X-Ray Emission from Utracool Stars

被引：1

作者：

Zaitsev, V. V. ^{[1
]}

Stepanov, A., V ^{[2
,3
]}

机构：

[1] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod, Russia

[2] Russian Acad Sci, Main Pulkovo Astron Observ, Nizhnii Novgorod, Russia

[3] AF Ioffe Phys Tech Inst, St Petersburg, Russia

来源：

RADIOPHYSICS AND QUANTUM ELECTRONICS | 2021年 / 64卷 / 06期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

SIMULTANEOUS MULTIWAVELENGTH OBSERVATIONS; MAGNETIC ACTIVITY; BROWN DWARF; BONA-FIDE; ULTRACOOL DWARFS; RADIO-EMISSION; DISSIPATION; CONSTRAINTS; CORONAE; TRENDS;

D O I：

10.1007/s11141-022-10140-z

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We study two possibilities of the origin of quiescent X-ray emission from ultracool stars using the examples of brown dwarfs TVLM 513-46546 and VB 10: (a) radiation from hot coronas and (b) radiation from a system of magnetic loops filled with a sufficiently dense hot plasma heated due to the dissipation of electric currents flowing in the loops. The parameters of the corona, as well as the parameters of the loops and their number, which are necessary for the implementation of the observed X-ray emission measure, have been determined. For the studied brown dwarfs, the generation of X-rays by a set of hot loops is energetically more favorable than in the case of a hot corona, which was also confirmed by the results of the analysis of quiescent microwave radiation from the brown dwarf TVLM 513-46546.

引用

页码：379 / 387

页数：9

共 38 条

[1] Simultaneous multiwavelength observations of magnetic activity in ultracool dwarfs. II. Mixed trends in VB 10 and LSR 1835+32 and the possible role of rotation [J].

Berger, E. ;

Basri, G. ;

Gizis, J. E. ;

Giampapa, M. S. ;

Rutledge, R. E. ;

Liebert, J. ;

Martin, E. ;

Fleming, T. A. ;

Johns-Krull, C. M. ;

Phan-Bao, N. ;

Sherry, W. H. .

ASTROPHYSICAL JOURNAL, 2008, 676 (02) :1307-1318

[2] Simultaneous multiwavelength observations of magnetic activity in ultracool dwarfs.: I.: The complex behavior of the M8.5 dwarf TVLM 513-46546 [J].

Berger, E. ;

Gizis, J. E. ;

Giampapa, M. S. ;

Rutledge, R. E. ;

Liebert, J. ;

Martin, E. ;

Basri, G. ;

Fleming, T. A. ;

Johns-Krull, C. M. ;

Phan-Bao, N. ;

Sherry, W. H. .

ASTROPHYSICAL JOURNAL, 2008, 673 (02) :1080-1087

[3] SIMULTANEOUS MULTI-WAVELENGTH OBSERVATIONS OF MAGNETIC ACTIVITY IN ULTRACOOL DWARFS. III. X-RAY, RADIO, AND Hα ACTIVITY TRENDS IN M AND L DWARFS [J].

Berger, E. ;

Basri, G. ;

Fleming, T. A. ;

Giampapa, M. S. ;

Gizis, J. E. ;

Liebert, J. ;

Martin, E. ;

Phan-Bao, N. ;

Rutledge, R. E. .

ASTROPHYSICAL JOURNAL, 2010, 709 (01) :332-341

[4] X-ray detections of two young bona-fide brown dwarfs [J].

Bouy, H .

ASTRONOMY & ASTROPHYSICS, 2004, 424 (02) :619-625

[5] The quiescent corona of VB 10 [J].

Fleming, TA ;

Giampapa, MS ;

Garza, D .

ASTROPHYSICAL JOURNAL, 2003, 594 (02) :982-986

[6] An X-ray flare detected on the M8 dwarf VB 10 [J].

Fleming, TA ;

Giampapa, MS ;

Schmitt, JHMM .

ASTROPHYSICAL JOURNAL, 2000, 533 (01) :372-377

[7] A new sample of nearby M dwarfs discovered by ROSAT [J].

Fleming, TA .

ASTROPHYSICAL JOURNAL, 1998, 504 (01) :461-467

[8]

Gershberg R. E., 2020, PHYS MEDIUMAND LOW M

[9] The coronae of low-mass dwarf stars [J].

Giampapa, MS ;

Rosner, R ;

Kashyap, V ;

Fleming, TA ;

Schmitt, JHMM ;

Bookbinder, JA .

ASTROPHYSICAL JOURNAL, 1996, 463 (02) :707-725

[10]

Huddlestone R., 1965, Plasma Diagnostics Techniques

← 1 2 3 4 →