000007347 001__ 7347
000007347 005__ 20250116195608.0
000007347 0247_ $$2DOI$$a10.1017/pasa.2024.76
000007347 037__ $$aSCART-2025-0034
000007347 100__ $$aKahraman Aliçavuş, Filiz
000007347 245__ $$aOn the existence of `Maia variables'
000007347 260__ $$c2024
000007347 520__ $$aThere are different classes of pulsating stars in the H-R diagram. While many of those classes are undisputed, some remain a mystery such as the objects historically called ‘Maia variables’. Whereas the presence of such a class was suggested seven decades ago, no pulsational driving mechanism is known that could excite short-period oscillations in these late B to early A-type stars. Alternative hypotheses that would render the reports of variability of those stars erroneous have been proposed such as incorrect effective temperatures, binarity or rapid rotation, but no certain conclusions have been reached yet. Therefore, the existence of these variables as a homogeneous class of pulsating star is still under discussion. Meanwhile, many new candidates of these variables have been claimed especially by using photometric observations of space telescopes. In this study, we examined 31 objects that are alleged members of this hypothetical group and carried out detailed spectroscopic and photometric analyses to test the proposed hypotheses for their cause of variability. The Teff, log g, v sin i, and chemical abundances of the targets were determined and the TESS photometric data were examined. As a result, we found that most of these targets are located inside the δ Scuti, β Cephei, or SPB star instability strips, a few show evidence for binarity and others for rapid rotation. We give arguments that none of the apparently rapid pulsations in our targets is caused by a star outside any known instability strip. By extrapolation, we argue that most stars proposed as pulsators outside well-established instability domains are misclassified. Hence there is no sufficient evidence justifying the existence of a class of pulsating stars formerly known as the ‘Maia variables’.
000007347 594__ $$aNO
000007347 6531_ $$aStars: oscillations
000007347 6531_ $$aStars: variables: general
000007347 6531_ $$aTechniques: photometric
000007347 6531_ $$aTechniques: spectroscopic
000007347 6531_ $$aAstrophysics
000007347 6531_ $$aSolar and Stellar Astrophysics
000007347 700__ $$aHandler, Gerald
000007347 700__ $$aChowdhury, Sowgata
000007347 700__ $$aNiemczura, Ewa
000007347 700__ $$aJayaraman, Rahul
000007347 700__ $$aDe Cat, Peter
000007347 700__ $$aOzuyar, Dogus
000007347 700__ $$aAliçavuş, Fahri
000007347 773__ $$ce082$$pPublications of the Astronomical Society of Australia$$v41$$y2024
000007347 8560_ $$fpeter.decat@ksb-orb.be
000007347 8564_ $$s3174070$$uhttp://publi2-as.oma.be/record/7347/files/KahramanAliçavuş2024_PASA41_e82.pdf
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000007347 905__ $$apublished in
000007347 980__ $$aREFERD