Ultra-htgh-precision velocity measurements of oscillations in α Centauri A

R. Paul Butler; Timothy R. Bedding; Hans Kieldsen; Chris McCarthy; Simon J. O'Toole; Christopher G. Tinney; Geoffrey W. Marcy; Jason T. Wright

doi:10.1086/381434

Ultra-htgh-precision velocity measurements of oscillations in α Centauri A

R. Paul Butler, Timothy R. Bedding, Hans Kieldsen, Chris McCarthy, Simon J. O'Toole, Christopher G. Tinney, Geoffrey W. Marcy, Jason T. Wright

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109 Scopus citations

Abstract

We have made differential radial velocity measurements of the star α Centauri A using two spectrographs, the UV-Visual Echelle Spectrograph (UVES) and the University College London Echelle Spectrograph (UCLES), both with iodine absorption cells for wavelength referencing. Stellar oscillations are clearly visible in the time series. After removing jumps and slow trends in the data, we show that the precision of the velocity measurements per minute of observing time is 0.42 m s^-1 for UVES and 1.0 m s^-1 for UCLES, while the noise level in the Fourier spectrum of the combined data is 1. 9 cm s^-1. As such, these observations represent the most precise velocities ever measured on any star apart from the Sun.

Original language	English (US)
Pages (from-to)	L75-L78
Journal	Astrophysical Journal
Volume	600
Issue number	1 II
DOIs	https://doi.org/10.1086/381434
State	Published - Jan 1 2004

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/381434

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title = "Ultra-htgh-precision velocity measurements of oscillations in α Centauri A",

abstract = "We have made differential radial velocity measurements of the star α Centauri A using two spectrographs, the UV-Visual Echelle Spectrograph (UVES) and the University College London Echelle Spectrograph (UCLES), both with iodine absorption cells for wavelength referencing. Stellar oscillations are clearly visible in the time series. After removing jumps and slow trends in the data, we show that the precision of the velocity measurements per minute of observing time is 0.42 m s-1 for UVES and 1.0 m s-1 for UCLES, while the noise level in the Fourier spectrum of the combined data is 1. 9 cm s-1. As such, these observations represent the most precise velocities ever measured on any star apart from the Sun.",

author = "Butler, {R. Paul} and Bedding, {Timothy R.} and Hans Kieldsen and Chris McCarthy and O'Toole, {Simon J.} and Tinney, {Christopher G.} and Marcy, {Geoffrey W.} and Wright, {Jason T.}",

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TY - JOUR

T1 - Ultra-htgh-precision velocity measurements of oscillations in α Centauri A

AU - Butler, R. Paul

AU - Bedding, Timothy R.

AU - Kieldsen, Hans

AU - McCarthy, Chris

AU - O'Toole, Simon J.

AU - Tinney, Christopher G.

AU - Marcy, Geoffrey W.

AU - Wright, Jason T.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - We have made differential radial velocity measurements of the star α Centauri A using two spectrographs, the UV-Visual Echelle Spectrograph (UVES) and the University College London Echelle Spectrograph (UCLES), both with iodine absorption cells for wavelength referencing. Stellar oscillations are clearly visible in the time series. After removing jumps and slow trends in the data, we show that the precision of the velocity measurements per minute of observing time is 0.42 m s-1 for UVES and 1.0 m s-1 for UCLES, while the noise level in the Fourier spectrum of the combined data is 1. 9 cm s-1. As such, these observations represent the most precise velocities ever measured on any star apart from the Sun.

AB - We have made differential radial velocity measurements of the star α Centauri A using two spectrographs, the UV-Visual Echelle Spectrograph (UVES) and the University College London Echelle Spectrograph (UCLES), both with iodine absorption cells for wavelength referencing. Stellar oscillations are clearly visible in the time series. After removing jumps and slow trends in the data, we show that the precision of the velocity measurements per minute of observing time is 0.42 m s-1 for UVES and 1.0 m s-1 for UCLES, while the noise level in the Fourier spectrum of the combined data is 1. 9 cm s-1. As such, these observations represent the most precise velocities ever measured on any star apart from the Sun.

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JO - Astrophysical Journal

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IS - 1 II

ER -

Ultra-htgh-precision velocity measurements of oscillations in α Centauri A

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