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J/A+A/429/309       HR 1099 radial velocities                    (Frasca+, 2005)
Orbital period variation in close binaries from radial velocity data and
magnetic activity cycles. II. HR 1099.
    Frasca A., Lanza A.F.
   <Astron. Astrophys. 429, 309 (2005)>
   =2005A&A...429..309F
ADC_Keywords: Stars, variable ; Radial velocities

Keywords: stars: binaries: close - stars: activity -
          stars: binaries spectroscopic - stars: individual: HR 1099

Abstract:
    We studied orbital period changes in the non-eclipsing close binary
    HR 1099, one of the most bright members of the RS CVn class of
    magnetically active binary systems. Intermediate-resolution optical
    spectroscopy and IUE archive spectra were used to build
    radial-velocity curves yielding epochs of superior conjunction with an
    accuracy of 0.01 days. The final database ranged from 1976 to 2002 and
    allowed us a better assessment of the amplitude of the orbital period
    variation and its timescale.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    03 36 47.3   +00 35 16   HR 1099 = HD 22468
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        39      159   Radial velocities from IUE spectra
table2.dat        47      137   Radial velocity of the G5 V and K1 IV components
                             of HR 1099 from Osservatorio Astrofisico di
                             Catania (OAC) optical spectra
tables.tex        92      449   LaTeX version of the tables


See also:
    VI/110 : Final Merged Log of IUE Observations (NASA-ESA, 2000)


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

   Bytes Format Units  Label    Explanations

   1-  8  A8    ---   Spectrum  Spectrum designation in IUE Archive
  11- 23  F13.5 d      HJD      Heliocentric Julian date
  29- 33  F5.1  km/s   RVG5     Radial velocity of the G5 V component of HR 1099
  37- 39  F3.1  km/s   e_RVG5   rms uncertainty on RVG5


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

   Bytes Format Units   Label     Explanations

   1- 13  F13.5 d       HJD       Heliocentric Julian date
  18- 23  F6.2  km/s    RVG5      ? Radial velocity of the G5 V component of HR 1099
  28- 30  F3.1  km/s    e_RVG5    ? rms uncertainty on RVG5
  35- 39  F5.1  km/s    RVK1      ? Radial velocity of the K1 IV component of HR 1099
  44- 46  F3.1  km/s    e_RVK1    ? rms uncertainty on RVK1


Acknowledgements: Antonio Frasca, afr(at)ct.astro.it

(End)                                      Patricia Vannier [CDS]    07-Sep-2004