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- Q9291562 subject Q7009369.
- Q9291562 subject Q7217188.
- Q9291562 subject Q8293947.
- Q9291562 subject Q8694388.
- Q9291562 abstract "Pi1 Gruis is a star in the constellation Grus. It is a semi-regular red giant of spectral type S5, ranging from apparent magnitude 5.31 to 7.01 over a period of 191 days, and is around 532 light-years from Earth. It is one of the brightest stars of a class of stars known as S Stars, and has a companion star of apparent magnitude 10.9 that is sunlike in properties—a yellow main sequence star of spectral type G0V. Separated by 2.71′′, the pair make up a likely binary system. The primary star has a measured diameter of 21 milliarcseconds, corresponding to a diameter 694 times that of the Sun. It is an ageing star, thought be well on its way transitioning from a red giant to a planetary nebula. A shell of material has been detected at a distance of 0.91 light-years (0.28 parsecs), which is estimated to have been ejected 21,000 years ago. Closer to the star, there appears to be a cavity within 200 AU, suggesting a drop off in the ejection of material in the past 90 years. The presence of one companion makes the shape of the shell irregular (rather than spherical), and there may as yet be another undetected companion contributing to this.The star was catalogued by French explorer and astronomer Nicolas Louis de Lacaille in 1756 but not given a name. Instead, he gave the Bayer designation of "Pi Gruis" to Pi2 Gruis. It was Thomas Brisbane who designated this star as Pi1. Annie Jump Cannon was the first to report its unusual spectrum, sending a plate of its spectrograph made in 1895 to Paul W. Merrill and noting its similarity to R Andromedae. Merrill selected these two stars along with R Cygni to be the three prototypes of the S Star class. Pi1 Gruis was one of the first 17 stars defined as S-stars by Merrill in 1922; the only star not observed from Mount Wilson due to its southerly location in the sky. Analysis of its spectrum showed bands indicating the presence of technetium, as well as oxides of zirconium, lanthanum, cerium and yttrium but not titanium nor barium (which have been recorded in other S stars).".
- Q9291562 wikiPageWikiLink Q1038.
- Q9291562 wikiPageWikiLink Q1054.
- Q9291562 wikiPageWikiLink Q1054411.
- Q9291562 wikiPageWikiLink Q105616.
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- Q9291562 wikiPageWikiLink Q13632.
- Q9291562 wikiPageWikiLink Q1385.
- Q9291562 wikiPageWikiLink Q16931344.
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- Q9291562 wikiPageWikiLink Q230650.
- Q9291562 wikiPageWikiLink Q3233606.
- Q9291562 wikiPageWikiLink Q376367.
- Q9291562 wikiPageWikiLink Q499138.
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- Q9291562 wikiPageWikiLink Q523.
- Q9291562 wikiPageWikiLink Q531.
- Q9291562 wikiPageWikiLink Q555846.
- Q9291562 wikiPageWikiLink Q6074790.
- Q9291562 wikiPageWikiLink Q7009369.
- Q9291562 wikiPageWikiLink Q710615.
- Q9291562 wikiPageWikiLink Q716.
- Q9291562 wikiPageWikiLink Q7217188.
- Q9291562 wikiPageWikiLink Q8293947.
- Q9291562 wikiPageWikiLink Q8694388.
- Q9291562 wikiPageWikiLink Q8928.
- Q9291562 wikiPageWikiLink Q941.
- Q9291562 wikiPageWikiLink Q984158.
- Q9291562 type Place.
- Q9291562 type CelestialBody.
- Q9291562 type Location.
- Q9291562 type Place.
- Q9291562 type Star.
- Q9291562 type Thing.
- Q9291562 comment "Pi1 Gruis is a star in the constellation Grus. It is a semi-regular red giant of spectral type S5, ranging from apparent magnitude 5.31 to 7.01 over a period of 191 days, and is around 532 light-years from Earth. It is one of the brightest stars of a class of stars known as S Stars, and has a companion star of apparent magnitude 10.9 that is sunlike in properties—a yellow main sequence star of spectral type G0V. Separated by 2.71′′, the pair make up a likely binary system.".
- Q9291562 label "Pi1 Gruis".
- Q9291562 name "Pi1 Gruis".