| タイトル | Rapid oscillations in cataclysmic variables. VIII - YY Draconis (=3A 1148 + 719) |
| 著者（英） | Schwartz, D. A.; Pye, J. P.; Patterson, J.; Blair, W. P.; Caillault, J.-P.; Williams, G. A. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1992-06-10 |
| 言語 | eng |
| 内容記述 | A 16th magnitude cataclysmic variable presumably a dwarf nova, was detected near one of the positions permitted for the hard (2-10 keV) X-ray source 3A 1148 + 719. The optical and UV spectra of YY Dra are fairly typical of cataclysmic variables, except that the TiO absorption bands of an M dwarf can be seen for greater than 5000 A. This shows that the accretion disk is intrinsically faint in quiescence, suggesting a very low accretion rate. Yet the fairly blue continuum slope in the vacuum UV indicates the presence of a small hot object, presumably the white dwarf. The radial velocities at H-alpha indicate a 4.0-hr orbital period, and the IR light curve appears to show the expected 'double-humped' waveform from the distorted secondary. High-speed photometry in the U band reveals a stable periodicity of about 1-percent semiamplitude at a period of 275 s, with some power also in the subharmonic at about 550 s. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 92A42424 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/326465 |
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