131 citations · 486 across the 9 of their papers we have counts for
9 papers
Stable magnetic fields and changing starspots on Vega -- An ultra-deep decadal survey at Pic du Midi and OHP
T. Böhm, M. Holschneider, P. Petit +4
Monitoring magnetic and activity variations in A- and B-type stars with ultra-weak magnetic fields is essential to understand the origin and evolution of these fields in this regio…
The different origins of magnetic fields and activity in the Hertzsprung gap stars, OU Andromedae and 31 Comae
A. Borisova, M. Aurière, P. Petit +3
Context: When crossing the Hertzsprung gap, intermediate-mass stars develop a convective envelope. Fast rotators on the main sequence, or Ap star descendants, are expected to becom…
The Magnetic Fields at the Surface of Active Single G-K Giants
M. Aurière, R. Konstantinova-Antova, C. Charbonnel +15
We investigate the magnetic field at the surface of 48 red giants selected as promising for detection of Stokes V Zeeman signatures in their spectral lines. We use the spectropolar…
A search for weak or complex magnetic fields in the the B3V star iota Herculis
G. A. Wade, C. P. Folsom, P. Petit +4
We obtained 128 high signal-to-noise ratio Stokes spectra of the B3V star ~Her on 5 consecutive nights in 2012 with the ESPaDOnS spectropolarimeter at the Canada-France-Hawa…
Search for surface magnetic fields in Mira stars. First detection in chi Cyg
A. Lèbre, M. Aurière, N. Fabas +4
In order to complete the knowledge of the magnetic field and of its influence during the transition from Asymptotic Giant Branch to Planetary Nebulae stages, we have undertaken a s…
Magnetic field structure in single late-type giants: Beta Ceti in 2010 - 2012
S. Tsvetkova, P. Petit, M. Auriere +5
The data were obtained using two spectropolarimeters - Narval at the Bernard Lyot Telescope, Pic du Midi, France, and ESPaDOnS at CFHT, Hawaii. Thirty-eight circularly-polarized sp…
Direct detection of a magnetic field in the photosphere of the single M giant EK Boo: How common is magnetic activity among M giants?
R. Konstantinova-Antova, M. Auriere, C. Charbonnel +6
We study the fast rotating M5 giant EK Boo by means of spectropolarimetry to obtain direct and simultaneous measurements of both the magnetic field and activity indicators, in orde…
The magnetic field of Betelgeuse: a local dynamo from giant convection cells?
M. Auriere, J. -F. Donati, R. Konstantinova-Antova +3
Betelgeuse is an M supergiant with a complex and extended atmosphere, which also harbors spots and giant granules at its surface. A possible magnetic field could contribute to the…
First evidence of a magnetic field on Vega. Towards a new class of magnetic A-type stars
F. Lignieres, P. Petit, T. Bohm +1
We report the detection of a magnetic field on Vega through spectropolarimetric observations. We acquired 257 Stokes V, high signal-to-noise and high-resolution echelle spectra dur…