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J/ApJ/660/1398  Spectro. monitoring of HDE 245770 and X Per (Grundstrom+, 2007)
Joint Hα and X-ray observations of massive X-ray binaries.
III. The Be X-ray binaries HDE 245770 = A0535+26 and X Persei.
    Grundstrom E.D., Boyajian T.S., Finch C., Gies D.R., Huang W.,
    McSwain M.V., O'Brien D.P., Riddle R.L., Trippe M.L., Williams S.J.,
    Wingert D.W., Zaballa R.A.
   <Astrophys. J., 660, 1398-1408 (2007)>
   =2007ApJ...660.1398G
ADC_Keywords: Binaries, spectroscopic ; Binaries, X-ray ; Radial velocities ;
              Equivalent widths
Keywords: stars: emission-line, Be -
          stars: individual (A0535+26, HDE 245770, X Persei) -
          stars: neutron - X-rays: binaries

Abstract:
    We present results from an Hα monitoring campaign of the Be X-ray
    binary systems HDE 245770 = A0535+26 and X Per. We use the Hα
    equivalent widths together with adopted values of the Be star
    effective temperature, disk inclination, and disk outer boundary to
    determine the half-maximum emission radius of the disk as a function
    of time.

Description:
    We observed both HDE 245770 and X Per between 1998 August and 2000
    December with the Kitt Peak National Observatory 0.9m coude feed
    telescope.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    05 38 54.6   +26 18 57   HDE 245770 = V* V725 Tau
    03 55 23.1   +31 02 45   X Per = V* X Per
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1a.dat       74       67   HDE 245770 Hα measurements
table1b.dat       74       49   X Per Hα measurements
table3.dat        23       43   X Per IUE radial velocity measurements


See also:
 J/ApJ/656/431 : LS I +65 010 radial velocities & Halpha EW (Grundstrom+, 2007)
 J/ApJ/656/437 : LS I +61 303 radial velocities & Halpha EW (Grundstrom+, 2007)


Byte-by-byte Description of file: table1[ab].dat

   Bytes Format Units  Label   Explanations

   1- 10  A10   ---    Name    Star name (HDE 245770 or X Per)
  12- 22  F11.3 d      HJD     Mid-exposure Heliocentric Julian Date
  24- 28  F5.3  ---    Phase   Orbital phase (1)
  30- 35  F6.2  0.1nm  EW      Hα equivalent width (2)
  37- 41  F5.1  km/s   RV      Radial velocity (3)
  43- 48  F6.1  km/s   RVv     ? Violet component radial velocity (4)
  50- 54  F5.1  km/s   RVr     ? Red component radial velocity (4)
  56- 59  F4.2  ---   EWv/EWr  ? The Violet/Red equivalent width ratio
  61- 64  F4.2  ---    Iv/Ir   ? The Violet/Red intensity ratio
  66- 69  F4.2  0.1nm  FWHMv   ? Violet component Full-Width at Half-Maximum (5)
  71- 74  F4.2  0.1nm  FWHMRr  ? Red component Full-Width at Half-Maximum (5)

Note (1): From the ephemeris of Finger et al. (1994, in The Evolution of
     X-Ray Binaries, ed. S.S. Holt & C.S. Day (New York: AIP), 459) for HDE
     245770 and from Delgado-Marti et al. (2001ApJ...546..455D) for X Per.
Note (2): Determined by a numerical integration of the line flux over the
     range 6536-6590 Angstroms.
Note (3): The radial velocity of the wings based upon a bisector position
     determined using the method of Shafter, Szkody & Thorstensen
     (1986ApJ...308..765S). This method samples the line wings using
     oppositely signed Gaussian functions and determines the mid-point
     position between the wings by cross-correlating these Gaussians with
     the profile. We used Gaussian functions with FWHM=200 (100) km/s at
     sample positions in the wings of ±320 (±190) km/s for HDE 245770
     (X Per) respectively.
Note (4): Fits of double-peaked Hα profiles using Gaussian functions
     to match the violet and red peaks. These double-Gaussian fits were
     restricted to the inner part of the profile (|Δλ|<6Å
     for HDE 245770 and <2-4Å for X Per) since the wings are much more
     extended that those of Gaussian functions.
Note (5): In units of Angstroms. Note that Hα has only one peak in
     the 2008 observations of X Per, so we fit a single Gaussian to the
     profiles of these three spectra.


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 11  F11.3 d       HJD       Heliocentric Julian date
  13- 17  F5.3  ---     Phase     Orbital phase
  19- 23  F5.1  km/s    RV        Radial velocity


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 II   2007ApJ...656..437G, Cat. J/ApJ/656/437
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    08-Mar-2009