Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347l..35r&link_type=abstract
Astronomy and Astrophysics, v.347, p.L35-L38 (1999)
Astronomy and Astrophysics
Astrophysics
9
Stars: Agb And Post-Agb, Stars: Circumstellar Matter, Stars: Individual: Alpha Ori, Stars: Individual: R Leo, Stars: Late-Type, Infrared: Stars
Scientific paper
CO 4.6 mu m vibration-rotational lines are detected in fluorescent emission from the inner regions of the Betelgeuse (alpha Orionis) and R Leonis stellar winds. The spatially and spectrally resolved 1-0 R(1), R(2), and R(3) line profiles are found to be highly useful probes of circumstellar shells. The current data sample only a few regions of the circumstellar shells of the program stars. However, now it should be possible to obtain envelope maps and absolute flux estimates, allowing new independent estimates of mass loss rates. This will open up new possibilities in the study of the structure and dynamics of stellar winds around red giants. The temperature 4arcsec away from alpha Ori is found to be 38(+6}_{-5} {K) . For R Leo the temperature 4arcsec North is derived to be 24(+3}_{-2} {K) and 4arcsec South 35(+7}_{-4} {K) .
Eriksson Kimmo
Gustafsson Bengt
Hinkle Kenneth H.
Lambert David L.
Olofsson Hans
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