Ultra-High-Precision Velocity Measurements of Oscillations in Centauri A | Zendy

R. Paul Butler | Zendy; T. R. Bedding | Zendy; H. Kjeldsen | Zendy; C. McCarthy | Zendy; S. J. O’Toole | Zendy; C. G. Tinney | Zendy; Geoffrey W. Marcy | Zendy; Jason T. Wright | Zendy

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Ultra-High-Precision Velocity Measurements of Oscillations in Centauri A

Author(s) -

R. Paul Butler,

T. R. Bedding,

H. Kjeldsen,

C. McCarthy,

S. J. O’Toole,

C. G. Tinney,

Geoffrey W. Marcy,

Jason T. Wright

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/381434

Subject(s) - physics , radial velocity , wavelength , astrophysics , noise (video) , optics , stars , artificial intelligence , computer science , image (mathematics)

We have made differential radial velocity measurements of the star alpha CenA using two spectrographs, UVES and UCLES, both with iodine absorption cellsfor wavelength referencing. Stellar oscillations are clearly visible in thetime series. After removing jumps and slow trends in the data, we show that theprecision of the velocity measurements per minute of observing time is 0.42 m/sfor UVES and 1.0 m/s for UCLES, while the noise level in the Fourier spectrumof the combined data is 1.9 cm/s. As such, these observations represent themost precise velocities ever measured on any star apart from the Sun.Comment: ApJ Letters (accepted

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