Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..689b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 689-695.
Astronomy and Astrophysics
Astrophysics
16
Absorption Spectra, Cosmic Dust, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Ultraviolet Absorption, Variable Stars, Interstellar Extinction, Iue, Particle Density (Concentration), Polarization Characteristics, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
IUE observations of the 2200 A absorption feature of circumstellar dust were made of the three RV Tauri stars AC Her, U Mon, and R Sct. U Mon was found to have a dust shell with a much lower column density at 2200 A than R Sct and possibly AC Her, requiring U Mon to have a much more extended dust shell than R Sct to account for its greater infrared excess. AC Her and R Sct were observed twice, at different phases of their cycles, and no major change in the 2200 A absorption feature with phase was detected. Such a change would have supported the idea that the slight polarization of these stars' visual light is caused by the circumstellar dust.
Baird Scott R.
Cardelli Jason A.
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