C. H. Chen and M. Jura 2003 ApJ 582 443 doi:10.1086/344589
The Low-Velocity Wind from the Circumstellar Matter around the B9 V Star σ Herculis
FREEC. H. Chen1 and M. Jura1
Show affiliationsWe have obtained Far Ultraviolet Spectroscopic Explorer spectra of σ Her, a nearby binary system with a main-sequence primary that has a Vega-like infrared excess. We observe absorption in the excited fine structure lines C II* at 1037 Å, N II* at 1085 Å, and N II** at 1086 Å that are blueshifted by as much as ~30 km s-1 with respect to the star. Since these features are considerably narrower than the stellar lines and broader than interstellar features, the C II and N II are circumstellar. We suggest that there is a radiatively driven wind arising from the circumstellar matter rather than accretion as occurs around β Pic because of σ Her's high luminosity. Assuming that the gas is liberated by collisions between parent bodies at 20 AU, the approximate distance at which blackbody grains are in radiative equilibrium with the star and at which three-body orbits become unstable, we infer dM/dt ~ 6 × 10-12 M
yr-1. This wind depletes the minimum mass of parent bodies in less than the estimated age of the system.
- Subject headings
circumstellar matter; planetary systems: formation; stars: individual (σ Herculis)
- Dates
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Issue 1 (2003 January 1)
Received 2002 April 23, accepted for publication 2002 September 5
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The Low-Velocity Wind from the Circumstellar Matter around the B9 V Star σ Herculis
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