Epsilon Indi A
Spectral type: K4.5V
U-B color index 1.00
B-V color index 1.06
Absolute magnitude: 6.89
Temperature: 4,280 K
Rotation: 23 days (0.7 km/s)
Age: 1.3 × 109 years
Epsilon Indi A is a dimmer dwarf star of spectral type K4.5V, located about 11.8 light years from the UCP Sol system control world. Central component of the Epsilon Indi system with two brown dwarf companions, Epsilon Indi Ba and Epsilon Indi Bb.
The corona of Epsilon Indi has an X-ray luminosity Lx = 2×1027 ergs s-1 and an estimated coronal temperature of 2×106 K. The stellar wind of this star expands outward, producing a bow shock at a distance of 63 AU. Downstream of the bow, the termination shock reaches as far as 140 AU from the star.
Companions
Both brown dwarfs are of spectral class T; the more massive, ε Indi Ba, has been classified as spectral type T1V, while its less massive companion, Epsilon Indi Bb, has been classified as spectral type T6V.
effective temperature of 1280 ± 40 K and 850 ± 20 K for Epsilon Indi Ba and Epsilon Indi Bb, respectively.
