Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..381m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 381-394.
Astronomy and Astrophysics
Astronomy
14
Astronomical Polarimetry, Infrared Imagery, Protostars, Reflection Nebulae, Star Formation, Cosmic Dust, Infrared Astronomy, Light Scattering, Near Infrared Radiation
Scientific paper
The paper presents sensitive polarimetric images at J, H, and K of the faint reflection nebulosity in the low-mass young stellar object B5 IRS1. Multiepoch photometry, compared with existing data, shows that the near-IR luminosity of B5 IRS1 has varied significantly between 1983 and 1990, declining steadily in near-IR brightness while maintaining virtually constant near-IR colors. This may suggest an increase of neutral extinction by grains which are growing in a circumstellar disk, which is speculated to have later accreted into planetesimals. The nebula is composed of light scattered in a thin, limb-brightened dust shell partly surrounding the blueshifted lobe of the molecular outflow from IRS1. An estimate of the density in the scattering dust shell indicates rough pressure equilibrium between the shell and the molecular flow, and a sound-crossing time in the shell close to the dynamical age of the flow.
Emerson James P.
Moore Justin Tatch
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