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J/A+A/469/1069 Radial velocity curve of gamma Peg (Butkovskaya+, 2007)
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Beginning of ReadMe :J/A+A/469/1069 Radial velocity curve of gamma Peg (Butkovskaya+, 2007)
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A study of the beta Cephei star gamma Pegasi: binarity, magnetic field, rotation
and pulsations.
Butkovskaya V., Plachinda S.
<Astron. Astrophys. 469, 1069 (2007)>
=2007A&A...469.1069B
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ADC_Keywords: Stars, variable ; Radial velocities
Keywords: stars: magnetic fields - stars: early-type - stars: oscillations -
stars: binaries: spectroscopic - stars: individual: gamma Pegasi
Abstract:
With this work we provide observational material to study magnetic
field variability of the classical beta Cep-type star gamma Peg. The
observations were carried out in the HeI 6678 line in the course of
23 observing nights from 1997 to 2005 with using coude spectrograph in
spectropolarimetric mode at the Crimean 2.6m telescope. The behavior
of stellar wind was studied in the UV region using data from the IUE
satellite (the INES database). It is shown that the UV stellar wind
exhibits a variability. A variation of the wind due to stellar
pulsations has been detected. In the HeI 6678 line the abnormally
blueshifted radial velocities (gamma=-60.57+/-0.29km/s) were detected
during a single night in 2005.
We do not confirm the 370.5-day orbital period. The most probable
orbital period was estimated as P_orb_=6.81608+/-0.00012d. The ratio
P_orb_/P_puls_=44.92 appeared to be very close to integer. We have
detected the presence of weak magnetic field on the star. The
longitudinal component of the field varies from -10G to 30G with the
stellar rotation. The most probable rotational period is
P_rot_=6.6538+/-0.0016d. Both the orbital and the rotational
periods are integral multiple of the difference between them:
P_orb_/|P_orb_-P_rot_|=42.002, and P_rot_/|P_orb_-P_rot_|=41.002.
Variation of the longitudinal magnetic field during pulsation period
with an amplitude about 7G has been detected.
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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