(ORDO NEWS) — Analyzing data from NASA’s Transiting Exoplanet Survey Satellite (TESS), Turkish astronomers have discovered 10 new pulsating variable stars.
A team of astronomers led by Filiz Kahraman Alikavs of Canakkale Onsekiz Mart University in Turkey discovered five Delta Scuti stars, one Doradus gamma variable, and four hybrid systems.
Delta Scuti stars are pulsating variable stars of spectral types A0-F5, named after the Delta Scuti variable in the constellation Scutum.
They exhibit radial and non-radial pulsations spanning periods from 20 minutes to 8 hours. Studying the fluctuating behavior of Delta Scuti variables can help us expand our knowledge of the interior of stars.
As for the variables of the Doradus gamma type, these are dwarf or subdwarf variables with the spectral type A7-F5 and periods of the order of one day.
The new Delta Shield type variables, designated TIC 25537276, TIC 177422294, TIC 2554307, TIC 279874050 and TIC 370599803, have effective temperatures between 6812 and 7394 K while their bolometric luminosities are in the range of 0.69-2.23.
TIC 308447073 is the only Doradus gamma variable found in the study. Its effective temperature is estimated at 7539 K and its bolometric luminosity is approximately 2.69.
The remaining four variables have been designated TIC 367910480, TIC 395520454, TIC 400502366, and TIC 431375592.
Their effective temperatures range from 6411 to 8476 K. The bolometric luminosity of these stars ranges from 0.27 to 3.25.
They have been classified as hybrid variables as they exhibit both a Delta Scutum wobble and a Doradas gamma wobble at the same time.
The researchers explained that they classified 10 variables based on the frequency spectra and pulsation constant values of these stars.
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