Using observational data obtained by the GAIA satellite, recently launched by the European Space Agency (ESA), and physical models for stars also observed by the KEPLER satellite and through analysis based on physical models for measurements along within photometric time series, the scientists published an impactful results on the properties of old stars similar to the Sun, and with consequences for the studies of the future of the Sun.
The international team of scientists led by Prof. José Dias do Nascimento Jr, from UFRN, currently at CfA-SAO Harvard, publish today in The Astrophysical Journal, a precise analysis of evolutionary status and rotation for a unprecedent sample of solar twins that rotate slowly than the Sun, and therefore older. The investigative research analyzed distances through the parallax measurements from GAIA satellite and photometry with the KEPLER satellite. More than 30,000 stars were observed with NASA’s Kepler and measurements of rotation periods and analysis of their distances was presented. Stars more massive or much smaller than the Sun were excluded from work.
“Our program’s started with 30,000 stars, and we investigated a sample of 193 solar analog stars, and we reported rotation periods for hundred of solar analogs. In this study we are also presenting for the first time, rotation period, as well a determination of evolutionary status.”
“From our sample, we are delivering 10 solar analogues slower than the Sun, and these objects represent the future of the Sun in terms of rotation period. These join results from our team and published in 2009. The already discovered stars CoRoT Sol 1, which was the first solar twin characterized photometrically by a space observatory and confirmed by spectroscopic observations with the 8.2-meter SUBARU telescope was the only one on this category. The Subaru telescope is installed near the summit of Mauna Kea mountain in Hawaii, USA. In this current project, some of these solar analogs are in the observational programs already started this week at the Mercator Telescope, in the Canary Islands (Photo above). This is a second stage of the project. The continuity of the research must reveal an important set of other characteristics of those objects”.
Link to paper: https://iopscience.iop.org/article/10.3847/1538-4357/ab9c16
UFRN Brazil Eduardo Nunes, Leandro Almeida, Jefferson Soares Matthieu Castro,
USP Brazil Jorge Melendez, Diego Lorenzo, Y. Galarza,
USA CfA-Harvard S. H. Saar, S. Meibom,
Germany Potsdam: S Barnes,
Austria P. G. Beck