Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..194o&link_type=abstract
Astronomy and Astrophysics, v.347, p.194-202 (1999)
Astronomy and Astrophysics
Astrophysics
18
Stars: Circumstellar Matter, Stars: Individual: Hd 101584, Stars: Mass-Loss, Stars: Agb And Post-Agb, Radio Lines: Stars
Scientific paper
CO radio line observations reveal a molecular gas envelope around the peculiar star HD101584 with characteristics very similar to those of wellknown young post-AGB objects. We estimate that there is at least 0.1 M_sun of molecular gas, very likely remnant gas from a former AGB-envelope. This gas has been efficiently accelerated to very high velocities (>50 {km s(-1) , and a significant fraction to >100 {km s(-1) ). There is evidence for an expanding disk-like structure seen close to edge-on, and a high-velocity bipolar outflow. In the latter the expansion velocity increases linearly with distance from the star, suggesting either a brief period of ejection or a fast wind interacting with a slower wind. A significant fraction of the high-velocity gas has reached a welldefined terminal velocity. Momentum well above the available radiation momentum has been transferred to the gas. There are also indications of high-density, low-velocity molecular gas, possibly in a disk close to the star. The (12) CO/(13) CO-ratio in the envelope is uncertain, but probably quite low ( ~ 10). The systemic heliocentric velocity is 50+/-2 {km s(-1) .
Nyman L.-AA.
Olofsson Hans
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