Observation of possible mode switching in three semiregular variable stars

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115746· OSTI ID:5702487

Cadmus, Jr, R R; Willson, L A; Sneden, C; Mattei, J A ^[1]

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1. Grinnell College, IA (USA) Iowa State Univ. of Science and Technology, Ames (USA) Texas Univ., Austin (USA) American Association of Variable Star Observers, Cambridge, MA (USA)

Both the amplitude and period of the light variations of the semiregular long-period variables RV And, S Aql, and U Boo dramaticaly decreased, and then suddenly increased, in recent years. These observations, in conjunction with spectroscopic data, suggest that these stars may have switched from fundamental to overtone pulsation and back again. Theoretical models are consistent with both the photometric and spectroscopic observations. The similarity between the longer-period oscillations of these stars and the behavior of Mira variables supports the conclusion that the Miras are fundamental-mode pulsators. 14 refs.

• OSTI ID: 5702487
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRONIC EQUIPMENT
EQUIPMENT
HARMONIC OSCILLATORS
MATHEMATICAL MODELS
OSCILLATIONS
OSCILLATORS
PHOTOMETRY
PULSATIONS
SPECTROSCOPY
STAR MODELS
STARS
STELLAR RADIATION
VARIABLE STARS
VARIATIONS