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A Far Ultraviolet Study of the Old Nova V841 Oph | | Scott G. Engle
; Edward M. Sion
; | | Date: |
19 Sep 2005 | | Subject: | astro-ph | | Abstract: | We have carried out a synthetic spectral analysis of archival IUE spectra of the old nova V841 Oph (Nova Oph 1848) taken 15 years apart. The spectra reveal a rising continuum shortward of 1560AA, a C {sc iv} P-Cygni profile indicative of wind outflow associated with disk accretion in one spectrum, a deep Ly $alpha$ profile, and strong N {sc v} (1238AA, 1242AA) and O {sc v} (1371AA) wind/coronal absorption lines. Numerous sharp interstellar resonance lines are also present. A grid of high gravity atmospheres and accretion disk models, spanning a wide range of inclinations, accretion rates and white dwarf masses was compared to the de-reddened spectra. We find that, for a steady state accretion disk model to account for the FUV spectra, the accretion rate is only $sim$3 $ imes$ 10$^{-11}$ M$_{sun}$/yr, 147 years after its outburst in 1848, with an implied distance within $sim$300 pc. The accretion rate at 147 years post-outburst is smaller than expected for an old nova. | | Source: | arXiv, astro-ph/0509544 | | Services: | Forum | Review | PDF | Favorites | |
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