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


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST07:40:50

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 - 2020
#notes
1 G 158-27 PM* 00 06 43.1972293497 -07 32 17.024270968     13.837 13.605 10.15 M5.5V 168 0
2 V* YZ CMi Er* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 782 0
3 V* AZ Cnc Er* 08 40 29.6796780769 +18 24 08.726610387   19.2 17.59 16.6 13.45 M6.0V 75 0
4 G 9-38 Er* 08 58 15.061776 +19 45 46.96020   15.58   13.40   M7V+M7V 98 0
5 G 9-38A PM* 08 58 15.0737928221 +19 45 48.243897495     13.93     M8Ve 87 0
6 BD+20 2465 Er* 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1152 0
7 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 M6Ve 633 0
8 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 966 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 326 0
10 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 802 2

    Equat.    Gal    SGal    Ecl

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2020.08.14-07:40:50

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