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The Newly Active R Coronae Borealis Star, V2552 Oph
E. Hesselbach, Geoffrey C. Clayton, Paul S. Smith
In 2001, V2552 Oph (CD -22 12017, HadV98) quickly faded by several magnitudes in a manner typical of the R Coronae Borealis (RCB) stars. Photometry of V2552 Oph obtained over 70 ye…
SMC-Type Interstellar Dust in the Milky Way
Lynne A. Valencic, Geoffrey C. Clayton, Karl Gordon +1
It is well known that the sightline toward HD 204827 in the cluster Trumpler 37 shows an UV extinction curve that does not follow CCM. However, when a dust component, foreground to…
Winds in R Coronae Borealis Stars
Geoffrey C. Clayton, T. R. Geballe, Luciana Bianchi
We present new spectroscopic observations of the He I 10830 line in R Coronae Borealis (RCB) stars which provide the first strong evidence that most, if not all, RCB stars have…
A Quantitative Comparison of SMC, LMC, and Milky Way UV to NIR Extinction Curves
Karl D. Gordon, Geoffrey C. Clayton, K. A. Misselt +2
We present an exhaustive, quantitative comparison of all of the known extinction curves in the Small and Large Magellanic Clouds (SMC and LMC) with our understanding of the general…
The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing small molecular PAHs
Geoffrey C. Clayton, Karl D. Gordon, Adolf N. Witt +7
We have obtained new STIS/HST spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a search for absorption features produce…
Dust Grain-Size Distributions From MRN to MEM
Geoffrey C. Clayton, Michael J. Wolff, Ulysses J. Sofia +2
Employing the Maximum Entropy Method algorithm, we fit interstellar extinction measurements which span the wavelength range 0.125-3 micron. We present a uniform set of MEM model fi…