Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4906m&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #49.06; Bulletin of the American Astronomical Society, Vol. 34, p.1185
Astronomy and Astrophysics
Astronomy
Scientific paper
During an outburst beginning in 1837, the luminous blue variable η Carinae ejected at least one solar mass of material. That ejected material has been well studied and is highly structured, consisting of an outflowing equatorial ``skirt'' and bipolar lobes (the hourglass-shaped ``homunculus''). Recent proper motion measurements of Morse et al. (2001, ApJ, 548, 207L) suggest that at least some of the material in the skirt has the same dynamical age as the lobes, contrary to the assumptions of interacting winds models for the η Car nebula. In the context of the η Car eruption, and relying on time-dependent, numerical, magnetohydrodynamic simulations, we present a simple stellar wind model that produces an outflowing disk and bipolar lobes in a single wind. The shape of the wind bears a remarkable resemblance to the overall shape of the η Car nebulae. The basic model consists of a pressure-driven wind from a rotating star with an axis-aligned dipole magnetic field. In the wind, the azimuthal component of the magnetic field (generated by the rotation of the dipolar field) compresses the wind toward the equator and also toward the rotation axis, simultaneously producing an outflowing disk and jet. In order to produce wide angle lobes similar to the homunculus (which have roughly a 30o opening angle), a high-speed polar wind from the star is required. We will present both steady-state and time-dependent wind models. This research was supported by NASA grant GO 9050 awarded from STScI, by NSF grant AST-9729096, and by NSERC, McMaster University, and CITA through a CITA National Fellowship.
Balick Bruce
Matt Sean
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