ar X iv : a st ro - p h / 01 06 34 0 v 1 1 9 Ju n 20 01 1 UPPER LIMITS OF THE 22 NA YIELD FROM O - NE NOVA
نویسندگان
چکیده
The radioactive isotope 22 Na is one of the primary tracer isotopes that may potentially be detectable by gamma-ray spectroscopy. This isotope is predicted to be produced in ONe nova explosions, yet no detection of its 1.275 MeV gamma-ray signature has been reported so far. In particular, 6 years of COMPTEL observations of the galactic bulge, a region that should be particularly rich in nova explosions , have only led to an upper-limit. In this paper we will present the implications of the COMP-TEL upper flux limit on the permissible 22 Na yield for ONe novae. We base our analysis on extensive Monte-Carlo simulations of galactic 1.275 MeV emission that were constrained by the most recent results of galactic nova rates and distributions. We demonstrate that the non-detection of the 1.275 MeV line from the galactic bulge implies a solid upper 22 Na yield limit in agreement with current theoretical nu-cleosynthesis calculations.
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