TY - GEN
T1 - Long-term magnetic field stability of Vega
AU - Alina, D.
AU - Petit, P.
AU - Lignières, F.
AU - Wade, G. A.
AU - Fares, R.
AU - Aurière, M.
AU - Böhm, T.
AU - Carfantan, H.
PY - 2012
Y1 - 2012
N2 - We present new spectropolarimetric observations of the normal A-type star Vega, obtained during the summer of 2010 with NARVAL at Télescope Bernard Lyot (Pic du Midi Observatory). This new time-series is constituted of 615 spectra collected over 6 different nights. We use the Least-Square-Deconvolution technique to compute, from each spectrum, a mean line profile with a signal-to-noise ratio close to 20,000. After averaging all 615 polarized observations, we detect a circularly polarized Zeeman signature consistent in shape and amplitude with the signatures previously reported from our observations of 2008 and 2009. The surface magnetic geometry of the star, reconstructed using the technique of Zeeman-Doppler Imaging, agrees with the maps obtained in 2008 and 2009, showing that most recognizable features of the photospheric field of Vega are only weakly distorted by large-scale surface flows (differential rotation or meridional circulation).
AB - We present new spectropolarimetric observations of the normal A-type star Vega, obtained during the summer of 2010 with NARVAL at Télescope Bernard Lyot (Pic du Midi Observatory). This new time-series is constituted of 615 spectra collected over 6 different nights. We use the Least-Square-Deconvolution technique to compute, from each spectrum, a mean line profile with a signal-to-noise ratio close to 20,000. After averaging all 615 polarized observations, we detect a circularly polarized Zeeman signature consistent in shape and amplitude with the signatures previously reported from our observations of 2008 and 2009. The surface magnetic geometry of the star, reconstructed using the technique of Zeeman-Doppler Imaging, agrees with the maps obtained in 2008 and 2009, showing that most recognizable features of the photospheric field of Vega are only weakly distorted by large-scale surface flows (differential rotation or meridional circulation).
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U2 - 10.1063/1.3701905
DO - 10.1063/1.3701905
M3 - Conference contribution
AN - SCOPUS:84861436109
SN - 9780735410121
T3 - AIP Conference Proceedings
SP - 82
EP - 85
BT - Stellar Polarimetry
T2 - Stellar Polarimetry: From Birth to Death
Y2 - 27 June 2011 through 30 June 2011
ER -