Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5608d&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #56.08; Bulletin of the American Astronomical Society, Vol. 26, p.951
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We have completed a kinematic study of the fast-moving, oxygen-rich filaments identified in the Puppis A supernova remnant by Winkler and Kirshner (1985, ApJ, 299, 981). These filaments, which have high oxygen and neon abundances and almost no hydrogen, are probably shards of supernova ejecta that have remained almost undiluted and undecelerated by interaction with the ISM -- similar to the fast-moving knots in Cas A. \ Proper motions of several knots, measured over an 8-year baseline by Winkler et al. (1988, IAU Colloq 101, 65), are typically 0.1 to 0.2 arcsec yr(-1) \ and are consistent with undecelerated expansion from a supernova event 3700 years ago. New spectra of 11 of these filaments, obtained from the CTIO 4-m, give radial velocities from -1600 to +1000 km s(-1) . A model in which all the filaments lie on a uniformly expanding spherical shell is consistent with the data and indicates an expansion velocity of 1870 km s(-1) . Combination of the proper motions and radial velocities yields a kinematic distance to Puppis A of 1.9 kpc, a value consistent with previous values from based on less direct methods. Puppis A now becomes one of the mere handful of remnants with a kinematically determined distance.
Dechristopher B. M.
Winkler Frank P.
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