Temperature Measurements Using the Dielectronic Satellite Lines of Fe XVII

被引：19

作者：

Beiersdorfer, P. ^{[1
,2
]}

Hell, N. ^{[1
]}

Lepson, J. K. ^{[2
]}

机构：

[1] Lawrence Livermore Natl Lab, Phys Div, Livermore, CA 94550 USA

[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 864卷 / 01期

关键词：

atomic processes; line: formation; stars: coronae; stars:; individual; (Procyon; Capella); X-rays: general; COLLISIONAL IONIZATION EQUILIBRIUM; X-RAY-SPECTRUM; LABORATORY MEASUREMENTS; RELATIVE INTENSITY; RATE COEFFICIENTS; INNER-SHELL; TRANSITIONS; SOLAR; RECOMBINATION; CAPELLA;

D O I：

10.3847/1538-4357/aad27f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The coronal temperature of Capella and Procyon has been derived from the spectral emission of Fe XVII observed in high resolution with Chandra's High Energy Transmission Grating Spectrometer. The measurement makes use of well resolved dielectronic satellite features with a spectator electron in the n = 4 shell. This method does not require a priori knowledge of the ionization equilibrium or of the elemental abundances. We find the temperature of Fe XVII emission is 264(-51)(+142) eV for Procyon and 514(-25)(+27) eV for Capella, i.e., 3.1 and 6.0 MK, respectively. The Procyon measurement is based on three X-rays observed in the dielectronic satellite feature, which illustrates the power of the method even for low-signal observations.

引用

页数：5

共 34 条

[1] The Chandra iron-L X-ray line spectrum of Capella [J].

Behar, E ;

Cottam, J ;

Kahn, SM .

ASTROPHYSICAL JOURNAL, 2001, 548 (02) :966-975

[2] INDIRECT X-RAY-LINE FORMATION PROCESSES IN HIGHLY CHARGED BARIUM [J].

BEIERSDORFER, P ;

OSTERHELD, AL ;

CHEN, MH ;

HENDERSON, JR ;

KNAPP, DA ;

LEVINE, MA ;

MARRS, RE ;

REED, KJ ;

SCHNEIDER, MB ;

VOGEL, DA .

PHYSICAL REVIEW LETTERS, 1990, 65 (16) :1995-1998

[3] L-SHELL DIELECTRONIC SATELLITE TRANSITIONS OF Fe XVII [J].

Beiersdorfer, P. ;

Bode, M. P. ;

Ishikawa, Y. ;

Diaz, F. .

ASTROPHYSICAL JOURNAL, 2014, 793 (02)

[4] Laboratory measurements of the Fe XVII 2p-3s and 2p-3d transitions and comparison with solar and astrophysical observations [J].

Beiersdorfer, P ;

Bitter, M ;

von Goeler, S ;

Hill, KW .

ASTROPHYSICAL JOURNAL, 2004, 610 (01) :616-623

[5] Laboratory X-ray astrophysics [J].

Beiersdorfer, P .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 2003, 41 :343-390

[6] Laboratory measurements of the relative intensity of the 3s→2p and 3d→2p transitions in Fe XVII [J].

Beiersdorfer, P ;

Behar, E ;

Boyce, KR ;

Brown, GV ;

Chen, H ;

Gendreau, KC ;

Gu, MF ;

Gygax, J ;

Kahn, SM ;

Kelley, RL ;

Porter, FS ;

Stahle, CK ;

Szymkowiak, AE .

ASTROPHYSICAL JOURNAL, 2002, 576 (02) :L169-L172

[7] Measurement of the 3d→2p resonance to intercombination line-intensity ratio in neonlike Fe XVII, Ge XXIII, and Se XXV -: art. no. 032705 [J].

Beiersdorfer, P ;

von Goeler, S ;

Bitter, M ;

Thorn, DB .

PHYSICAL REVIEW A, 2001, 64 (03) :6

[8]

Beiersdorfer P., 2011, ASTRONOMICAL SOC PAC, V448, P787

[9]

Beiersdorfer P., 1988, THESIS

[10] An unexpectedly low oscillator strength as the origin of the Fe XVII emission problem [J].

Bernitt, S. ;

Brown, G. V. ;

Rudolph, J. K. ;

Steinbruegge, R. ;

Graf, A. ;

Leutenegger, M. ;

Epp, S. W. ;

Eberle, S. ;

Kubicek, K. ;

Maeckel, V. ;

Simon, M. C. ;

Traebert, E. ;

Magee, E. W. ;

Beilmann, C. ;

Hell, N. ;

Schippers, S. ;

Mueller, A. ;

Kahn, S. M. ;

Surzhykov, A. ;

Harman, Z. ;

Keitel, C. H. ;

Clementson, J. ;

Porter, F. S. ;

Schlotter, W. ;

Turner, J. J. ;

Ullrich, J. ;

Beiersdorfer, P. ;

Lopez-Urrutia, J. R. Crespo .

NATURE, 2012, 492 (7428) :225-228

← 1 2 3 4 →