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A team from Conicet San Juan achieved greater precision to measure stellar parameters

The team developed a spectroscopic method that surpasses in precision those known so far.
Science
10 January, 2019

A team of the Institute of Astronomical Sciences of Earth and Space (Icate), of the Conicet, achieved maximum precision in measuring star parameters, a procedure that was published in the specialized journal Astronomy & Astrophysics, the agency reported.
Star parameters play a fundamental role in understanding astrophysical problems and in performing calculations such as star mass and radius, age and detailed chemical composition of stars.
In this sense, the group led by Carlos Saffe, assistant researcher of the Conicet at the Icate of the National University of San Juan made its contribution.
The team developed a spectroscopic, free-source method that surpasses in precision those known so far, which was published in the European specialized journal Astronomy & Astrophysics.
For the determination of fundamental parameters so far what is used is the so-called model scaled to the Sun, that is to say that a simulation of the atmosphere of a star is made and it is then assumed that the chemical composition of that star has a certain ratio of scale or proportion to that of the Sun, the Conicet detailed in its web.
“For example, if I evaluate some chemical elements such as titanium and calcium, and I notice that in the Sun there is twice as much titanium as calcium, then for other stars I suppose they will also keep the same proportion, that is, they will have twice as much titanium as calcium,” Saffe explained.
In this search for greater precision, the Institute’s researchers set out to do something closer to reality: “We redetermine the chemical pattern so that it is as close to the true pattern of the star and with this we recalculate the parameters (iteration).”
Saffe pointed out that “the first step in our method is similar to the classic case, starting from a model scaled to the Sun and thus we calculated the chemical composition. Then we recalculate everything, but without assuming that the composition of the star is climbing – that is, scale- to the Sun, but we use the true pattern of the star, by means of a double iteration.”
Thus, the result of this new model brings scientists closer to one of the greatest challenges of astrophysics. “A more accurate detection of the possible chemical mark of the process of formation of planets,” said the professional.
Another feature of the new procedure, which was implemented in the computers of the university institute of San Juan, is that it is free source, so access will be granted to all authors who require it.

Source: Télam

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