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J/AJ/105/2265    Spectroscopy and photometry of HD 212280          (Fekel+ 1993)
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Chromospherically active stars. X. Spectroscopy and photometry of HD 212280
      Fekel F.C., Browning J.C., Henry G.W., Morton M.D., Hall D.S.
     <Astron. J. 105, 2265 (1993)>
     =1993AJ....105.2265F
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ADC_Keywords: Binaries, spectroscopic; Radial velocities

Description:
    The system HD 212280 is a chromospherically active double lined
    spectroscopic binary with an orbital period of 45.284 days and an
    eccentricity of 0.50. The spectrum is composite with spectral types of
    G8 IV and F5-8 V for the components. An estimated inclination of 78
    deg +/- 8 deg results in masses of 1.7 and 1.4 solar masses for the G
    subgiant and mid-F star, respectively. The distance to the system is
    estimated to be 112 pc. Photometric observations obtained between 1987
    November and 1992 June reveal that HD 212280 is a newly identified
    variable star with a V amplitude of about 0.15 mag and a mean period of
    29.46 days. Radial velocities are given for each component as are residuals
    from the derived orbit. 


File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table1          67         32    Velocity observations of HD 212280
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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- 11  F11.3  d       HJD      Heliocentric Julian Date of mid observation
      12  A1     ---     note     [abc]'a' -- DDO observation
                                       'b' -- Blended velocity, weight = 0.5
                                       'c' -- central wavelength = 6700 A
  15- 19  F5.3   ---     Phase    Phase of the observation with zero phase being
                                   periastron passage
  24- 28  F5.1   km/s    Va       Observed velocity of component A
  33- 37  F5.1   km/s    (O-C)a   Residual to the fit or observed minus
                                   calculated velocity of A
  41- 45  F5.1   km/s    Vb       []? Observed velocity of component B
  51- 54  F4.1   km/s    (O-C)b   []? Residual to the fit or observed minus
                                   calculated velocity of B
  59- 67  A9     ---     Standard Name of the velocity standard star used to
                                   determine the observed velocity of HD 212280.
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Origin: AAS CD-ROM series, Volume 1, 1993
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(End)                                         Patricia Bauer [CDS]   06-Jul-1994