Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..646b&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Multifrequency spatially-resolved radio continuum observations of the M supergiants Alpha Ori (M2 Iab) and Alpha Sco (M1 Iab + B2.5 V) obtained using the VLA A array and VLA+Pie Town configurations are used to measure changes in the extended (with scale 1 - 10 stellar radii) atmospheres of these stars and to model the conditions in the acceleration regions of their winds. Strong modelling constraints on the atmospheric thermal properties are derived because the radio source is resolved in multiple observing bands. Changes seen in the Alpha Ori source flux density and radio visibility data occurring on months - years timescales are described based on observations obtained in 2002 February and April and in 1996 December. Multicomponent models for the plasma conditions in both the warm and cool gas around Alpha Ori are examined. The radio properties of the Alpha Sco system both of the M supergiant itself and in the H II region surrounding the B-type companion are used to estimate conditions within the M supergiant's wind. These observations are of relevance to understanding the process of mass loss and how chemically-processed material is returned to the interstellar medium.
Brown Adrian
Harper Graham M.
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