Discovery of the Double-mode Pulsation of Variable Star GH Del

Research Notes of the AAS 2026 Open access

Read full text
Authors: Ivo Peretto, S. Lora, Lorenzo Sassaro, Giovanni Furlato, Giuseppe Peretto, Matilde Barbieri, William Rivato, N. Ruocco, Antonino Brosio, Giulio Scarfì, Nico Montigiani, Massimiliano Mannucci
+5 more Davide Agnetti, Alessandro Marchini, Giancarlo Madiai, Lorenzo Barbieri, C. Lopresti
DOI: 10.3847/2515-5172/ae43ea
Cited by: 0
References: 8

Abstract

Abstract The variable star GH Del was classified by the Variable Star Index as an RR Lyrae type variable. The SSV-UAI-GRAV, variable stars section of the UAI (Italian Amateur Astronomers Union), undertook an observation campaign for the star GH Del in order to determine its pulsation mode. GH Del was found to be a double-pulsation RR Lyrae variable star, therefore classified as RRd, with a fundamental period of 0.446375 day (10.7 hr) and the first overtone with a period of 0.330959 day (7.9 hr), whose ratio of 0.7414 confirms the accuracy of the classification.

Fields of Study & Subjects

Stellar planetary and galactic studies Astronomy and Astrophysical Research History and Developments in Astronomy

Publication details

Journal / source
Research Notes of the AAS
Volume
10
Issue
2
Pages
30–30
Publication date
12 February 2026
Language
EN