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J/other/CoSka/38.538   Radial velocities of TX UMa           (Komzik+, 2008)
Asynchronous rotation of the mass gaining component in the Algol-type binary
TX UMa.
    Komzik R., Chochol D., Grygar J.
   <Contr. Astron. Obs. Skalnate Pleso, 38, 538-544 (2008)>
   =2008CoSka..38..538K
ADC_Keywords: Binaries, eclipsing

Keywords: stars: close binaries - rotational effect - asynchronous rotation -
          TX UMa

Abstract:
    High-dispersion spectrograms of the interacting close binary TX UMa
    taken in 1969-73 around the primary minima were used to display the
    rotational effect of the mass gaining component. The resulting
    rotational velocity of the gainer is 70.8±2.9km/s. The magnitude of
    the effect points to considerable over-synchronous rotation of the
    gainer due to direct impact of the gas flow from the loser component
    onto the surface of the gainer. Some aspects of the secular decrease
    of the orbital period of the system relevant to this finding are
    discussed, too.

Description:
    Our spectroscopy of TXUMa consist of:
  * 96 spectra taken by JG with the Cassegrain spectrograph of the 1.8m
    telescope at the DAO Observatory in the period December 1969 - July 1970.
  * 52 spectra taken by JG in 1972-80 and 7 spectra taken by RK in
    1992-93 with the coude spectrograph of the 2.0m telescope at the
    Ondrejov Observatory.
Objects:
    ----------------------------------------------
       RA   (2000)   DE        Designation(s)
    ----------------------------------------------
    10 45 20.50  +45 33 58.8   TX UMa = HIP 52599
    ----------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        78       42   A list of spectrograms taken during the primary
                           eclipse of TX UMa, their radial velocities, excesses
                           of radial velocities and computed rotational factors


See also:
     J/MNRAS/415/2238 : Abundances of TX UMa (Glazunova+, 2011)


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

   Bytes Format Units      Label     Explanations

   1-  8  A8    ---        Plate     Plate designation (1)
       9  A1    ---        n_Plate   [*] * for not used
  11- 20  A10 "YYYY/MM/DD" Obs.date  UT observation date
  22- 26  A5    "h:m"      Obs.time  UT observation date
  28- 39  F12.4 d          HJD       Heliocentric Julian date
  41- 46  F6.4  ---        Phase     Phase
  48- 50  I3    min        Exp       Exposure time
  52- 53  I2    ---        o_RV      Number of spectral lines used to determine
                                      the radial velocity
  55- 59  F5.1  km/s       RV        Radial velocity
  61- 63  F3.1  km/s       e_RV      rms uncertainty on RV
  65- 69  F5.1  km/s       RV'       Radial velocity excess due to the
                                      rotational effect
  71- 78  F8.5  ---        F         Computed rotational factor

Note (1): Plate origin:
           DAO = Dominion Astrophysical Observatory
           OND = Ondrejov
      LWR, LWP = IUE satellite, low dispersion


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    16-Mar-2012