2026RNAAS..10...30P

Query : 2026RNAAS..10...30P

2026RNAAS..10...30P - Research Notes of the AAS, 10, 30 (2026/February-0)

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

PERETTO I., LORA S., SASSARO L., FURLATO G., PERETTO G., BARBIERI M., RIVATO W., RUOCCO N., BROSIO A., SCARFI G., MONTIGIANI N., MANNUCCI M., AGNETTI D., MARCHINI A., MADIAI G., BARBIERI L. and LOPRESTI C.

Abstract (from CDS):

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.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Variable stars - RR Lyrae variable stars - Multi-periodic variable stars - Double-mode variable stars - Double-mode pulsation

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 UCAC4 520-128007 * 20 23 40.840176 +13 58 44.48208   15.792 15.156 15.245   ~ 1 0
3 UCAC4 520-128029 * 20 23 47.803272 +13 59 02.48028   15.113 14.437 14.331   ~ 1 0
4 V* GH Del RR* 20 23 48.2424674400 +13 58 30.617009508           ~ 6 0
5 UCAC4 520-128035 * 20 23 50.071008 +13 59 54.22020       15.336   ~ 1 0

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