OSSE Observations of Nova Velorum 1999
J.E. Grove, R.A. Kroeger & J.D. Kurfess
Gamma-ray line emission has long been predicted from
classical novae, but never detected.
Nova Velorum 1999 reached 3rd magnitude in May and is
probably closer than 2 kpc, making it CGRO's best candidate
yet for detecting line emission from 7Be (478 keV)
and 22Na (1275 keV). CGRO OSSE observed N Vel 1999
for 26 days beginning on 27 May 1999 (5 days after optical
Preliminary analysis reveals no evidence for for either
478 or 1275 keV line emission, with 99% upper limits
of 5.6 10-5 and 8.1 10-5 cm-2 s-1,
respectively. We do see a significant hard X-ray continuum,
but can not unambiguously associate it with the classical
nova. Efforts to understand this emission continue. Here
we will report the progress of this work and the implications
of the line limits.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.