منابع مشابه
A TiO study of the dwarf nova IP Pegasi
We present red spectra in the region ∼ λ7000–8300Å of the eclipsing dwarf nova IP Peg, with simultaneous narrow-band photometry centered at 7322Å. We show that by placing a second star on the slit we can correct for the telluric absorption bands which have hitherto made the TiO features from the secondary star unusable. We use these TiO features to carry out a radial velocity study of the secon...
متن کاملHST/FOS Eclipse mapping of IP Pegasi in outburst
IP Pegasi is a deeply eclipsing dwarf nova (Porb = 3.8 hr) which shows 1-2 weeks-long, ≃ 2 mag outbursts every 60120 days. During outbursts, tidally induced spiral shocks form in its accretion disc as the disc expands and its outer parts feel more effectively the gravitational attraction of the companion star (Steeghs, Harlaftis & Horne 1997). Here we present the first results of a time-resolve...
متن کاملSpiral Structure in Ip Pegasi; How Persistent Is It?
Figure 4. Trailed spectrograms (top panels), Doppler maps (middle panels) and computed data (bottom panels) are plotted for Hβ, He ii λ4686Å, and He i λ4472Å for both nights. The computed data were reconstructed from the Doppler maps. The letters A, B and C mark flares visible in both Hβ and He ii λ4686Å; these lead to some artifacts (diagonal stripes) in the maps. ABSTRACT We present spectrosc...
متن کاملSpiral structure in the accretion disc of the binary IP Pegasi
We have found the first convincing evidence for spiral structure in the accretion disc of a close binary. The eclipsing dwarf nova binary IP Peg, observed during the end phase of a rise to outburst, shows strong Balmer and Helium emission lines in its spectra, with asymmetric double peaked velocity profiles produced in the accretion disc around the white dwarf. To reveal the two armed spiral on...
متن کاملHST/FOS Time-resolved spectral mapping of IP Pegasi at the end of an outburst
We report an eclipse mapping analysis of time-resolved ultraviolet spectroscopy covering three eclipses of the dwarf nova IP Pegasi on the late decline of the 1993 May outburst. The eclipse maps of the first run show evidence of one spiral arm, suggesting that spiral structures may still be present in the accretion disc 9 days after the onset of the outburst. In the spatially resolved spectra t...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1987
ISSN: 0252-9211
DOI: 10.1017/s0252921100104786