Spectroscopic Analysis of the 2025 Eclipse of the Symbiotic Binary V1413 Aquilae
Volume 54 number 2 (2026)
- David Boyd
- West Challow Observatory, West Challow, Oxfordshire, UK; davidboyd@orion.me.uk
- James R. Foster
- 800 Glenbrook Drive, Frazier Park, CA 93225; jrfcomet@sbcglobal.net
- Forrest Sims
- Desert Celestial Observatory, 5900 E Bell Street, Apache Junction, AZ 85119; forrest@simsaa.com
- David Cejudo
- Dark Sky Hosting Observatory (La Palma), Camino de las Canteras, 42; El Berrueco, Spain; davcejudo@hotmail.com
- Robin Leadbeater
- Three Hills Observatory, The Birches, Wigton, Cumbria, CA7 1JF, UK; robin@threehillsobservatory.co.uk
- Pavol A. Dubovsky
- Vihorlat Observatory, Kolonica 219, Kolonica, 06761, Slovakia; var@kozmos.sk
- Xavier Dupont
- 4 rue de l'Orée du Bois, 37390 Saint-Roch, France; xdupont@wanadoo.fr
- Keith Shank
- Oaks & Stars Observatory, 304 S. Rolling Oaks Drive, Goldthwaite, TX 76844; kasism@verizon.net
- David Daiku Trowbridge
- Tinyblue Observatory, 3537 Gylany Way, Greenbank, WA; david.daiku.trowbridge@gmail.com
- Jerry Hinnefeld
- Indiana University South Bend, 1700 Mishawaka Avenue, South Bend, IN 46634; jhinnefe@iu.edu
- Colin Eldridge
- 5 Booker Street, Attadale, Perth, Western Australia 6156; Colin-Eldridge@outlook.com
- Joan Guarro i Fló
- 25354 Santa Maria de Montmagastrell Remote Observatory, Av, Catalunya, 38, Spain; jngrrfl@gmail.com
- Kevin Gurney
- Gladstone Road Observatory, Sheffield, UK; kevingurney42@gmail.com
- Gary Walker
- 114 Cove Road, West Dennis, MA; bailyhill14@gmail.com
- Franz-Josef Hambsch
- Oude Bleken 12, Mol, B-2400, Belgium; hambsch@telenet.be
Abstract
We report on a coordinated campaign by amateur astronomers using a combination of high and low resolution spectroscopy to observe the 2025 eclipse of the symbiotic binary V1413 Aql shortly after a probable Z And-type symbiotic outburst. We measured the eclipse time of minimum and computed an updated eclipse ephemeris. Our spectra were calibrated in absolute flux and multi-Gaussian fits were used to resolve and quantify components of the Hα emission line. We measured the radial velocity curve of the white dwarf and determined the semi-amplitude as 25.7 km/s and the systemic radial velocity as 95.1 km/s. We found the spectral continuum was consistent with that of a late F or early G type giant star.