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J/A+A/448/697       Radial velocity of gamma Pegasi          (Chapellier+, 2006)
An hybrid beta Cephei-SPB star in a binary system: gamma Pegasi.
    Chapellier E., Le Contel D., Le Contel J.-M., Mathias P., Valtier J.-C.
    <Astron. Astrophys. 448, 697 (2006)>
    =2006A&A...448..697C
ADC_Keywords: Stars, variable ; Radial velocities

Keywords: stars: binaries: spectroscopic - stars: oscillations -
          stars: variables: beta Cephei - stars: variables: general

Abstract:
    High resolution and high signal to noise ratio spectroscopic
    observations of the classical β Cephei star γ Peg were
    obtained between 1991 and 2005. The analysis of these data combined
    with previously published results shows that γ Peg is a
    spectroscopic binary with an orbital period of 370.5d. We discovered
    three new frequencies in addition to the well-known 6.5897d-1
    (0.15175d) one. That at 6.01d-1 is a typical Cephei frequency. The
    two others at 0.68 and 0.87d-1 are similar to the high degree g-mode
    frequencies found in SPB stars. Thus, γ Peg is a hybrid β
    Cephei-SPB star. Its position in the HR diagram is compatible with
    such a status. In addition, a small increase of the main period has
    been detected between the 1995 and 2005 observations.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE    Designation(s)
    ----------------------------------------------------------
    00 13 14.2 +15 11 01   gamma Peg = HR 39
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
obsgpeg.dat       20     1079   Radial velocities of gamma Peg


See also:
 J/ApJS/158/193 : Catalog of Galactic β Cephei stars (Stankov+, 2005)
 J/A+A/304/406  : Photometry and radial velocities of 16 Lac (Chapellier+, 1995)
 J/A+A/286/136  : Radial velocities of four beta Cep variables (Aerts+ 1994)


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

   Bytes Format Units   Label     Explanations

   1- 13  F13.5 d       HJD       Heliocentric Julian date
  15- 20  F6.2  km/s    RV        Radial velocity


Acknowledgements: Philippe Mathias, Philippe.MATHIAS(at)obs-nice.fr

(End)                                        Patricia Vannier [CDS]  27-Dec-2005