The Complex System of ASAS J110528+0545.0

• Published in: Research notes of the AAS Vol. 9; no. 8; pp. 210 - 209
• Main Authors: Peretto, Ivo, Lora, Stefano, Sassaro, Lorenzo, Furlato, Giovanni, Peretto, Giuseppe, Barbieri, Matilde, Rivato, William, Madiai, Giancarlo, Barbieri, Lorenzo, Valvasori, Adriano, Quadri, Ulisse, Strabla, Luca, Madurini, Paolo, Scarfì, Giulio, Lopresti, Claudio, Galli, Gianni
• Format: Journal Article
• Language: English
• Published: The American Astronomical Society 05.08.2025
• Subjects: Ellipsoidal variable stars; RS Canum Venaticorum variable stars; Starspots; Variable stars
• ISSN: 2515-5172; 2515-5172
• DOI: 10.3847/2515-5172/adf6af

In this study, we present the reclassification of the star ASAS J110528+0545.0, known as a DSCT-type variable star in the Variable Star Index. The SSV–UAI–GRAV research section of the Unione Astrofili Italiani (UAI) has planned an observation campaign with eight ground-based observatories in 2025 April and May to study the accuracy of its classification. From the observational sessions obtained, combined with the available data from the All-Sky Automated Survey for Supernovae and ASAS-3 surveys, the star ASAS J110528+0545.0 has been reclassified as ELL/RS. The orbital period of the pair of stars was found to be 0.421875 day with a variation of 0.07 mag V, while the long-term study of the surveys revealed a slow but detectable variation in the average magnitude caused by the chromospherically active nature of one of the two stars or by surface spots.