2011A&A...534A.133F


Query : 2011A&A...534A.133F

2011A&A...534A.133F - Astronomy and Astrophysics, volume 534A, 133-133 (2011/10-1)

Multi-wavelength observations of Proxima Centauri.

FUHRMEISTER B., LALITHA S., POPPENHAEGER K., RUDOLF N., LIEFKE C., REINERS A., SCHMITT J.H.M.M. and NESS J.-U.

Abstract (from CDS):

We report simultaneous observations of the nearby flare star Proxima Centauri with VLT/UVES and XMM-Newton over three nights in March 2009. Our optical and X-ray observations cover the star's quiescent state, as well as its flaring activity and allow us to probe the stellar atmospheric conditions from the photosphere into the chromosphere, and then the corona during its different activity stages. Using the X-ray data, we investigate variations in coronal densities and abundances and infer loop properties for an intermediate-sized flare. The optical data are used to investigate the magnetic field and its possible variability, to construct an emission line list for the chromosphere, and use certain emission lines to construct physical models of Proxima Centauri's chromosphere. We report the discovery of a weak optical forbidden FeXIII line at 3388Å during the more active states of Proxima Centauri. For the intermediate flare, we find two secondary flare events that may originate in neighbouring loops, and discuss the line asymmetries observed during this flare in HI, HeI, and CaII lines. The high time-resolution in the Hα line highlights strong temporal variations in the observed line asymmetries, which re-appear during a secondary flare event. We also present theoretical modelling with the stellar atmosphere code PHOENIX to construct flaring chromospheric models.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: magnetic field - stars: chromospheres - stars: coronae - stars: late-type - stars: individual: Proxima Centauri

VizieR on-line data: <Available at CDS (J/A+A/534/A133): table6.dat>

Simbad objects: 10

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Number of rows : 10
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 189 0
2 V* YZ CMi Er* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 826 0
3 V* AZ Cnc Er* 08 40 29.6791626163 +18 24 08.726250637   19.2 17.59 16.6 13.45 M6.0V 79 0
4 G 9-38 ** 08 58 15.061776 +19 45 46.96020   15.58   13.40   M7V+M7V 101 0
5 G 9-38A PM* 08 58 15.0749311179 +19 45 48.258121374     13.93     M8Ve 88 0
6 BD+20 2465 Er* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1225 0
7 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 671 0
8 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1129 0
9 V* AT Mic Er* 20 41 51.15925 -32 26 06.8283 12.753 11.909 10.343 9.098 7.383 M4.5Ve+M4.5Ve 342 0
10 V* EV Lac Er* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0V 847 2

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2022.05.28-22:31:12

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