AAVSO: American Association of Variable Star Observers

CCD Photometry, Light Curve Deconvolution, Period Analysis, and Evolutionary Status of the HADS Variable V417 Boötis

Volume 50 number 1 (2022)

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Kevin B. Alton
Desert Blooms Observatory, 70 Summit Avenue, Cedar Knolls, NJ 07927; kbalton@optonline.net
W. Allen Gilchrist, Jr.
Stonecrest Observatory, 104 Deer Ridge Drive, Fort Davis, TX 79734; gilchrist.allen@ymail.com

Abstract

CCD-derived photometric B- and V-magnitude data were acquired from V417 Boo, an intrinsic variable classically defined as a High Amplitude δ Scuti (HADS) star. Deconvolution of precise time-series light curve data was accomplished using discrete Fourier transformation and revealed a fundamental mode (f0) of oscillation at ~ 11.5408 d–1 along with three other partial harmonics (2f0–4f0). No other statistically significant frequencies were resolved following successive pre-whitening of each residual signal. An assessment of potential period changes over time was performed using five new times of maximum (ToMx) light produced from the present study along with 34 other ToMx values mined from the AAVSO VSX archives. These results indicate that no substantive change in the fundamental period of oscillation or amplitude (V-mag) has likely occurred over the past 11 years. Finally, an investigation with PARSEC models for generating stellar tracks and isochrones provided valuable insight into the evolutionary status and physical nature of V417 Boo.