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The Double Dust Envelopes of R Coronae Borealis Stars
Evans, A.; Clayton, Geoffrey C.; Matsuura, M. +5 more
The study of extended, cold dust envelopes surrounding R Coronae Borealis (RCB) stars began with their discovery by the Infrared Astronomical Satellite. RCB stars are carbon-rich supergiants characterized by their extreme hydrogen deficiency and their irregular and spectacular declines in brightness (up to 9 mag). We have analyzed new and archival…
A Correction for IUE UV Flux Distributions from Comparisons with CALSPEC
Bianchi, Luciana; Bohlin, Ralph C.
A collection of spectral energy distributions (SEDs) is available in the Hubble Space Telescope (HST) CALSPEC database that is based on calculated model atmospheres for pure hydrogen white dwarfs (WDs). A much larger set (∼100,000) of UV SEDs covering the range (1150-3350 Å) with somewhat lower quality are available in the IUE database. IUE low-di…