Identifying 850 delta Scuti pulsators in a narrow Gaia colour range with TESS 10-minute full-frame images

Abstract

We use TESS 10-minute Full Frame Images (Sectors 27-55) to study a sample of 1708 stars within 500 pc of the Sun that lie in a narrow colour range in the centre of the delta Scuti instability strip (0.29 < BP-RP < 0.31). Based on the Fourier amplitude spectra, we identify 848 delta Scuti stars, as well as 47 eclipsing or contact binaries. The strongest pulsation modes of some delta Scuti stars fall on the period-luminosity relation of the fundamental radial mode but many correspond to overtones that are approximately a factor of two higher in frequency. Many of the low-luminosity delta Scuti stars show a series of high-frequency modes with very regular spacings. The fraction of stars in our sample that show delta Scuti pulsations is about 70% for the brightest stars (G<8), consistent with results from Kepler. However, the fraction drops to about 45% for fainter stars and we find that a single sector of TESS data only detects the lowest-amplitude delta Scuti pulsations (around 50 ppm) in stars down to about G=9. Finally, we have found four new high-frequency delta Scuti stars with very regular mode patterns, and have detected pulsations in lambda Mus that make it the fourth-brightest delta Scuti in the sky (G=3.63). Overall, these results confirm the power of TESS and Gaia for studying pulsating stars.

published in MNRAS; 10 pages, 13 figures

References in corpus (24)

• Array Programming with NumPy
• Gaia Early Data Release 3: Photometric content and validation
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• Modern stellar spectroscopy caveats
• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
• The first view of $\delta$ Scuti and $\gamma$ Doradus stars with the TESS mission
• A classifier for spurious astrometric solutions in Gaia EDR3
• Very regular high-frequency pulsation modes in young intermediate-mass stars
• The period-luminosity relation for delta Scuti stars using Gaia DR2 parallaxes
• Gaia Data Release 3: Pulsations in main sequence OBAF-type stars
• Magnetic braking saturates: evidence from the orbital period distribution of low-mass detached eclipsing binaries from ZTF
• New pulsating stars detected in EA-type eclipsing binary systems based on TESS data
• Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3
• TESS observations of the Pleiades cluster: a nursery for delta Scuti stars
• Periodic variable A-F spectral type stars in the northern TESS continuous viewing zone
• Observational and Theoretical Studies of 27 $\delta$ Scuti Stars with Investigation of the Period-Luminosity Relation
• Determining the seismic age of the young open cluster $\alpha$ Per using $\delta$ Scuti stars
• Asteroseismology of $\delta$ Scuti stars: emulating model grids using a neural network
• Pulsational instability of pre-main-sequence models from accreting protostars II. Modelling echelle diagrams of $\delta$ Scuti stars without rotational splitting
• Dating young open clusters using delta Scuti stars. Results for Trumpler 10 and Praesepe
• A need to revise stellar opacities from asteroseismology of $\delta$ Scuti stars
• Pulsation Analysis of High-Amplitude $\delta$ Scuti Stars with TESS
• A segmented period-luminosity relation for nearby extragalactic $\delta$ Scuti stars
• Asteroseismic age constraints on the open cluster NGC 2477 using oscillating stars identified with TESS FFI

Cited by in corpus (2)

• Mode identification and ensemble asteroseismology of 119 $\beta$ Cep stars detected by Gaia light curves and monitored by TESS
• Characterizing bright $\delta$ Scuti pulsators using TESS lightcurves