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J/A+A/309/521       55 UMa spectroscopic orbit (Horn+, 1996)
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Spectroscopic orbit of the triple star 55 Ursae Majoris.
     Horn J., Kubat J., Harmanec P., Koubsky P., Hadrava P., Simon V.,
     Stefl S., Skoda P.
    <Astron. Astrophys. 309, 521 (1996)>
    =1996A&A...309..521H      (SIMBAD/NED BibCode)
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ADC_Keywords: Binaries, spectroscopic ; Binaries, orbits ; Radial velocities
Keywords: stars: binaries: spectroscopic - stars: individual: 55 UMa -
          stars: fundamental parameters

Description:
    The first investigation of the known triple system 55 UMa (2.55d
    binary in a ~1870-d orbit with the third star) based on electronic
    spectra led to several new findings about the system: (1) Discovery of
    spectral lines of the tertiary and an unambiguous detection of the
    lines of the secondary. Spectra of both primary and tertiary are of
    the same strength and correspond to spectral class A0V. The secondary
    spectrum is about twice fainter in the visual region and belongs
    probably also to spectral class A. (2) First self-consistent orbital
    solution describing close and wide orbit and the detection of apsidal
    motion for the close pair. The orbital period of the close pair was
    improved to (2.5538380+/-0.0000046d) and basic physical elements for
    all three stars and the system were estimated. The orbital solution
    also gives the period of apsidal motion of the close pair of
    (450+/-60)yr and leads to a good agreement with the published
    speckle-interferometric orbit for the distant companion if the
    longitude of periastron passage is increased by 180deg.

Objects:
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          RA  (2000)  DE      Designation(s)
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       11 19 08    +38 11 11  55 UMa = HD 98353 = HR 4380 = BD +38 2225
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File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             72       45   Radial velocities of 55 UMa
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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-  8  A8    ---     Inst    Instrument (1)
   9- 21  F13.4 d       HJD     Heliocentric Julian date
  23- 27  F5.1  km/s    RV1a    Primary radial velocity from all lines
  30- 34  F5.3  ---     w1a     Weight of the particular radial velocity RV1a
  36- 40  F5.1  km/s    RV1     []? Primary radial velocity from CaI line
  43- 47  F5.3  ---     w1      []? Weight of the particular radial velocity RV1
  50- 54  F5.1  km/s    RV2     []? Secondary radial velocity from CaI line
  57- 61  F5.3  ---     w2      []? Weight of the particular radial velocity RV2
  64- 72  A9    A       W       Wavelength range
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Note (1): AUR: Aurelier spectrograph
          RET: Reticon in Coude spectrograph
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(End)                                          Patricia Bauer [CDS]  08-Feb-1996