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R Crucis
Variable star in the constellation Crux From Wikipedia, the free encyclopedia
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R Crucis is a variable star in the southern constellation of Crux. It has a yellow-white hue and is often too faint to see with the naked eye, having an apparent visual magnitude that fluctuates around 6.89.[3] This object is located at a distance of approximately 1,600 light years from the Sun based on parallax,[7] but it is drifting closer with a radial velocity of −13.5 km/s.[3]
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This is a Classical Cepheid, or Delta Cephei variable, that ranges in brightness from visual magnitude 6.40 down to 7.23 with a period of 5.82575 days.[6] It is a supergiant star with a stellar classification that varies over each pulsation cycle, giving it a class range of F6-G2Ib-II.[4] The star has a mean radius 44.6 times the radius of the Sun (44.6 R☉), but the radius varies by 5 R☉ during each pulsation.[11] It has a near solar metallicity and the atmospheric abundances indicate it is likely past first dredge-up.[9]
A candidate companion star has been detected at an angular separation of 7.6″, which corresponds to a projected separation of 6,330 AU. The Hubble WFC3 shows a closer companion at a separation of 1.9″.[12] The system is a source for X-ray emission but the contributing component is unclear.[13]
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