HD 131399
Star in the constellation Centaurus
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Key Takeaways
- HD 131399 is a star system in the constellation of Centaurus.
- 9 parsecs) away.
- 07, but because of interstellar dust between it and the Earth, it appears 0.
- The brightest star, is a young A-type main-sequence star, and further out are two lower-mass stars.
- Stellar system The brightest star in the HD 131399 system is designated HD 131399 A.
HD 131399 is a star system in the constellation of Centaurus. Based on the system's electromagnetic spectrum, it is located around 350 light-years (107.9 parsecs) away. The total apparent magnitude is 7.07, but because of interstellar dust between it and the Earth, it appears 0.22 ± 0.09 magnitudes dimmer than it should.
The brightest star, is a young A-type main-sequence star, and further out are two lower-mass stars. A Jupiter-mass planet or a low-mass brown dwarf was once thought to be orbiting the central star, but this has been ruled out.
Stellar system
The brightest star in the HD 131399 system is designated HD 131399 A. Its spectral type is A1V, and it is 2.08 times as massive as the Sun. The two lower-mass stars are designated HD 131399 B and C, respectively. B is a G-type main-sequence star, while HD 131399 C is a K-type main-sequence star. Both stars are less massive than the Sun.
HD 131399 B and C are located very close to each other, and the two orbit each other at about 10 AU. In turn, the B-C pair orbits the central star A at a distance of 349 astronomical units (au). This orbit takes about 3,600 years to complete, and it has an eccentricity of about 0.13 The entire system is about 21.9 million years old.
One paper has reported that HD 131399 A has a companion in an inclined 10-day orbit with a semi-major axis of 0.1 AU. HD 131399 A has been described as a "nascent Am star"; although it has a very slow projected rotation rate and would be expected to show chemical peculiarities, its spectrum is relatively normal, possibly due to its young age.
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