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J/ApJ/656/437   LS I +61 303 radial velocities and Halpha EW (Grundstrom+, 2007)
Joint Hα and X-ray observations of massive X-ray binaries.
II. The Be X-ray binary and microquasar LS I +61 303.
    Grundstrom E.D., Caballero-Nieves S.M., Gies D.R., Huang W., McSwain M.V.,
    Rafter S.E., Riddle R.L., Williams S.J., Wingert D.W.
   <Astrophys. J., 656, 437-443 (2007)>
   =2007ApJ...656..437G
ADC_Keywords: Binaries, spectroscopic ; Binaries, X-ray ; Radial velocities ;
              Equivalent widths
Keywords: binaries: spectroscopic - stars: early-type -
          stars: emission-line, Be - stars: individual (LS I +61 303) -
          stars: neutron - stars: winds, outflows

Abstract:
    We present the results of an Halpha monitoring campaign on the BeXRB and
    microquasar system LS I +61 303. We use radial velocity measurements
    of HeI lines in our spectra to reevaluate the orbital elements and to
    better establish the time of periastron. We list equivalent widths and
    other parameters for the Halpha emission line and discuss the orbital
    phase related variations observed.
Objects:
    -----------------------------------------------------
       RA   (2000)   DE      Designation(s)
    -----------------------------------------------------
    02 40 31.7   +61 13 46   LS I +61 303 = V* V615 Cas
    -----------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        83      100   Radial Velocity and Hα Measurements


See also:
 J/ApJ/656/431 : LS I +65 10 radial velocities and Halpha EW (Grundstrom+, 2007)


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

   Bytes Format Units   Label    Explanations

   1- 11  F11.3 d       HJD      Mid-exposure Heliocentric Julian Date
  13- 17  F5.3  ---     Phase    Orbital phase (Taylor & Gregory,
                                  1982ApJ...255..210T)
  19- 23  F5.1  km/s    RV       Radial velocity
      25  A1    ---     f_RV     [a] Flag on RVel (1)
  27- 31  F5.1  km/s    (O-C)    Observed minus calculated residual from the fit
  33- 37  F5.1  km/s    VISM     Interstellar line offset
  39- 44  F6.2  0.1nm   EWHa     Hα equivalent width in Angstroms (2)
  46- 50  F5.1  km/s    RV(W)    Radial velocity from cross-correlating
                                  Gaussians with Hα profile wings
  52- 57  F6.1  km/s    RV(V)    Radial velocity of violet Hα peak
  59- 63  F5.1  km/s    RV(R)    Radial velocity of red Hα peak
  65- 68  F4.2  ---     Ratio    Ratio of violet to red equivalent widths
  70- 73  F4.2  ---     V/R      The peak violet to red peak intensity ratio
  75- 78  F4.2  0.1nm   FWHM(V)  Full-Width at Half-Maximum of violet Hα
                                  peak
  80- 83  F4.2  0.1nm   FWHM(R)  Full-Width at Half-Maximum of red Hα peak

Note (1): a = Assigned zero weight.

Note (2): Includes the full extent of the line wings.



History:
    From electronic version of the journal

References:
   Grundstrom et al.,  Paper I     2007ApJ...656..431G, Cat. J/ApJ/656/431
   Grundstrom et al.,  Paper III   2007ApJ...660.1398G, Cat. J/ApJ/660/1398
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    10-Dec-2008