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- W3106199870 abstract "We report the discovery of a new eclipsing EL CVn-type binary, consisting of a δ Sct-type pulsator and a thermally bloated low-mass pre-He white dwarf (WD). Spectroscopy and time-series BV photometry of V1224 Cas were carried out. The spectroscopy reveals a spectral type of A3 for the star. Light curve modeling indicates that V1224 Cas is a short-period detached system containing a possible low-mass WD with an effective temperature of about 9516 K. Based on the effective temperature and the surface gravity of the A-type primary star from the spectroscopic results, the absolute parameters of the components were estimated as: MP = 2.16 ± 0.22M☉, RP = 3.54 ± 0.12R☉, LP = 55.9 ± 6.9L☉, MS = 0.19 ± 0.02M☉, RS = 0.97 ± 0.04R☉, and LS = 6.9 ± 0.6L☉. We therefore introduce V1224 Cas as a new EL CVn-type binary candidate. The light curves in both filters all show multi-periodic pulsations, superimposed on binary effects. We performed a preliminary frequency analysis of the light residuals after removing the synthetic eclipsing curve from the original observational data. The results suggest that the rapid light variations among the light curves could be attributed to the δ Sct-type primary component. We therefore conclude that V1224 Cas is very likely a WD+δ Sct binary." @default.
- W3106199870 created "2020-11-23" @default.
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- W3106199870 date "2018-10-08" @default.
- W3106199870 modified "2023-10-13" @default.
- W3106199870 title "V1224 Cas: An EL CVn-type Eclipsing Binary Consisting of a Helium White Dwarf Precursor and a Delta Scuti Pulsator" @default.
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- W3106199870 doi "https://doi.org/10.3847/1538-3881/aade52" @default.
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