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 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:
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RA (2000) DE Designation(s)
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00 13 14.2 +15 11 01 gamma Peg = HR 39
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
obsgpeg.dat 20 1079 Radial velocities of gamma Peg
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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
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
15- 20 F6.2 km/s RV Radial velocity
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Acknowledgements: Philippe Mathias, Philippe.MATHIAS(at)obs-nice.fr
(End) Patricia Vannier [CDS] 27-Dec-2005