| dbo:abstract |
TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is the primary of a possible trinary star system located at a distance of 26.7 parsecs from Earth in the southern direction in the constellation of Octans. It is a BY Draconis variable, with large starspots causing it to change brightness as it rotates every 13 hours. TYC 9486-927-1 has rapid rotation and coronal and chromospheric activity suggestive of a young age. Observations and multi-epoch radial velocity data suggest that TYC 9486-927-1 is a single, rapidly rotating star rather than a spectroscopic or tight visual binary. However, it is still possible that TYC 9486-927-1 is an equal mass binary with a face-on orbit and close separation. The candidate secondary stellar companion is 2MASS J21121598–8128452. It is a red dwarf star of spectral class M5.5. Its projected separation from the primary would be 62,700 AU. The candidate tertiary companion is 2MASS J21192028–8145446 - of spectral class M6 or M7 and at a projected separation of 31,000 AU from the primary. (en) TYC 9486-927-1 (aussi connue comme 2MASS J21252752−8138278 et FT Octantis) est une étoile située à une distance de 34,15 ± 0,08 pc (∼111 a.l.) de la Terre, dans la direction de la constellation australe de l'Octant. Il s'agit d'une naine rouge de type spectral M1V. C'est une étoile variable de type BY Draconis. L'étoile serait l'objet primaire d'un système planétaire ayant pour objet secondaire 2MASS J21265040−8140293. Cet objet substellaire, considéré comme une naine brune de type L, pourrait être une planète géante. Si l'hypothèse était confirmée, ce système serait le plus étendu des systèmes planétaires connus en janvier 2016. (fr) |
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TYC 9486-927-1 (aussi connue comme 2MASS J21252752−8138278 et FT Octantis) est une étoile située à une distance de 34,15 ± 0,08 pc (∼111 a.l.) de la Terre, dans la direction de la constellation australe de l'Octant. Il s'agit d'une naine rouge de type spectral M1V. C'est une étoile variable de type BY Draconis. (fr) TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is the primary of a possible trinary star system located at a distance of 26.7 parsecs from Earth in the southern direction in the constellation of Octans. It is a BY Draconis variable, with large starspots causing it to change brightness as it rotates every 13 hours. (en) |
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