V458 Vul 2007: A Fast Varying Nova In The Early Phase Of Evolution

Details V458 Vul 2007: A Fast Varying Nova In The Early Phase Of Evolution V458 Vul 2007: A Fast Varying Nova In The Early Phase Of Evolution

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943616r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #436.16

Astronomy and Astrophysics

Astronomy

Scientific paper

We spatially resolved 2.2 $\mu$m emission from the classical nova V458 Vul 2007 using Palomar Testbed Interferometer (PTI) immediately following its discovery on 2007 August 8.54 UT. Simultaneously, we obtained a high resolution spectra of the nova during its early days of explosion. We used several simple morphologies to model the nova's ejecta. Our analysis shows that the emission from the nova can be modeled as a disk at low ellipticity which is consistent to the nova being in the fireball phase at which the outflowing gas is optically thick, confirmed by the presence of strong P-Cygni Balmer lines in the spectra. Combining the expansion velocity derived by H$\alpha$ line with the nova's angular expansion rate measured with interferometry, the distance to the nova is computed. The computed distance is 9.9 -11.1 kpc. The spectra of the nova unveils the quick transition of the system from Fe II to He/N which makes V458 Vul 2007 a hybrid nova.

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