deg     e_theta   rms uncertainty on theta
  68- 72  I5    mas     rho       Measured angular distance
      74  I1    mas     e_rho     ?=- rms uncertainty on rho
  76- 79  F4.2  mag     Dmag      ? Observed magnitude difference between
                                    the components
      80  A1    ---     n_Dmag    [*] * for bad seeing
  82- 85  F4.2  mag     e_Dmag    ? rms uncertainty on Dmag
  87- 89  I3    nm      lambda    Central wavelength of the filter used to make
                                   the observation
      90  A1    ---     ---       [/]
  91- 93  I3    nm      FWHM      FWHM of the filter passband


History:
    From electronic version of the journal

References:
   Balega et al., Paper I     2002A&A...385...87B, Cat. J/A+A/385/87
   Balega et al., Paper II    2004A&A...422..627B, Cat. J/A+A/422/627
   Balega et al., Paper III   2006BSAO...59...20B
(End)                                      Patricia Vannier [CDS]    13-Oct-2008