Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.2107h&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #21.07; Bulletin of the American Astronomical Society, Vol. 26, p.1344
Other
1
Scientific paper
Spectrally-resolved eclipse maps of the accretion disk in the dwarf nova IP Peg are presented and discussed. The analysis is based on time-resolved optical spectroscopic observations covering one eclipse during the 1993 May outburst. The trailed spectrogram was divided into passbands ( ~ 50 Angstroms in the continuum and ~ 600 Km/s in the emission lines) and light curves were extracted for each one. Velocity-resolved light curves in Hα show minima progressively displaced towards later phases as one moves from blue to red, signaling a rotational disturbance in this emission line. Eclipse mapping techniques were used to solve for a map of the disk brightness distribution and for the flux of an additional uneclipsed component in each band. In contrast to other dwarf novae in outburst, the radial temperature profiles derived from these maps are in clear disagreement with the radial dependence predicted by the steady state disk model (T ~ R(-3/4) ). The flat profiles obtained are quite similar to those observed in quiescent dwarf novae, with temperatures ranging from 4,000K to 6,500K. Spatially-resolved disk spectra show that the Hα and the HeI lambda 5876 and lambda 6678 lines are in emission at all disk radii. This is in marked contrast with the results obtained for the nova-like variable UX UMa, where the lines progressively transition from absorption in the inner disk to emission in the outer disk (Rutten et al. 1994; Baptista et al. 1994). This result suggests that the currently accepted view that nova-like systems are similar to dwarf novae in a permanent outburst state has to be revised.
Baptista Raymundo
Haswell Carole A.
Thomas GS
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