DENSITY DETERMINATIONS OF THE CORONAE OF COOL STARS USING A NEWLY ASSIGNED PAIR OF Fe xiv LINES IN THE SPECTRA OF α CANIS MINOR, α CENTAURI, AND THE SUN

Journal Article · Thu Dec 10 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/815/1/3· OSTI ID:22521808

Beiersdorfer, P.; Hell, N. ^[1]; Lepson, J. K. ^[2]; Diaz, F.

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1. Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States)
2. Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States)

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(n{sub e}/cm{sup −3})  =  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.

• OSTI ID: 22521808
• Journal Information: Astrophysical Journal, Vol. 815, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DENSITY
ELECTRON DENSITY
EMISSION SPECTRA
GAMMA RADIATION
IRON IONS
POWER TRANSMISSION
STELLAR CORONAE
SUN
X RADIATION