V1294 Aql = HD 184279: A bad boy among Be stars or an important clue to the Be phenomenon?

Abstract

A reliable determination of the basic physical properties and variability patterns of hot emission-line stars is important for understanding the Be phenomenon and ultimately, the evolutionary stage of Be stars. This study is devoted to one of the most remarkable Be stars, V1294 Aql = HD 184279. We collected and analysed spectroscopic and photometric observations covering a time interval of about 25000 d (68 yr). We present evidence that the object is a single-line 192.9 d spectroscopic binary and estimate that the secondary probably is a hot compact object with a mass of about 1.1-1.2 solar masses. We found and documented very complicated orbital and long-term spectral, light, and colour variations, which must arise from a combination of several distinct variability patterns. Attempts at modelling them are planned for a follow-up study. We place the time behaviour of V1294 Aql into context with variations known for some other systematically studied Be stars and discuss the current ideas about the nature of the Be phenomenon.

15 pages, 15 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (11)

• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• The Detection and Characterization of Be+sdO Binaries from HST/STIS FUV Spectroscopy
• Investigating the lack of main-sequence companions to massive Be stars
• Spectral and spatial imaging of the Be+sdO binary phi Persei
• gamma Cas stars: Normal Be stars with disks impacted by the wind of a helium-star companion?
• Interferometric detections of sdO companions orbiting three classical Be stars
• The Be Star 66 Ophiuchi: 60 Years of Disk Evolution
• A Multi-observing-technique Study of the Dynamical Evolution of the Viscous Disk around the Be Star $\omega$ CMa
• Short-term variability and mass loss in Be stars V. Space photometry and ground-based spectroscopy of $\gamma$ Cas
• Short-term variability and mass loss in Be stars VI. Frequency groups in $\gamma$ Cas detected by TESS
• Long-term, orbital, and rapid variations of the Be star V923 Aql = HD 183656

Cited by in corpus (2)

• The orbital and physical properties of five southern Be+sdO binary systems
• Newborn Be star systems observed shortly after mass transfer