SiO MASERS IN ASYMMETRIC MIRAS. IV. {chi} CYGNI, R AQUILAE, R LEO MINORIS, RU HERCULIS, U HERCULIS, AND U ORIONIS

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/188/2/506· OSTI ID:21455240

Cotton, W D ^[1]; Ragland, S ^[2]; Pluzhnik, E A ^[3]; Danchi, W C ^[4]; Traub, W A ^[5]; Willson, L A ^[6]

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1. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States)
2. W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743 (United States)
3. NASA-Ames Research Center, Moffett Field, CA 94035 (United States)
4. NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt, MD 20771 (United States)
5. Jet Propulsion Laboratory, California Institute of Technology, M/S 301-451, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States)
6. Department of Physics and Astronomy, Iowa State University, Ames, IA 50014 (United States)

This is the fourth paper in a series of multi-epoch observations at 7 mm wavelength of the SiO masers in several asymptotic giant branch stars from a sample of Mira variable stars showing evidence of asymmetric structure in the infrared. These stars have been observed interferometrically in the infrared by IOTA and with VLBA measurements of the SiO masers. In this paper, we present the observations of {chi} Cygni ({chi} Cyg), R Aquilae (R Aql), R Leo Minoris (R LMi), RU Herculis (RU Her), U Herculis (U Her), and U Orionis (U Ori). Several radial features with velocity gradients were observed, all with velocities close to systemic furthest from the star and redshifted closer to the stellar surface. Systemic velocities are estimated for several of the stars. No compelling evidence of asymmetry is seen in the maser distributions. All maser rings are approximately twice the near-IR uniform disk diameter and are comparable in size to the extended molecular envelope when such measurements are available.

• OSTI ID: 21455240
• Journal Information: Astrophysical Journal, Supplement Series, Vol. 188, Issue 2; Other Information: DOI: 10.1088/0067-0049/188/2/506; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASYMMETRY
MASERS
SILICON OXIDES
STELLAR ATMOSPHERES
VARIABLE STARS
AMPLIFIERS
ATMOSPHERES
CHALCOGENIDES
ELECTRONIC EQUIPMENT
EQUIPMENT
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
STARS