Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..305k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 305-309, 311, 313 (9 ff.).
Astronomy and Astrophysics
Astrophysics
19
Accretion Disks, Astronomical Spectroscopy, Balmer Series, Dwarf Novae, Emission Spectra, Stellar Spectrophotometry, Andromeda Constellation, Binary Stars, Late Stars, Radial Velocity, White Dwarf Stars
Scientific paper
The time-resolved spectroscopy of RX And is presented over six consecutive nights from quiescence and into eruption. The radial velocity curve seen in quiescence was highly distorted, as reported earlier. However, this distortion does not appear to be the result of an s-wave, because it persists even when the line core is excluded from the profile fit. Also, it is seen in the outburst absorption lines, indicating that the source of the distortion extends over the entire visible disk. The accretion disk may have started changing at least 14 hr prior to the start of the optical outburst as seen in the emission-line widths and strengths. After the outburst began, the optically thin regions of the disk became totally ionized and all normal Balmer disk emission was replaced by line emission from two new locations: possibly a shell or the heated face of the secondary star and the L3 point. An expansion of the disk is implied in order to force the gas over the L3 potential barrier. Such a disk expansion is consistent with the predictions of the thermal disk instability theory of dwarf nova eruptions.
Hantzios Panayiotis A.
Kaitchuck Ronald H.
Mansperger Cathy Sue
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