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Fluorine in R Coronae Borealis and Extreme Helium Stars
Gajendra Pandey, David L. Lambert, N. Kameswara Rao
Neutral fluorine lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine…
Considerations for an Ac Dipole for the LHC
M. Bai, R. Calaga, W. Fischer +7
Following successful experience at the BNL AGS, FNAL Tevatron, and CERN SPS, an AC Dipole will be adopted at the LHC for rapid measurements of ring optics. This paper describes som…
Spectral Properties From Lyman-alpha to H-alpha For An Essentially Complete Sample of Quasars I: Data
Zhaohui Shang, Beverley J. Wills, D. Wills +1
We have obtained quasi-simultaneous ultraviolet-optical spectra for 22 out of 23 quasars in the complete PG-X-ray sample with redshift, z<0.4, and M_B<-23. The spectra cover rest-f…