Follow Us| VW Hyi | ||||||||||||||||||
| The FUSE spectrum of the DN VW Hyi is shown in quiescence with a single WD model. We ignore a possible second component (see the analysis in Long et al. 2007, 2009). The effect of the the Hydrogen quasimolecular opacity is included in the modeling and they way it affects the spectrum is indicated with arrows (the dotted/dashed line shows a model without its inclusion). The spectrum has been dereddened assuming the published value E(B-V)=0.01. There are many more FUSE exposures available in the MAST archive, however, the FUSE spectrum here was processed and modeled in Godon et al. (2008). The additional FUSE spectra of VW Hyi were analyzed in Long et al. (2007, 2009). Towards the shorter wavelengths as well as in the Lyman beta region the flux does not go to zero. It could be due to a second emitting component (emitting a continuum flux). This second component is observed only during the early stages after outburst. | |||||||||||||||||
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FUSE Data
Synthetic Spectrum
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These data and models were published in the paper: Godon, P., Sion, E.M., Barrett, P.E., Hubeny, I., Linnell, A.P., Szkody, P. 2008, ApJ, 679, 1447 | ||||||||||||||||||||||||||||||||||||
Notes on figures:The flux (vertical axis) is given in ergs/sec/cm2/A and the wavelength (horizontal axis) is given in Angstroem. For clarity the spectrum is shown on 3 panels: the upper panel from about 900 to 1000A, the middle panel from about 1000A to 1100A, and the lower panel from about 1100A to 1200A. Air glow emission is anoted above each panel with a "+" sign inside a circle. Strong emission lines reaching the upper part of the frame in each pael is marked just above the panel. The Hydrogen series is marked below the x-axis in the upper and middle panel and the hydrogen cut-off limit is clearly marked around 915A with an increasing density of tick marks. The He I (1168A) is marked below the lower panel. Oxygen I lines are shown with an arrow "OI -->" if many (ISM) OI lines are present, they are just annotated with verical tick marks in the lower portion of each panel. ISM molecular hydrogen lines are either individually annotated vertically (e.g. L10R1) or just marked with an arrow "MH -->" and vertical tick marks (usually in the upper part of each panel). Features resulting from fixed pattern noise introduced by FUSE detect ors are indicated with "FPN;.When a model is shown, the portions of the observed spectrum that have been masked before the spectral fit are in blue, while the rest of the observed spectrum is in red. The model fit is shown the solide line in black (or possibly white). If the model is a composite made of a disk model and a white dwarf model, then these are shown with the dashed- and dotted lines (respectively). Some models include the effect of quasi-molecular HI absorption features, these are labelled "Q-mol" in the spectrum. |
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