Ultraviolet Transitions of Low Condensation Temperature Heavy Elements and New Data for Interstellar Arsenic, Selenium, Tellurium, and Lead

Oscillator strengths for AsI-III

“…There is no experimental data available for any of the transitions considered, but there is some theoretical data available. For the 4p − 5s transition, the present value, 0.3547, is in good agreement with the theoretical value 0.32 (Cardelli et al 1993), and is comparable to the theoretical values 0.292 (Warner & Kirkpatrick 1969), 0.26 (Bieron et al 1991), and 0.23 (Brage & Leckrone 1995). For the 4p − 4d( 3 D • 1 ) transition, the present value, 1.5497, is in good agreement with the theoretical value 1.4 (Brage & Leckrone 1995).…”

“…The first detection of As ii in the interstellar medium was made by the Goddard High Resolution Spectrograph (Cardelli et al 1993).…”

Photoionization of the3s23p43Pand the3s2Barthel1, Flesch2, Rühl3 et al. 2015Phys. Rev. A201200View full textAdd to dashboardCite

“…In astrophysics, abundance calculations are based on available atomic data that often are insufficient to make definite identifications of spectroscopic lines [1]. In planetary nebulae, the known emission lines are used to identify a characteristic element resulting from the process of nucleosynthesis in stars [2,3].…”

The Abundances of Light Neutron-Capture Elements in Planetary Nebulae

“…It was not until 1994 that n-capture elements were identified in the spectrum of a PN (Péquignot & Baluteau 1994). This led Dinerstein (2001) to the realization that 2 N. C. Sterling & H. L. Dinerstein two anonymous features seen in the K band spectra of PNe are in fact fine-structure transitions of the n-capture elements Kr (Z=36) and Se (Z=34 Cardelli et al 1993), they are useful tracers of s-process enrichments and TDU in PN progenitors. In spite of their small cosmic abundances (∼ 2 × 10 −9 relative to H), we have found that Se and Kr are detectable in a large fraction of PNe, and our survey has increased the number of PNe with known n-capture element abundances by more than a factor of ten.…”