LONG-PERIOD RADIAL-VELOCITY VARIATIONS OF ARCTURUS

High-precision radial velocities of Arcturus measured on 43 occasions from 1981 through 1985 show a 500 m s⁻¹ range. This range is much larger than the external errors of our observations (typically 13 m s⁻¹) confirming the radial-velocity variability of Arcturus that has been previously reported by...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 1989-02, Vol.101 (636), p.147-159
Hauptverfasser: IRWIN, ALAN W., CAMPBELL, BRUCE, MORBEY, CHRISTOPHER L., WALKER, G. A. H., YANG, S.
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container_end_page 159
container_issue 636
container_start_page 147
container_title Publications of the Astronomical Society of the Pacific
container_volume 101
creator IRWIN, ALAN W.
CAMPBELL, BRUCE
MORBEY, CHRISTOPHER L.
WALKER, G. A. H.
YANG, S.
description High-precision radial velocities of Arcturus measured on 43 occasions from 1981 through 1985 show a 500 m s⁻¹ range. This range is much larger than the external errors of our observations (typically 13 m s⁻¹) confirming the radial-velocity variability of Arcturus that has been previously reported by our group and others based on shorter observational time spans. Using a nonlinear least-squares technique, we have determined a number of multiperiodic models which give a good representation of our velocities simultaneously with those of Smith, McMillan, and Merline (1987).The small-amplitude short-period components of these models could represent the Arcturus analog of the solar five-minute oscillations. Confirmation of this interpretation will require additional observations to help sort out the aliasing problems for these components. Regardless of which aliases are chosen to represent the short-period oscillations, our best-fitting models require the period of the largest-amplitude component to be 640 days or longer. A long-period component could be caused by some surface effect such as convective motions or modulation of the radial velocity by rotation. Alternatively, a long-period component could be caused by motion of Arcturus as it orbits with a low-mass companion around their common center of mass.
doi_str_mv 10.1086/132415
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source JSTOR Archive Collection A-Z Listing; Institute of Physics Journals; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Astronomy
Confidence limits
Datasets
Earth, ocean, space
Error rates
Exact sciences and technology
Fictitious names
Figure of merit
Mechanics
Periodicity
Proper motions and radial velocities. Space motions
Radial velocity
Sine waves
Stars
Stellar characteristics and properties
Wave velocity
title LONG-PERIOD RADIAL-VELOCITY VARIATIONS OF ARCTURUS
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