4 citations · 16 across the 23 of their papers we have counts for
23 papers
Long Secondary Periods in Pulsating Red Giants: A Century of Investigation
John R. Percy
Red giants are unstable to radial pulsation. About a third of them also show a long secondary period, 5 to 10 times the pulsation period. The long secondary periods were recently a…
Period Analysis of All-Sky Automated Survey for Supernovae (ASAS-SN) Data on Pulsating Red Giants
John R. Percy, Lucas Fenaux
The All-Sky Automated Survey for Supernovae (ASAS-SN) has recently used over 2000 days of data to identify more than 50,000 variable stars, automatically classify these, determine…
ASAS-SN Observations of the Pulsation of some R Coronae Borealis (RCB) Stars
John R. Percy
Photometry from the All-Sky Automated Survey for Supernovae (ASAS-SN), along with the AAVSO VSTAR time-series analysis package has been used to study the pulsational properties of…
A Study of Pulsation and Fadings in some R Coronae Borealis Stars
John R. Percy, Kevin H. Dembski
We have measured the times of onset of recent fadings in four R CrB stars -- V854 Cen, RY Sgr, R CrB, and S Aps. These times continue to be locked to the stars' pulsation periods,…
Do the Pulsation Properties of Red Giants Vary around their Long Secondary Period Cycle?
John Percy, Kunming Di
We have used visual and Johnson V observations from the American Association of Variable Star Observers (AAVSO) International Database, and the AAVSO VSTAR time-series package, and…
Long-Term Changes in the Variability of Pulsating Red Giants (and One R CrB Star)
John R. Percy, Arthur Lei Qiu
We have used many decades of visual observations from the AAVSO International Database, and the AAVSO time-series analysis package VSTAR, to study the long-term changes in period,…