Long-term magnetic field stability of Vega

Details Long-term magnetic field stability of Vega Long-term magnetic field stability of Vega

2011-07-28

arxiv.org/abs/1107.5639v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Proceedings of the conference "Stellar polarimetry: from birth to death", 2011 Jun 27-30, Madison

Scientific paper

We present new spectropolarimetric observations of the normal A-type star Vega, obtained during the summer of 2010 with NARVAL at T\'elescope 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).

Affiliated with

Also associated with

No associations

Rating

Long-term magnetic field stability of Vega does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Long-term magnetic field stability of Vega, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long-term magnetic field stability of Vega will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-413801