A YSO-like pulsed astrophysical jet and bipolar nebula in a dying star: WFPC2/STIS study of He2-90

Details A YSO-like pulsed astrophysical jet and bipolar nebula in a dying star: WFPC2/STIS study of He2-90 A YSO-like pulsed astrophysical jet and bipolar nebula in a dying star: WFPC2/STIS study of He2-90

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9102s&link_type=abstract

HST Proposal ID #9102

Computer Science

Hst Proposal Id #9102 Ism And Circumstellar Matter

Scientific paper

We have discovered an extended, highly-collimated, bipolar jet in He2-90, an object long classified as a planetary nebula {PN}. The discovery images {obtained with WFPC2/HST} show that the morphology of He2-90 does not look like that of any known PN, but resembles that of a classical young stellar object {YSO}. This appears to be a unique object. We will determine the speed of the jet {only slightly inclined to the sky plane} through proper motion observations of the knots in the jet: a 2nd-epoch WFPC2 H-alphapha image will be obtained for comparison with the Sep99 discovery image. It is crucial to observe the velocity field of the flow at the highest spatial- resolution, as close as possible to the origin of the jet in order to constrain theories for how the jet is driven, and the nature of the central object. We propose to do this by mapping the jet near the central source using the long-slit, medium resolution mode of STIS. We also propose supplemental observations: low resolution STIS spectra for obtaining nebular diagnostics, coupled with narrow-band imaging with WFPC2 in emission lines such as NII, OI and OIII and continuum filters for mapping excitation variations in the nebula and jet and the extinction in the central dense dusty disk region. Coordinated Chandra X-ray observations {with ACIS-I} will be made to check the association of an EGRET > mma-ray source which lies in the direction of He2-90.

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