Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2570b&link_type=abstract
HST Proposal ID #2570
Physics
Hst Proposal Id #2570
Scientific paper
We propose HST FOC imagery of two unusual central stars of planetary nebulae. V605 Aq1, the central star of Abell 58, appeared as a 10th-mag red giant for several years around 1920, but is now fainter than 20th mag and appears to lie inside a compact knot of very hydrogen-deficient nebulosity. HST UV images can directly establish that the central star is now extremely hot, providing the first direct evidence for thermal pulses that are predicted to occur in hot pre-white-dwarfs. 0950+139, the central star of EGB 6, is presently a hot white dwarf, surrounded by a compact, unresolved nebula. FOC imagery in the [O III] and H-beta emission lines will establish one of the following. (1) The compact nebula remains unresolved from HST, implying ongoing mass loss from the white dwarf, for which there is no physical understanding at present. (2) The nebula shows sub-arcsecond structure (a hollow shell, blobs, or jets). implying a discrete mass-ejection event, most probably associated with a "self-induced nova" outburst in the fairly recent past. The latter would again provide evidence for an event theoretically predicted to occur in some hot white dwarfs. (3) The nebula shows disk-like structure, suggesting that it arises from ablation of a planetary companion.
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