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HomeNewsAstronomy and SpaceTurkish astronomers uncover new short-period pulsating variable star

Turkish astronomers uncover new short-period pulsating variable star

Field of the variable taken from IST40 telescope on the evening of February 23, 2020. Variable and comparability stars are marked in addition to the exoplanet host star XO-2. Credit: Sağlam et al., 2022.

Astronomers from the Istanbul University in Turkey report the discovering of a brand new short-period pulsating variable star throughout observations of the sector of exoplanet host star XO-2. The newly detected object is most certainly a Delta Scuti sort variable with a pulsation interval of lower than one hour. The discovery was detailed in a paper revealed June 29 on arXiv.org.

Detecting and finding out may supply vital hints into features of stellar construction and evolution. Investigation of variables could possibly be additionally useful for higher understanding of the space scale of the universe.

Delta Scuti stars are pulsating variables with spectral sorts between A and F, named after the Delta Scuti variable within the constellation Scutum. They exhibit radial and non-radial pulsations spanning intervals from 20 minutes to eight hours. Studying pulsation conduct of Delta Scuti variables may assist us advance our data about stellar interiors.

Now, a workforce of astronomers led by Mustafa Turan Sağlam has discovered a brand new variable that seems to be of Delta Scuti sort. They used the 0.4m Schmidt-Cassegrain telescope (IST40) of the Istanbul University Observatory to look at the exoplanet host star XO-2 inside a analysis program investigating transit timing variations. Afterward, complete follow-up photometric observations of the newfound star have been carried out to substantiate its variability.

“We present the detection of a new variable in the field of exoplanet host star XO-2. The new variable has been observed in 10 nights with different standard photometric filters besides white light observations,” the researchers wrote within the paper.

The pulsation interval of the brand new variable was measured to be roughly 0.95 hours, whereas its mass is estimated to be between 1.5 and 1.7 solar lots. It was discovered that the variable is of spectral sort A7 and has an of about 7,725 Ok. These properties are typical for Delta Scuti stars.

Moreover, the form of the sunshine curves of the newly detected variable and the automated classification based mostly on machine studying algorithms assist the Delta Scuti state of affairs. The calculate that the likelihood that this speculation is true is round 78%.

The research additionally discovered that the investigated star has a luminosity at a degree of about 6.93 solar luminosities and an absolute magnitude in V-band of roughly 2.76. The distance to this variable, based mostly on the information from ESA’s Gaia satellite, was estimated to be round 5,613 .

Summing up the outcomes, the researchers famous that additional observations of this variable are required so as to positively affirm its nature and to shed extra mild on conduct.

“Additional ground-based observations can be coupled together with TESS [Transiting Exoplanet Survey Satellite] short cadence observations to perform a deeper study of the new variable,” the authors of the research wrote.

V2455 Cyg is a high amplitude Delta Scuti star, new observations suggest

More info:
Mustafa Turan Sağlam et al, Discovery of a Short Period Pulsator from Istanbul University Observatory. arXiv:2206.14632v1 [astro-ph.SR], arxiv.org/abs/2206.14632

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Turkish astronomers uncover new short-period pulsating variable star (2022, July 7)
retrieved 7 July 2022
from https://phys.org/news/2022-07-turkish-astronomers-short-period-pulsating-variable.html

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