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THE LIGHT CURVE SHAPES AS A KEY TO RESOLVING THE ORIGIN OF LONG SECONDARY PERIODS IN RED GIANT STARS.
- Source :
-
Astrophysical Journal . 6/10/2014, Vol. 788 Issue 1, p1-1. 1p. - Publication Year :
- 2014
-
Abstract
- We present a study of Optical Gravitational Lensing Experiment light curves of red giant stars exhibiting long secondary periods (LSPs)—an enigmatic phenomenon commonly observed in stars on the upper red giant branch and asymptotic giant branch. We show that the light curves of LSP stars are essentially identical to those of the spotted variables with one dark spot on their photospheres. Such behavior can be explained by the presence of a dusty cloud orbiting the red giant together with a low-mass companion in a close, circular orbit. We argue that the binary scenario is in agreement with most of the observational properties of LSP variables, including non-sinusoidal shapes of their radial velocity curves. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LIGHT curves
*ASTRONOMICAL spectroscopy
*BINARY stars
*STARSPOTS
RED giant spectra
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 788
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 96258615
- Full Text :
- https://doi.org/10.1088/0004-637X/788/1/13