Gamma Trianguli Australis

Characteristics

The spectrum of this star matches a stellar classification of A1 III, which identifies it as a giant star. It could be also a subgiant. An unusual abundance of the element europium demonstrates it to be a peculiar, or Ap star. However, its classification as a chemically peculiar star is doubtful. Most stars of this type are slow rotators, but Gamma Trianguli Australis displays a very high rate of rotation with a projected rotational velocity of 199 km s⁻¹.

At a mass of 3.04 solar masses, Gamma Trianguli Australis was a late B-type star (B8V/B9V) in the main sequence. Being 350 million years old, it has recently begun its expansion towards a red giant. Its radius is either 7 R_☉ (estimated using stellar isochrones) or 6.5 R_☉ (measured). The star is emitting a luminosity equivalent to 250 solar luminosities. Its surface has an effective temperature of 8,225 K. This is around 2,450 K hotter than the Sun and gives it a white hue, typical of A-type stars.

This star shows an excess emission of infrared radiation, suggesting that there is a circumstellar disk of dust orbiting this star. The mean temperature of the emission is 50 K, corresponding to a separation from the star of 481 astronomical units.