TX Piscium [SEP] constellation
TX Piscium
TX Piscium (19 Piscium) is a variable carbon star in the constellation Pisces. It is amongst the reddest naked eye stars, with a significant reddish hue when seen in binoculars. It is approximately 900 light years from Earth.
Spectrum.
TX Piscium is a very red star, 2.6 magnitudes fainter at blue wavelengths than in the middle of the visual range, and another 3.3 magnitudes fainter in the ultraviolet.
It has been given a spectral class C7,2, indicating a relatively cool carbon star with
several TDUs, the abundance of carbon in the atmosphere begins to exceed that of oxygen and then the star is known as a carbon star. In TX Piscium, the carbon/oxygen ratio is calculated to be 1.03, which is at the low end of the scale of carbon stars. It is thought to be a relatively new carbon star.
TX Piscium has a mass of approximately . Modelling of its observed properties suggest a mass between , while evolutionary models suggest a mass between . In particular, stars with a mass