Study unveils properties of the rapidly rotating magnetic star HD 345439

Utilizing the Nanshan One-meter Broad-field Telescope (NOWT), Chinese language astronomers have carried out multi-color photometric observations of a quickly rotating magnetic star often known as HD 345439. Outcomes of this observational marketing campaign, printed Nov. 1 on the arXiv pre-print server, shed extra gentle on the properties of this star.

Magnetic stars of spectral kind O, B, and A (OBA) are comparatively uncommon—for example, solely 11 magnetic O-type stars are identified to this point. Observations present that they exhibit distinctive phenomena, similar to cyclic variability in line profile morphologies. On condition that the formation mechanism of magnetic fields in these stars continues to be not absolutely understood, finding out objects of this kind is important to advance our data about this course of.

Situated some 7,000 gentle years away from the Earth, HD 345439 is a helium-rich large magnetic star exhibiting extraordinarily robust, large-scale magnetic fields and quick rotation. Current observations have discovered that the star is about seven instances bigger and almost 9 instances extra large than the sun. HD 345439 has longitudinal magnetic fields showcasing periodic variability with an amplitude of some 2–3 kG, and the polar magnetic energy of this star reaches 10 kG.

To be able to get extra insights into the properties of this peculiar star, a crew of astronomers led by Dong-Xiang Shen of the Xinjiang College in Urumqi, China, performed photometric observations of HD 345439 in late 2020.

“Right here, we purpose to supply extra detailed traits of the quickly rotating magnetic early-type star HD 345439 utilizing NOWT photometric observations,” the researchers wrote within the paper.

In line with the examine, the shapes of the sunshine curves of photometric observations of HD 345439 present a typical double uneven S-wave function arising from the star’s magnetic clouds. The researchers assume that such a function could also be brought on by an offset between the middle of the dipolar magnetic fields and the rotation axis.

Basically, the profiles and amplitudes of the sunshine curves have been discovered to be roughly in line with the archival information. The brand new observations discovered no proof of pulsating habits in HD 345439.

NOWT information allowed Shen’s crew to derive the rotational interval of HD 345439. It was calculated that it takes this star almost 18.5 hours to rotate round its axis, which is in line with earlier estimates.

New analysis discovered that HD 345439 is smaller and fewer large than beforehand thought because it has a radius of about 5.6 solar radii and a mass of eight solar lots. The outcomes recommend that the star is roughly 26.8 million years outdated, has an effective temperature of round 22,000 Okay, and its metallicity is at a stage of -0.5. The gap to HD 345439 was estimated to be 6,982 light years.

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