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28 March 2024
 
  » arxiv » astro-ph/0205082

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High-Resolution Measurements of Intersystem Bands of Carbon Monoxide toward X Persei
Yaron Sheffer ; S. R. Federman ; David L. Lambert ;
Date 6 May 2002
Journal Astrophys.J. 572 (2002) L95
Subject astro-ph
AffiliationToledo), S. R. Federman (Toledo), David L. Lambert (Texas
AbstractIn an echelle spectrum of X Per acquired with the Space Telescope Imaging Spectrograph we have identified individual rotational lines of 11 triplet-singlet (intersystem) absorption bands of ^12CO. Four bands provide first detections for interstellar clouds. From a comparison with the zeta Oph sight line we find that X Per is obscured by a higher 12CO column density of 1.4 x 10^16 cm-2. Together with the high spectral resolution of 1.3 km s-1, this allows (i) an improved measurement of previously published f-values for seven bands, and (ii) an extraction of the first astrophysical oscillator strengths for d-X (8-0), (9-0), and (10-0), as well as for e-X (12-0). The ^13CO d-X (12-0) band, previously suspected to exist toward zeta Oph, is now readily resolved and modeled. Our derived intersystem f-values for ^12CO include a few mild (leq 34%) disagreements with recent predictions from a perturbation analysis calculated for the interstellar excitation temperature. Overall, the comparison confirms the superiority of employing multiple singlet levels in the calculations of mixing coefficients over previous single-level predictions.
Source arXiv, astro-ph/0205082
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