Atomic Physics with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. II. Oscillator Strengths for Singly Ionized Iron

Details Atomic Physics with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. II. Oscillator Strengths for Singly Ionized Iron Atomic Physics with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. II. Oscillator Strengths for Singly Ionized Iron

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..275c&link_type=abstract

Astrophysical Journal v.452, p.275

Astronomy and Astrophysics

Astronomy

49

Atomic Processes, Ism: Abundances, Ultraviolet: Ism

Scientific paper

Moderate-to-high signal-to-noise interstellar absorption line data, obtained with the Goddard High-Resolution Spectrograph aboard the Hubble Space Telescope toward β1 Sco, HD 18100, and μ Col, are used to derive absolute oscillator strengths (f-values) for a number of weak and strong ultraviolet resonance transitions of Fe II spanning a range of line absorption strengths (i.e., the product off-value and wavelength, fλ) of over a factor 4000. Included in the list of lines seen in the spectrum of β1 Sco are 4s 6D9/2-y 4F07/2 λ1611.2 (Wλ = 12.8±1.1 mÅ) and the first known interstellar detection of the weak transition 4s 6D9/2-Z 6F07/2 λ2367.6 (Wλ = 2.0±0.3 mÅ). The new f-values, which carry absolute 1 σ uncertainties of 7%-18%, are referenced to the results obtained from a detailed analysis of the moderately weak transitions 4s 6D912-z 4D0712 2249.9 and 4s 6D9/2-Z 4F09/2 λ2260.8 using the recent well-measured (±8%) laboratory f-values of Bergeson, Mullman, & Lawler (1994). For the ultraviolet transitions studied here, the large range of absorption strengths provides the opportunity for self-consistent analyses of ISM Fe II abundances over a large dynamic range (e.g., between different sight lines sampling a large range of column densities or in single sight lines with multiple and widely varying component structure). For example, application of these new f-values to the Fe II transitions observed toward β1 Sco enables us to trace variations of the column density of Fe II with velocity to a sensitivity of better than 1 part in 10,000.

Affiliated with

Also associated with

No associations

Rating

Atomic Physics with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. II. Oscillator Strengths for Singly Ionized Iron does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Atomic Physics with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. II. Oscillator Strengths for Singly Ionized Iron, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Atomic Physics with the Goddard High-Resolution Spectrograph on the Hubble Space Telescope. II. Oscillator Strengths for Singly Ionized Iron will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1352838