SIMBAD references

2025ApJ...993...34D - Astrophys. J., 993, 34 (2025/November-1)

Hunt for the mHz Variability in TESS and XMM-Newton Observations of Nova-like Cataclysmic Variables.

DOBROTKA A., MAGDOLEN J. and MELICHERCIK M.

Abstract (from CDS):

We analysed the flickering of selected nova-like cataclysmic variables observed by the TESS satellite and XMM-Newton. We searched for break frequencies (fb) in the corresponding power density spectra (PDSs), and for any long-term evolution. We find a new optical fb in three nova-like systems, and confirm that the value of this frequency is clustered around 1 mHz. V504 Cen and V751 Cyg show possible X-ray counterparts of fb that had previously only been seen in MV Lyr. This points toward the very central disk for source localization. We investigated a previously proposed correlation between white dwarf mass and fb, but thanks to the new measurements, we do not confirm its existence. V3885 Sgr and V1193 Ori show flaring activity in the long-term light curve during which TESS observations were made. The corresponding PDSs show changes in shape and the disappearance of fb. TT Ari and SGRt 062340.2-265715 exhibit smooth changes in the long-term optical light curve, and the corresponding TESS observations show variable fb during these changes. fb is higher at lower brightness levels, which so far has been observed only in MV Lyr.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Stellar accretion disks - Cataclysmic variable stars - White dwarf stars

Simbad objects: 57

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