Spanish scientists have found a new carbon-rich supermetallic star in the halo of the Milky Way. The object is designated as J0815 + 4729. The star can act as one of the poorest on iron.
Chemically primitive low metal stars are important for studying the conditions of early space. Therefore, researchers are interested in finding such objects. A greater body of knowledge about them is capable of expanding our understanding of stellar formation and evolution.
Recently, scientists from the University of La Laguna conducted a comprehensive study of the spectroscopic data provided by various instruments. They looked at more than 2.5 million low-resolution spectra from the Slanov review for galactic understanding, baryon oscillation spectroscopy (BOSS) and to an optical spectroscope (LAMOST).
OSIRIS J0815 + 4729 medium resolution spectrum (black line) and the best review from FERRE (red line) They managed to find about 100 candidates for metal objects. For further review, Spectral Dispersive Spectrography and an imaging system (ISIS) were used on the 4.2-meter Herschel telescope, as well as an optical system for imaging and instrumental spectroscopy (OSIRIS).
This helped find a carbon-rich star J0815 + 4729 with an unstable metal line. It belongs to the main sequence stars and is located in the galactic halo (in 7500 light years from the center of the Milky Way and in 32600 light years from the Earth). The effective temperature rises to 6215 K.
Metallicity reaches approximately -5.8 dex, and the carbon content is 5.0 dex. This means that scientists may have found the star that is the poorest in iron, and also the richest in carbon. The researchers emphasize that the observation of such objects will allow to study the early chemical evolution of the galaxy.