http://arxiv.org/abs/1602.07254
I created the Petersen diagram relative to all the Double Mode High Amplitude {\delta} Scuti stars listed in the AAVSO’s International Variable Star Index up to date December 29, 2015. For the first time I noticed that the ratio between the two periods P1/P0 seems in evident linear relation with the duration of the period P0, a finding never explicitly described in literature regarding this topic.
R. Furgoni
Wed, 24 Feb 16
24/48
Comments: 4 pages, 3 figures, 1 table in The Journal of the American Association of Variable Star Observers, vol.44 n.1, 2016