Details

Autor(en) / Beteiligte

• Withers, S
• Kantorowitz-Sapers, A
• Parsons, J
• Wu, J Y
• Delaney, P A

Titel

Photometric Monitoring and Period Changes in SX Phoenicis Star XX Cygni. IV

Ist Teil von

• Journal of the Royal Astronomical Society of Canada, 2021-12, Vol.115 (6), p.238

Ort / Verlag

Toronto: Royal Astronomical Society of Canada

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Over the last ten years, 135 new times of maximum light were collected at the Allan I. Carswell Observatory (York University, Toronto) and 723 new times of maximum light were collected from the Transiting Exoplanet Survey Satellite (TESS).This work uses these new times of maximum light to discuss the period changes and pulsations of the δ Scuti star XX Cyg. A new O - C diagram for XX Cyg is presented, along with an updated period of 0.134865124(2) days. The period of XX Cyg is found to be increasing continuously with a rate of(1/P)(dP/dt) = (1.12 ± 0.06) x 10-8yr-1. Fourier analysis performed on the TESS data shows that XX Cyg pulsates with a fundamental frequency of 7.408(8) cycles day-1. Pulsations are also reported at 17 other harmonic frequencies.