Английская Википедия:8 Ursae Minoris
Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
8 Ursae Minoris is a 7th-magnitude red clump star in Ursa Minor. The star is unusually rich in lithium, with an abundance of A = Шаблон:Val.[1][2][3]
In the 2019 NameExoWorlds competition, the star was assigned to contestants in South Korea. It was named Baekdu after Paektu Mountain, the tallest mountain in North Korea.[4][5]
Planetary system
One exoplanet was discovered in 2015 by the Bohyunsan Optical Astronomy Observatory.[6] It has a tight 93-day orbit at a distance of about 0.5 AU, which is unusually close for a giant host star — it should have been consumed during a previous expansion to 0.7 AU.[7][8] It is officially named Halla after Hallasan, the tallest mountain in South Korea.[4][8] There is also a stellar activity cycle of 65 days, and possibly a second companion orbiting at a distance of at least 5 AU.[3]
Шаблон:Orbitbox planet begin Шаблон:Orbitbox planet Шаблон:End
A 2023 study suggests that 8 Ursae Minoris was initially a binary star with star masses of Шаблон:Val. When the heavier star reached the end of the main sequence about Шаблон:Val, it expanded until it dumped all of its mass onto the secondary and became a helium white dwarf. The other star eventually engulfed this white dwarf at around Шаблон:Val, causing helium burning to start prematurely and forming the star that we know today. The planet may have survived the episode as a former circumbinary planet, or it may have formed from material ejected during the stellar merger. 8 Ursae Minoris is now in the red clump stage, and the planet will eventually be engulfed once it reaches the asymptotic giant branch.[3]
References
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- Английская Википедия
- G-type giants
- Planetary systems with one confirmed planet
- Stars with proper names
- Flamsteed objects
- Ursa Minor
- Henry Draper Catalogue objects
- Hipparcos objects
- Durchmusterung objects
- 2MASS objects
- Horizontal-branch stars
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