Английская Википедия:HD 77338

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HD 77338 is a star with a close orbiting exoplanet companion in the southern constellation of Pyxis. It is too dim to be visible with the naked eye, having an apparent visual magnitude of 8.63.[1] The system is located at a distance of 149 light years, and it is drifting further away with a heliocentric radial velocity of 8.2 km/s.[2]

The spectrum of this star presents as a K-type subgiant with a stellar classification of K0 IV.[3] This indicates the star has exhausted the supply of hydrogen at its core and has begun to evolve away from the main sequence. It has 94%[4] of the mass of the Sun and 97% of the Sun's girth.[5] The star is spinning with a rotation period of roughly 33 days.[6] It is radiating 71% of the luminosity of the Sun from its photosphere at an effective temperature of 5,315 K.[4]

HD 77338 is enriched in its concentration of elements more massive than helium compared to the Sun, with a metallicity of 0.16,[5] but is much older at an age of 9.5 billion years.[4] It is unusually enriched in heavy elements for a star of its age. The anomalously high abundance of ions of manganese may indicate the star has recently passed through the common shell stage (engulfed a planet).[7]

Planetary system

In 2012, a planet, named HD 77338b, was discovered by the radial velocity method on a tight orbit with uncertain eccentricity.[8] Its equilibrium temperature is 954.8 K.[9]

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References

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Шаблон:Sky Шаблон:Stars of Pyxis

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  5. 5,0 5,1 Ошибка цитирования Неверный тег <ref>; для сносок Stassun_et_al_2016 не указан текст
  6. Ошибка цитирования Неверный тег <ref>; для сносок Suárez_et_al_2015 не указан текст
  7. Шаблон:Citation
  8. Ошибка цитирования Неверный тег <ref>; для сносок Jenkins2012 не указан текст
  9. HD 77338 b is an exoplanet orbiting the star HD 77338, located about 149.3 light-years (45.8 pc) away from Solar System. Its discovery was publicly announced on 2012