Short-period pulsating hot-subdwarf stars observed by TESS II. Northern ecliptic hemisphere
Astronomy & Astrophysics(2024)
摘要
We present results of a continuation of our Transiting Exoplanet Survey
Satellite (TESS) search for short-period pulsations in compact stellar objects
observed during Years 2 and 4 of the TESS mission that targeted the northern
ecliptic hemisphere. For many of the targets, we exploit unpublished
spectroscopic data to confirm or determine the object's spectral
classification. From the TESS photometry, we identify 50 short-period
hot-subdwarf pulsators, including 35 sdB and 15 sdOB stars. The sample contains
26 pulsators not known before the TESS mission. Nine stars show signals at both
low and high frequencies, and are therefore “hybrid” pulsators. For each
pulsator, we report the list of prewhitened frequencies and we show amplitude
spectra calculated from the TESS data. We attempt to identify possible
multiplets caused by stellar rotation, and we report five candidates with
rotation periods between 11 and 46d. Having the search for p-mode pulsating hot
subdwarfs in TESS Sectors 1 - 60 done, we discuss the completeness of the
study, as well as instability strip and the evolutionary status of the stars we
found. We also compare the distribution of pulsation periods as a function of
effective temperature and surface gravity with theoretical predictions.
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