2008A&A...489L..45R


Query : 2008A&A...489L..45R

2008A&A...489L..45R - Astronomy and Astrophysics, volume 489, L45-48 (2008/10-3)

The moderate magnetic field of the flare star Proxima Centauri.

REINERS A. and BASRI G.

Abstract (from CDS):

We report moderate magnetic flux of 450G<Bf<750G (3σ) on the nearby M5.5 flare star Proxima Centauri. A high resolution UVES spectrum was used to measure magnetic flux from Zeeman broadening in absorption lines of molecular FeH around 1µm. The magnetic flux we find is relatively weak compared with classical strong flare stars, but so are Proxima's flaring rates and actual emission levels. We compare what is known about the rotation rate, Rossby number, and activity levels in this star to relations between these quantities that are being developed more generally for M dwarfs. We conclude that the magnetic flux is higher than the best estimates of the Rossby number from period measurements. On the other hand, the activity levels of Proxima Centauri are at the high end of what could be expected based on the measured field, but not so high as to exceed the natural scatter in these relations (other stars lie along this high envelope as well).

Abstract Copyright:

Journal keyword(s): stars: activity - stars: late-type - stars: individual: Proxima Centauri - stars: magnetic fields - stars: low-mass, brown dwarfs

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 - 2022
#notes
1 G 158-27 PM* 00 06 43.1973190107 -07 32 17.019101068     13.837 13.605 10.15 M5.5V 190 0
2 G 272-61B Er* 01 39 01.6377185550 -17 57 01.001240728           M6V 824 0
3 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 678 0
4 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1142 0
5 V* EV Lac Er* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 852 2
6 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M4+M5 434 0
7 G 157-77 PM* 23 35 10.4624266947 -02 23 20.613547105   16.60 14.69 14.447   M5.0Ve 79 0

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2022.08.09-03:56:16

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