[Alii] in the ultraviolet spectrum of the symbiotic star RR Telescopii
Item Type:Journal Article
Citation:F. P. Keenan, B. R. Espey, M. Mathioudakis, K. M. Aggarwal, F. L. Crawford, '[Alii] in the ultraviolet spectrum of the symbiotic star RR Telescopii' in Monthly Notices of the Royal Astronomical Society, 309, 1999, pp. 195-198.
[Al ii] in the ultraviolet spectrum of the symbiotic star RR Telescopii.pdf (publisher pdf) 94.20Kb
An inspection of a GHRS/HST spectrum of the symbiotic star RR Telescopii reveals the presence of the [Alii] 3s^2 ^1S - 3s3p ^3P_2 line at a vacuum wavelength of 2661.06+/-0.08?, 8.89+/-0.08? away from the Alii] 3s^2 ^1S - 3s3p ^3P_1 intercombination transition at 2669.95?, in good agreement with the theoretical prediction of ??=8.80?. We also find that the Alii] line profile is asymmetric, showing a strong low-density component with a weak high-density wing, redshifted by 30kms^-1, in agreement with the findings of Schild & Schmid, which were based on optical observations. Our measurement of the emission-line ratio RI(2661.06?)/I(2669.95?)=0.027+/-0.003 implies logN_e=5.8+/-0.2, in good agreement with the densities found from other ions, such as Siiii. These results provide strong evidence that we have detected the [Alii] line, the first time (to our knowledge) that this feature has been reliably identified in an astrophysical or laboratory spectrum.
Author: ESPEY, BRIAN RUSSELL
Type of material:Journal Article
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