2015ApJ...815....3B

Query : 2015ApJ...815....3B

2015ApJ...815....3B - Astrophys. J., 815, 3 (2015/December-2)

Density determinations of the coronae of cool stars using a newly assigned pair of Fe xiv lines in the spectra of alpha Canis Minor, alpha Centauri, and the Sun.

BEIERSDORFER P., HELL N., LEPSON J.K., DIAZ F. and ISHIKAWA Y.

Abstract (from CDS):

We have identified a previously unassigned pair of lines between 169 and 170 Å in the coronae of cool stars. We attribute these lines to Fe xiv and show that their intensity ratio is sensitive to the electron density. Using observations taken with the Low Energy Transmission Grating Spectrometer of the Chandra X-ray Observatory we infer a density of log(ne//cm3) = 10.2±0.7 and 10.3±0.8 from the newly identified line pair in the coronae of Procyon and α Cen A, respectively.

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Journal keyword(s): atomic processes - line: formation - stars: coronae - stars: individual: (Procyon, Alpha Centauri) - Sun: X-rays, gamma-rays

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1925 0
2 NAME Proxima Centauri PM* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1483 0
3 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 1092 2
4 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1352 1
5 * alf Cen ** 14 39 36.50 -60 50 02.3   0.4 -0.1     G2V+K1V 1031 0

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