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 referred to as HD 345439. Outcomes of this observational marketing campaign, printed Nov. 1 on the arXiv pre-print server, shed extra mild on the properties of this star.
Magnetic stars of spectral sort O, B, and A (OBA) are comparatively uncommon—for example, solely 11 magnetic O-type stars are recognized so far. Observations present that they exhibit distinctive phenomena, equivalent to cyclic variability in line profile morphologies. Provided that the formation mechanism of magnetic fields in these stars continues to be not totally understood, finding out objects of this kind is crucial to advance our data about this course of.
Situated some 7,000 mild years away from the Earth, HD 345439 is a helium-rich huge magnetic star exhibiting extraordinarily robust, large-scale magnetic fields and quick rotation. Latest observations have discovered that the star is about seven occasions bigger and practically 9 occasions extra huge than the sun. HD 345439 has longitudinal magnetic fields showcasing periodic variability with an amplitude of some 2–3 kG, and the polar magnetic power of this star reaches 10 kG.
As a way to get extra insights into the properties of this peculiar star, a staff of astronomers led by Dong-Xiang Shen of the Xinjiang College in Urumqi, China, carried out photometric observations of HD 345439 in late 2020.
“Right here, we intention to offer extra detailed traits of the quickly rotating magnetic early-type star HD 345439 utilizing NOWT photometric observations,” the researchers wrote within the paper.
In response to the research, 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 attributable to an offset between the middle of the dipolar magnetic fields and the rotation axis.
On the whole, the profiles and amplitudes of the sunshine curves have been discovered to be roughly per the archival information. The brand new observations discovered no proof of pulsating habits in HD 345439.
NOWT information allowed Shen’s staff to derive the rotational interval of HD 345439. It was calculated that it takes this star practically 18.5 hours to rotate round its axis, which is per earlier estimates.
New analysis discovered that HD 345439 is smaller and fewer huge than beforehand thought because it has a radius of about 5.6 solar radii and a mass of eight solar plenty. The outcomes counsel that the star is roughly 26.8 million years previous, has an effective temperature of round 22,000 Okay, and its metallicity is at a degree of -0.5. The space to HD 345439 was estimated to be 6,982 light years.
Extra info:
Dong-Xiang Shen et al, Photometric properties and stellar parameters of the quickly rotating magnetic early-B star HD 345439, arXiv (2022). DOI: 10.48550/arxiv.2211.00271
Journal info:
arXiv
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Examine unveils properties of the quickly rotating magnetic star HD 345439 (2022, November 9)
retrieved 9 November 2022
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