AAVSO: American Association of Variable Star Observers

New Observations of the SX Phe Star XX Cygni (Abstract)

Volume 49 number 1 (2021)

Richard Berry
22614 North Santiam Highway, Lyons, OR 87358; rberry@wvi.com
Nolan Sottoway
Address correspondence to: R. Berry, 22614 North Santiam Highway, Lyons, OR 87358; rberry@wvi.com
Sol McClain
Address correspondence to: R. Berry, 22614 North Santiam Highway, Lyons, OR 87358; rberry@wvi.com

Abstract

(Abstract only) We report 20+ new times of maximum light of the short period pulsator XX Cygni measured during the August 2020 Pine Mountain Observatory “Virtual Astronomy Camp” for high-school students. Observations were made at a cadence of 10 seconds, producing dense light curves. We determined each time of maximum by fitting ~ 250 data points near the peak with a six-order polynomial. Assuming a constant period for the star, the standard error from the ephemeris is 0.00025 day = 22 seconds. We saw no evidence for early or late time-of-max during our observing campaign.