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Article overview
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Soft X-ray emissions of highly charged Si VII--Si XII in cool star--Procyon | | G.Y. Liang
; G. Zhao
; | | Date: |
14 Nov 2007 | | Abstract: | Different observation data for cool star--Procyon (Obs\_IDs of 63, 1461 and
1224) available from {it Chandra Data Public Archive} were co-added and
analyzed. Emissivities of emission lines of highly charged silicon ions (Si
VII--Si XII) were calculated over temperatures by adopting the published data
of Liang et al. (2007, {it Atom. Data and Nucl. Data Tables}, {f 93}, 375).
Using the emission measure derived by Raassen et al. (2002, A&A, {f 389},
228), the theoretical line fluxes are predicted, and the theoretical spectra
are constructed by assuming the Gaussian profile with instrumental broadening
(0.06 AA). By detailed comparison between observation and predictions, several
emissions lines are identified firstly such as emissions at 43.663 AA (Si XI),
45.550 AA (Si XII), 46.179 AA (Si VIII), 50.874 AA (Si X), 64.668 AA (Si
IX), and 73.189 AA (Si VII) etc. Several emission lines are re-assigned in
this work, such as the emission line at 52.594 AA to Si X (52.612 AA), at
69.641 AA to the blending of Si VII (69.632 AA) and Si VIII (69.664 AA)
lines, as well as at 70.050 AA to Si VII (70.027 AA). The prediction reveals
the large discrepancies between the $3s$--$2p$ line (63.715 AA) {it versus}
3d--$2p$ line (61.012 AA) again for lower charge stage Si VIII. Solar flare
observation is also added for the assessment of present calculation. Different
assignments for some lines between Procyon and solar flare, have been found to
be due to the hotter emitter in Sun than in Procyon coronae. | | Source: | arXiv, 0711.2215 | | Services: | Forum | Review | PDF | Favorites | |
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