The CARMENES search for exoplanets around M dwarfs Chromospheric modeling of M2-3V stars with PHOENIX

被引：11

作者：

Hintz, D. ^{[1
]}

Fuhrmeister, B. ^{[1
]}

Czesla, S. ^{[1
]}

Schmitt, J. H. M. M. ^{[1
]}

Johnson, E. N. ^{[2
]}

Schweitzer, A. ^{[1
]}

Caballero, J. A. ^{[3
]}

Zechmeister, M. ^{[2
]}

Jeffers, S., V ^{[2
]}

Reiners, A. ^{[2
]}

Ribas, I ^{[4
,5
]}

Amado, P. J. ^{[6
]}

Quirrenbach, A. ^{[7
]}

Anglada-Escude, G. ^{[6
,8
]}

Bauer, F. F. ^{[2
]}

Bejar, V. J. S. ^{[9
,10
]}

Cortes-Contreras, M. ^{[3
]}

Dreizler, S. ^{[2
]}

Galadi-Enriquez, D. ^{[11
]}

Guenther, E. W. ^{[9
,12
]}

Hauschildt, P. H. ^{[1
]}

Kaminski, A. ^{[7
]}

Kuerster, M. ^{[13
]}

Lafarga, M. ^{[4
,5
]}

Lopez del Fresno, M. ^{[3
]}

Montes, D. ^{[14
,15
]}

Morales, J. C. ^{[4
,5
]}

Passegger, V. M. ^{[1
]}

Seifert, W. ^{[7
]}

机构：

[1] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[2] Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[3] CSIC, INTA, Ctr Astrobiol, ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[4] CSIC, ICE, Campus UAB,C Can Magrans S-N, Barcelona 08193, Spain

[5] IEEC, Barcelona 08034, Spain

[6] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain

[7] Heidelberg Univ, Zentrum Astron, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg, Germany

[8] Queen Mary Univ London, Sch Phys & Astron, 327 Mile End Rd, London E1 4NS, England

[9] Inst Astrofis Canarias, C Via Lactea S-N, Tenerife 38205, Spain

[10] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain

[11] CSIC, Ctr Astron Hispano Aleman, MPG, Observatorio Astron Calar Alto, Gergal 04550, Almeria, Spain

[12] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[13] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[14] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra & Astrofis, E-28040 Madrid, Spain

[15] Univ Complutense Madrid, Fac Ciencias Fis, UPARCOS UCM, Unidad Fis Particulas & Cosmos UCM, E-28040 Madrid, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 623卷

关键词：

stars: activity; stars: chromospheres; stars: late-type; ATMOSPHERIC MODELS; RADIATIVE-TRANSFER; FLARE STARS; LINES; COMPONENTS;

D O I：

10.1051/0004-6361/201834788

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Chromospheric modeling of observed differences in stellar activity lines is imperative to fully understand the upper atmospheres of late-type stars. We present one-dimensional parametrized chromosphere models computed with the atmosphere code PHOENIX using an underlying photosphere of 3500 K. The aim of this work is to model chromospheric lines of a sample of 50 M2-3 dwarfs observed in the framework of the CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, exoplanet survey. The spectral comparison between observed data and models is performed in the chromospheric lines of Na I D-2, H alpha, and the bluest Ca II infrared triplet line to obtain best-fit models for each star in the sample. We find that for inactive stars a single model with a VAL C-like temperature structure is sufficient to describe simultaneously all three lines adequately. Active stars are rather modeled by a combination of an inactive and an active model, also giving the filling factors of inactive and active regions. Moreover, the fitting of linear combinations on variable stars yields relationships between filling factors and activity states, indicating that more active phases are coupled to a larger portion of active regions on the surface of the star.

引用

页数：21

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