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Rho Aquarii
Star in the constellation Aquarius From Wikipedia, the free encyclopedia
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Rho Aquarii is a binary star[10] system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from ρ Aquarii, and abbreviated Rho Aqr or ρ Aqr. This system is visible to the naked eye as a point of light with an apparent visual magnitude of +5.34.[3] Based upon parallax measurements, this star is located at a distance of approximately 750 light-years (230 parsecs) from the Sun.[2] It is drifting closer with a radial velocity of –9 km/s.[5] The position of this star near the ecliptic means it is subject to lunar occultations.[11]
This is a single-lined spectroscopic binary, with the presence of a companion being revealed by Doppler shifts in the spectrum.[10] An initial orbital solution for the data gives a period of 220.4 days with a circular orbit.[6]
The primary is a non-magnetic chemically peculiar star with a stellar classification of B8 IIIp Mn:Hg:.[4] It is a candidate mercury-manganese star, showing a surfeit of these elements in the spectrum.[10] At least two pulsation periods have been detected; the first is characteristic of a Delta Scuti variable and the second of a Gamma Doradus variable, suggesting this is a hybrid pulsator.[7] The dominant pulsation period is 1.1203±0.0002 d.[12] With 4.63 times the Sun's mass, this star is radiating 1,023 times as much luminosity from its outer atmosphere at an effective temperature of 12,454 K.[7] This heat gives it the blue-white hue of a B-type star.[13] It is spinning with a rotation period of 6.5633±0.0063 d.[7] The primary does not display photometric variability, but the companion may be a variable star.[14] Although no specific age estimates have been published for this star, it is likely to be less than 50 million years old.[15]
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