Photometric Observations of the Dwarf Nova AH Herculis

Volume 49 number 2 (2021)

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Corrado Spogli

Via Palazzolo 21 Frazione Spada 06020 Gubbio (PG), Italy; corradospogli@yahoo.it

Gianni Rocchi

Via Achille Grandi 14, 06038 Spello (PG), Italy; giannirocchi2@gmail.com

Stefano Ciprini

Space Science Data Center, Agenzia Spaziale Italiana (SSDC-ASI), I-00133, Roma, Italy, and Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Roma Tor Vergata, I-00133, Roma, Italy; stefano.ciprini.asdc@gmail.com

Dario Vergari

Via Cantalmaggi 24, 06024 Gubbio (PG), Italy

Jacopo Rosati

Via XVIII Maggio N°4 06024 Gubbio (PG), Italy; jacopo.rosati@studenti.unipg.it

Abstract

We present the results of 274 nights of observations of the dwarf nova AH Herculis made in the years 2012, 2014, 2017, and 2018 for a total of 725 photometric data points. Observations were made in the B, V, Rc, and Ic Johnson-Cousins photometric bands. In 2012 AH Her was observed for 49 nights, in 2014 for 21 nights, and in 2017 and 2018 for 102 nights each year. Overall, we obtained 186 data points with the photometric filter B, 270 observations with the V filter, 165 with the Rc filter, and 104 with the Ic filter. The variable was well sampled in 2017 and 2018 and was observed on almost all clear nights; comments are missing in some filters due to technical problems with the filter wheel. The observations were all made at Gianni Rocchi’s private observatory. In 2017 and 2018 we observed several outbursts of AH Her and in 2017 a standstill of short duration. In this work we present the observational data, the light curves obtained in 2012, 2017, and 2018, a study of the color indices, and the temporal characteristics of the outbursts of this dwarf nova.