Dust in the circumstellar environment of AG Carinae - Evidence for a bipolar and helical structure

Details Dust in the circumstellar environment of AG Carinae - Evidence for a bipolar and helical structure Dust in the circumstellar environment of AG Carinae - Evidence for a bipolar and helical structure

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341l..83p&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 341, June 15, 1989, p. L83-L85.

Astronomy and Astrophysics

Astrophysics

39

Blue Stars, Cosmic Dust, Stellar Envelopes, Stellar Luminosity, Continuous Radiation, Emission Spectra, Spectral Bands, Stellar Winds

Scientific paper

The intermediate surroundings of the Galactic luminous blue variable AG Car have been imaged at 0.8 arcsec resolution through broad-band B, V, R, and I filters with the STScl coronagraph on the ESO 2.2 m telescope. High anisotropic continuum emission in all these bands is clearly detected above sky background at intensity levels in the range m(V) = 17.9-19.4 mag/sq arcsec. Most of the signal is confined to a prominent bipolar structure elongated along the NE-SW direction extending from a few arcsec out to about 15 arcsec corresponding to a projected linear distance of about 0.5 pc from the star. The morphology of the SW extension seems to consist of two, about 1.5 arcsec thick outwardly spiraling helical filaments embedded in the brightest part of the gaseous ring nebula. Its essentially neutral color with respect to the star suggests that the observed radiation is starlight scattered by grains, while the almost constant brightness of the filaments implies a dust column density increasing with distance from the star.

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