Long-term magnetic field stability of Vega

D. Alina, P. Petit, F. Lignières, G. A. Wade, R. Fares, M. Aurière, T. Böhm, H. Carfantan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)


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).

Original languageEnglish
Title of host publicationStellar Polarimetry
Subtitle of host publicationFrom Birth to Death
Number of pages4
Publication statusPublished - 2012
Externally publishedYes
EventStellar Polarimetry: From Birth to Death - Madison, WI, United States
Duration: Jun 27 2011Jun 30 2011

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceStellar Polarimetry: From Birth to Death
Country/TerritoryUnited States
CityMadison, WI

ASJC Scopus subject areas

  • General Physics and Astronomy


Dive into the research topics of 'Long-term magnetic field stability of Vega'. Together they form a unique fingerprint.

Cite this