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- Q17042323 subject Q5894358.
- Q17042323 subject Q7009369.
- Q17042323 subject Q8346772.
- Q17042323 subject Q8691170.
- Q17042323 abstract "RZ Gruis is a nova-like binary system in the constellation Grus composed of a white dwarf and an F-type main sequence star. It is generally of apparent magnitude of 12.3 with occasional dimming to 13.4. Its components are thought to orbit each other roughly every 8.5 to 10 hours (much longer than most nova-like variables, which have periods of around 3 to 4 hours). It belongs to the UX Ursae Majoris subgroup of cataclysmic variable star systems, where material from the donor star is drawn to the white dwarf where it forms an accretion disc that remains bright and outshines the two component stars. The system is around 1,434 light-years away from Earth.Originally named and discovered to be variable in 1949, RZ Gruis was discovered to be a cataclysmic variable after its spectrum was investigated in 1980. Considered initially to be a hot blue B-type star, it was found to have Balmer spectral lines of the hydrogen atom. If it were indeed a B-type main sequence star (and hence lie at a remote 35000 light-years distance), it would lie well out of the galactic plane. The investigators proposed that the emission lines have arisen from an accretion disc around a white dwarf rather than from the star itself. The system is poorly known, though the donor star has been calculated to be of spectral type F5V. These stars have spectra very similar to novae that have returned to quiescence after outbursts, yet they have not been observed to have erupted themselves. The American Association of Variable Star Observers recommends watching this class of star for future events such as possible nova eruptions.".
- Q17042323 wikiPageWikiLink Q10563.
- Q17042323 wikiPageWikiLink Q1059564.
- Q17042323 wikiPageWikiLink Q1205564.
- Q17042323 wikiPageWikiLink Q179600.
- Q17042323 wikiPageWikiLink Q3239165.
- Q17042323 wikiPageWikiLink Q5894358.
- Q17042323 wikiPageWikiLink Q6458.
- Q17042323 wikiPageWikiLink Q653711.
- Q17042323 wikiPageWikiLink Q7009369.
- Q17042323 wikiPageWikiLink Q8346772.
- Q17042323 wikiPageWikiLink Q8691170.
- Q17042323 wikiPageWikiLink Q8928.
- Q17042323 comment "RZ Gruis is a nova-like binary system in the constellation Grus composed of a white dwarf and an F-type main sequence star. It is generally of apparent magnitude of 12.3 with occasional dimming to 13.4. Its components are thought to orbit each other roughly every 8.5 to 10 hours (much longer than most nova-like variables, which have periods of around 3 to 4 hours).".
- Q17042323 label "RZ Gruis".