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J/ApJ/525/420  UV and optical line variations in {epsilon} Persei (Gies+, 1999)
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Ultraviolet and optical line profile variations in the spectrum of
{epsilon} Persei
    Gies D.R., Kambe E., Josephs T.S., Bagnuolo W.G., Choi Y.J., Gudehus D.,
    Guyton K.M., Hartkopf W.I., Hildebrand J.L., Kaye A.B., Mason B.D.,
    Riddle R.L., Sowers J.W., Turner N.H., Wilson J.W., Xiong Y.
   <Astrophys. J. 525, 420 (1999)>
   =1999ApJ...525..420G
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ADC_Keywords: Binaries, spectroscopic ; Spectra, ultraviolet ; Spectroscopy ;
              Stars, early-type ; Stars, variable
Mission_Name: IUE
Keywords: binaries: spectroscopic - stars: early-type - stars: individual
          ({epsilon} Persei) - stars: oscillations - stars: winds,
          outflows - ultraviolet: stars

Abstract:
    The rapid variable star, {epsilon} Per (B0.5 IV-III), displays the
    largest amplitude profile fluctuations known among the growing number
    of massive, spectrum-variable stars. Here we present an analysis of a
    continuous 5 day run of IUE UV spectroscopy, and we show for the first
    time that the systematic, blue-to-red moving patterns observed in
    high-quality optical spectra are also present in the UV photospheric
    lines. We present cross-correlation functions of the individual
    spectra with that of a narrow-lined standard that produce a high
    signal-to-noise ratio representation of the blue-to-red moving bump
    patterns found in individual lines. We then use time series analysis
    methods to determine the periodic components of the profile variations
    (after reregistering the spectra to correct for binary motion). There
    are at least six periods present (ranging from 8.46 to 2.27 hr), and
    most of these signals are also found in optical line variations
    observed in 1986 (although the relative amplitudes have changed
    significantly). Furthermore, analysis of a shorter time series of IUE
    spectra from 1984 shows that similar periods were present then. We
    also present H{alpha} and He I 6678 profiles obtained with the Georgia
    State University Multi-Telescope Telescope, which were made
    simultaneously with IUE, and we show that the profile variations are
    essentially identical in the UV and optical ranges.

Objects:
    ------------------------------------------------------------------
       RA   (2000)   DE    Designation(s)
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    03 57 51.2   +40 00 37 Eps Per = HD 24760 = SAO 56840 = HIP 18532
    ------------------------------------------------------------------

File Summary:
--------------------------------------------------------------------------------
 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table1.dat        24      181   International Ultraviolet Explorer radial
                                 velocity measurements
table2.dat        31       54   Multi-Telescope Telescope radial velocity
                                 measurements
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units  Label   Explanations
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   1-  5  I5    ---    SWP     The IUE SWP camera image number
   7- 18  F12.4 d      JD      Julian date
  21- 24  F4.1  km/s   Vr      Final radial velocity
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Byte-by-byte Description of file: table2.dat
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   Bytes Format Units  Label   Explanations
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   1- 11  F11.3 d      JD      Julian date
  13- 17  F5.1  km/s   Valpha  Radial velocity of H{alpha}
  20- 24  F5.1  km/s   VHeI    Radial velocity of He I 6678{AA}
  27- 31  F5.1  km/s   Vr      Final mean radial velocity
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History:
    From ApJ electronic edition
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(End)                                          Greg Schwarz [AAS]    27-Apr-2000