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Kappa1 Apodis

Star in the constellation Apus From Wikipedia, the free encyclopedia

Kappa1 Apodis
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Kappa1 Apodis is a binary star[4] system in the southern circumpolar constellation of Apus.[1] Its idetifier is a Bayer designation that is Latinized from κ1 Apodis, and abbreviated Kap1 Aps or κ1 Aps, respectively. Based upon parallax measurements, it is located roughly 1,060 light-years (325 parsecs) from Earth. The combined apparent visual magnitude of the system is 5.52,[3] indicating that this is a faint, naked eye star that can be viewed in dark suburban skies. It is moving away from the Sun with a radial velocity of +62 km/s.[7]

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A light curve for Kappa1 Apodis, plotted from TESS data[12]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

This is a spectroscopic binary system, made up of a Be star and a subdwarf O star, which complete an orbit around each other every 192 days.[8] The combined spectrum matches a stellar classification of B1npe.[4] The 'e' suffix indicates that this is a Be star with emission lines in the spectrum. An 'n' means that the absorption lines in the spectrum are broadened from the Doppler effect as a result of rapid rotation. Finally, the 'p' shows some peculiarity in the spectrum. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +5.43 to +5.61.

This is a runaway star with a peculiar velocity of 69.8±4.7 km/s.[10] Because it is a binary star system, it was most likely not turned into a runaway system as the result of a supernova explosion.[4]

A 12th-magnitude orange K-type subgiant[13] located at an angular separation of 27 arcseconds has a much smaller parallax than Kappa1 Apodis and is a distant background object.[14]

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