Multi-wavelength observations of Proxima Centauri
Multi-wavelength observations of Proxima Centauri
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比邻星的多波长观测
DOI:
10.1051/0004-6361/201117447
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发表时间:
2011
影响因子:
6.5
通讯作者:
J. H. M. M
中科院分区:
文献类型:
--
作者:
Fuhrmeister;Lalitha;Poppenhaeger;Rudolf;Liefke;Reiners;Schmitt;J. H. M. M
AimsWe report simultaneous observations of the nearby flare star Proxima Centauri with VLT/UVES andXMM-Newtonover 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.MethodsUsing 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.ResultsWe report the discovery of a weak optical forbidden Fe xiii line at 3388 Å 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 H i, He i, and Ca ii lines. The high time-resolution in the Hαline 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.
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影响因子:
3.5
作者:
J. Frogel;D. Kleinmann;W. Kunkel;E. Ney;D. W. Strecker
通讯作者:
D. W. Strecker
DOI:
10.1086/319418
发表时间:
2000
期刊:
The Astronomical Journal
影响因子:
--
作者:
I. Reid;A. Burgasser;K. Cruz;J. Kirkpatrick;J. Gizis
通讯作者:
J. Gizis
DOI:
10.1086/167658
发表时间:
1989
期刊:
The Astrophysical Journal
影响因子:
--
作者:
B. Dorman;Lorne A. Nelson;W. Y. Chau
通讯作者:
W. Y. Chau
影响因子:
6.5
作者:
I. Crespo;D. Montes;D. García;M. J. Fernández;J. Lopez;B. Foing;Dept. Astrofisica;Ucm;U. Madrid;H. C. F. Astrophysics;A. Observatory;I. A. D. Palermo;R. Division;Esa Space Science Dept.;ESTECSCI
通讯作者:
ESTECSCI
DOI:
10.1086/160866
发表时间:
1983-04
期刊:
The Astrophysical Journal
影响因子:
--
作者:
B. Haisch;J. Linsky;P. Bornmann;R. Stencel;S. Antiochos;L. Golub;G. Vaiana
通讯作者:
B. Haisch;J. Linsky;P. Bornmann;R. Stencel;S. Antiochos;L. Golub;G. Vaiana