HEAD Division Meeting 1999, April 1999
Session 36. SNRs and Isolated NS
Oral, Thursday, April 15, 1999, 8:30am-10:01am, Colonial Room

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[36.04] The Progenitor of the New Vela SNR GRO J0852-4642

W. Chen (UMD/GSFC), N. Gehrels (NASA/GSFC)

We show that (1) the newly discovered supernova remnant in Vela, GRO J0852-4642/RX J0852.0-4622, was probably created by a core-collapse supernova of a 15 solar-mass star about 700 yrs ago at a distance of ~50 pc, and (2) the same supernova which produced the 44Ti detected by COMPTEL from this source may also be responsible for the 26Al emission in the same direction observed by COMPTEL. Our analysis favors a large current SNR shell expansion speed of more than 3,000 km s-1, more than a factor of 2 greater than that naively derived from the X-ray data. A combination of our source parameter estimates and the positional coincidence of the new SNR with the centroid of the COMPTEL 26Al emission feature of the Vela region argues strongly for a causal connection. We also discuss some other significant theoretical implications.

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