Английская Википедия:Gamma2 Normae

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Шаблон:Short description

Шаблон:Other stars by Bayer designation Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end

Gamma2 Normae, Latinized from γ2 Nor, is the brightest star in the southern constellation of Norma. Its apparent magnitude is 4.02[1] – making it a faint star but visible to the naked eye. Based upon an annual parallax shift of 25.33 mas as seen from Earth,[2] this star is located roughly 129 light years from the Sun. It is moving closer to the Sun with a radial velocity of −29 km/s.[3]

This is an evolved, yellow-hued giant of spectral type K0 III[4] around 2.16[5] times as massive as the Sun that has swollen to a diameter 10 times that of the Sun.[6] It is a red clump star on the horizontal branch, which indicates it is generating energy through helium fusion at its core.[7] The star is radiating 51[8] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,699 K.[5]

Gamma2 Normae is a close double, with a magnitude 10 companion. The pair has been previously identified as a binary star system,[9] but the second release of Gaia data showed the companion star to be much more distant. Another 16-magnitude star, with a temperature of Шаблон:Val, is listed 20" away with nearly the same parallax and proper motion as Gamma2 Normae.[10]

γ1 Nor is a yellow supergiant located nearby on the celestial sphere, but is much further away from Earth and nearly a magnitude fainter.

References

Шаблон:Reflist

Шаблон:Stars of Norma

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  6. Шаблон:Cite web
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  10. Шаблон:Cite DR2