2008MNRAS.390..567M

Query : 2008MNRAS.390..567M

2008MNRAS.390..567M - Mon. Not. R. Astron. Soc., 390, 567-581 (2008/October-3)

Large-scale magnetic topologies of mid M dwarfs.

MORIN J., DONATI J.-F., PETIT P., DELFOSSE X., FORVEILLE T., ALBERT L., AURIERE M., CABANAC R., DINTRANS B., FARES R., GASTINE T., JARDINE M.M., LIGNIERES F., PALETOU F., RAMIREZ VELEZ J.C. and THEADO S.

Abstract (from CDS):

We present in this paper, the first results of a spectropolarimetric analysis of a small sample (∼20) of active stars ranging from spectral type M0 to M8, which are either fully convective or possess a very small radiative core. This study aims at providing new constraints on dynamo processes in fully convective stars.

This paper focuses on five stars of spectral type ∼M4, i.e. with masses close to the full convection threshold (≃0.35M☉), and with short rotational periods. Tomographic imaging techniques allow us to reconstruct the surface magnetic topologies from the rotationally modulated time-series of circularly polarized profiles. We find that all stars host mainly axisymmetric large-scale poloidal fields. Three stars were observed at two different epochs separated by ∼1 yr; we find the magnetic topologies to be globally stable on this time-scale.

We also provide an accurate estimation of the rotational period of all stars, thus allowing us to start studying how rotation impacts the large-scale magnetic field.


Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): techniques: polarimetric - stars: activity - stars: low-mass, brown dwarfs - stars: magnetic fields - stars: rotation

VizieR on-line data: <Available at CDS (J/MNRAS/390/567): table1.dat tables.dat>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* YZ CMi PM* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 957 0
2 V* AD Leo PM* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1469 1
3 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0V 959 0
4 V* V374 Peg PM* 22 01 13.1241989539 +28 18 24.907312662       11.602   M3.5Ve 259 0
5 V* EV Lac PM* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 993 2
6 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M3.5V 469 0
7 BD+19 5116B PM* 23 31 52.5753377942 +19 56 14.005026315   14.8   12.165   M4.0Ve 222 0

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