Highly collimated strings in the nebula around Eta Carinae - a new phenomenon

Details Highly collimated strings in the nebula around Eta Carinae - a new phenomenon Highly collimated strings in the nebula around Eta Carinae - a new phenomenon

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8155w&link_type=abstract

HST Proposal ID #8155

Mathematics

Logic

Hst Proposal Id #8155 Stellar Ejecta

Scientific paper

We propose to observe a set of highly collimated strings in the nebula around Eta Car with the HST/STIS in order to determine their physical nature and their relation to phenomenologically similar structures in nebulae around evolved low mass stars. Eta Car is one of the most massive stars known and a member of the class of Luminous Blue Variables. After hydrogen core burning, these stars enter a shortlived phase which is characterized by strong mass loss, part of which happens in the form of bursts. One of these bursts gave rise to the Homunculus nebula around Eta Car. The strings are faint, almost straight features outside the Homunculus. They are characterized by a linear velocity increase towards larger distances from the star. Only STIS spectroscopy will give us the required spatial resolution to investigate the ionization mechanism, the density structure, the ionizing field and the shock parameters in the strings and their changes along the strings. This will then allow us to determine the physical nature of the strings. Moreover, as there are morpologically similar features in Planetary Nebulae, the so-called FLIERS, it is of importance to investigate the relation between the strings in a nebula around an evolved high mass star and the FLIERS in a nebula around an evolved low mass star in order to understand the mass loss mechanism of the different stellar types better. We request 4 orbits to carry out these observations.

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