Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92.1125l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Nov. 1986, p. 1125-1129.
Astronomy and Astrophysics
Astronomy
4
Cosmic Dust, Interstellar Matter, Reflection Nebulae, Grains, Infrared Astronomy Satellite, O Stars, Optical Thickness, Supergiant Stars
Scientific paper
CCD frames of reflected starlight in the blue continuum, λ 4693, associated with the Trifid emission nebulae have been used to deduce the optical depth, albedo, and phase function of the dust grains. The northern component of the Trifid, centered on the supergiant HD 164514, apparently has grains of higher albedo than those associated with the southern O star HD 164492A. IRAS data add further arguments to the assumption that the northern reflection nebula is illuminated by the supergiant and that the dust grains surrounding the O star have a higher grain temperature. The entire complex is probably part of the Sgr OB I association and the short lifetime of the association puts constraints on the manner in which the properties of the grains can be modified by associated young stars.
Lynds Beverly T.
Oneil Earl J. Jr.
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