Two hot stars demonstrate magnetic fields.

Two hot stars demonstrate magnetic fields.

Researchers presented the first results of the project “The Great Influence of Magnetic Fields on the Evolution of Hot Stars” (LIFE). In determining the fundamental parameters of 15 stars, they noticed that the two objects have magnetic fields.

The main goal of LIFE is to search for magnetic fields in hot stars of the post-main sequence. The project also evaluates the magnetic flux conservation model and studies the effect of magnetic fields on stellar evolution and vice versa. For the search, the spectroscopic instrument ESPaDOnS on the Canada-France-Hawaii telescope is used.

During the observation, scientists were particularly interested in studying the evolving giants O, B, and A-type, as well as super giants with visual values ​​of 4.0–8.0. They were interested in understanding how magnetic fields evolve from the main to the late post-main sequence.

Two hot stars demonstrate magnetic fields.

LSD I, N and V profiles of 19 Auriga and HR 3042

The stars HR 3042 and 19 Voznikhey stood out in sight. The first is most likely a weak helium star, a chemically unique star at the end of the main sequence. Its age is 100 million years and it is about 5 times larger and more massive than the Sun. Refers to the spectral type B8 / 9II, and the effective temperature - 14150 K.

19 The airborne is more massive than HR 3042. It has 37 solar radii, and is 8 times more in mass. This is a star of the post-main spectral-type sequence A5Ib-II. The age is 24-57 mln. Years, and the effective temperature is 8500 K.

In addition, they identified a star HIP 38584, which may also have a magnetic field. The review shows that it is asymmetric, and therefore it can be double. The researchers hope that the project will find more stars with magnetic fields.

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