Free-Free Turnover in Nova V4743 Sgr 2002 #3

Details Free-Free Turnover in Nova V4743 Sgr 2002 #3 Free-Free Turnover in Nova V4743 Sgr 2002 #3

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4003l&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #40.03; Bulletin of the American Astronomical Society, Vol. 34, p.1161

Astronomy and Astrophysics

Astronomy

5

Scientific paper

We present 1-20 micron spectral energy distributions (SEDs) of the recent bright nova V4743 Sgr (Nova Sgr 2002 #3) obtained 22-26 September 2002 at the 1.52-m Mt. Lemmon Observing Facility with the U of MN Bolometer. On 22 September UT, we observed a turnover in the SED at the narrowband 7.91 micron filter. In λ *Fλ vs. lambda space, the SED is consistent with that of free-free emission (index = -1) shortward of 7.91 micron and with optically thick emission (index = -3) longward of 7.91 micron in the Rayleigh-Jeans limit. Subsequent observations show a more flat SED indicating optically thin emission throughout our spectral coverage and implying the transition point has moved further into the infrared as the ejecta expanded. We acknowledge support from NASA and the U.S. Air Force.

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