Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..87c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. L87-L90.
Astronomy and Astrophysics
Astronomy
10
A Stars, Interstellar Matter, Shell Stars, Stellar Envelopes, Ultraviolet Radiation, Color-Color Diagram, Cosmic Dust, Emission Spectra, Infrared Astronomy Satellite, Iue
Scientific paper
Archival IRAS data and recent IUE observations of the A shell star HR 10 (HD 256) are presented. HR 10 is detected in the IRAS Faint Source Survey and ADDSCAN data at 12 and 25 microns and marginally detected at 60 microns. The IUE data indicate a spectral type of A2 with 0.1 mag of UV selective extinction following a galactic average extinction law. HR 10 shows an infrared excess, compared to normal A stars of the same spectral type, beginning at 12 microns and extending to longer wavelengths. The IR excess is consistent with free-free emission and a suggestion of CS dust. The IR colors for this star differ significantly from those of Beta Pic and are closer to those of Vega. The absence of circumstellar selective extinction shortward of 3200 A suggests that the circumstellar grain size distribution does not resemble that of the interstellar medium, but may be more like the grains around Vega and Beta Pic.
Bruhweiler Frederick C.
Cheng Kwang-Ping
Grady Carol A.
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