Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.318.1086e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 4, pp. 1086-1092.
Astronomy and Astrophysics
Astronomy
13
Circumstellar Matter, Stars: Individual: Nova Cassiopeiae 1993, Stars: Individual: V705 Cas, Novae, Cataclysmic Variables, Radio Continuum: Stars
Scientific paper
We have detected radio emission from the remnant of V705 Cas, beginning 221d after visual maximum. We follow the remnant from first detection while still optically thick through the turn-over to optically thin emission, and finally confirming the absence of emission due to expansion and fading by the end of 1998. While the emission is consistent with thermal bremsstrahlung, as seen in most previous novae, the small-scale structure shows two ridge-like features, which develop significantly from day 585 until our last detection on day 1544. While the development is fairly rapid, it is also much smoother than that seen in V1974 Cyg, in that we can follow individual features as they change over almost 1000d. Our optical spectra unequivocally indicate some form of axial symmetry, as derived from the velocity structure. This is difficult to reconcile with the observed development in the radio images. We suggest a number of possible explanations.
Bode Michael F.
Davis Raymond Jr.
Eyres Stewart P. S.
O'Brien Jennifer Therese
Watson Susan K.
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