We report the classification of 24 puzzling short-period variable stars located in OGLE-IV Galactic bulge fields. The stars are low-amplitude (<0.05 mag) multi-periodic objects with dominant periods between 22 and 54 min whose type could not have been unambiguously established based on photometry only. A low-resolution spectroscopic follow-up has shown that all the objects are main sequence A/F-type stars. Thus, all the variables are delta Sct-type pulsators. We have added them to the OGLE-IV Collection of Variable Stars.
OGLE photometric data are available to the astronomical community from the OGLE Internet Archive and interactive on-line inteface OCVS (OGLE Collection of Variable Stars) search form.
PLEASE cite the following paper when using the data or referring to these OGLE results:
Pietrukowicz et al., 2022, Acta Astronomica, 72, 161 (arXiv:2212.07355)
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