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1998ApJ...505..897J - Astrophys. J., 505, 897-902 (1998/October-1)
A protocometary cloud around HR 4796A?.
JURA M., MALKAN M., WHITE R., TELESCO C., PINA R. and FISHER R.S.
Abstract (from CDS):
The Hipparcos data can be used to argue that the three main-sequence A-type stars in the Bright Star Catalogue with LIR/Lbol > 10–3 (HR 4796A, β Pic, and 49 Cet) all have low luminosities for their colors. We argue that approximately 20% of all A-type stars pass through an early phase where they possess an amount of circumstellar dust comparable to that found around HR 4796A or β Pic.
In order to explain the result that the grain emission can be approximated by a 110 K blackbody, we propose that the circumstellar grains are largely composed of ice particles with a typical radius near 100 µm, and that they sublimate rapidly when they are closer than ∼35 AU to HR 4796A. This swarm of ice particles might be a protocometary cloud.
Abstract Copyright: ∼
Journal keyword(s): Stars: Binaries: Visual - Stars: Circumstellar Matter - Stars: Individual: Bright Star Number: HR 4796
CDS comments: HR 4796 A, B = IDS 12307-3919 A, B
Simbad objects: 8
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