# VLBA SiO observations of bright O-rich AGB stars

@article{Cotton2008VLBASO,
title={VLBA SiO observations of bright O-rich AGB stars},
author={William D. Cotton and Guy Perrin and Beatriz Lopez},
journal={Astronomy and Astrophysics},
year={2008},
volume={477},
pages={853-863}
}
• Published 2008
• Physics
• Astronomy and Astrophysics
We present the results of observations of the SiO masers at 7 mm wavelength in several oxygen rich Asymptotic Giant Branch (AGB) stars. These observations were coordinated with observations using the ESO VLTI/MIDI interferometer at 10 μm wavelength. These stars are o Ceti (Mira), U Herculis (U Her), OH26.5+0.6, R Leonis (R Leo), and W Hydrae (W Hya). Both total intensity and linear polarizations are imaged. Linear radial features seen in o Ceti may be associated with an X-ray flare seen a year…

## Figures and Tables from this paper

SIO Masers in Asymmetric Miras. I. R Leonis
• Physics
• 2009
This is the first paper in a series of multi-epoch observations of the SiO masers at 7 mm wavelength in several asymptotic giant branch (AGB) stars. This is a sample of Mira variable stars showing
VLBA SiO maser observations of the OH/IR star OH 44.8-2.3: magnetic field and morphology
• Physics
• 2012
Context. SiO maser emission occurs in the extended atmosphere of evolved stars and can be studied at high angular resolution. As compact, high-brightness components they can be used as important
SiO MASERS IN ASYMMETRIC MIRAS. IV. χ CYGNI, R AQUILAE, R LEO MINORIS, RU HERCULIS, U HERCULIS, AND U ORIONIS
• Physics
• 2010
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
The mid-infrared diameter of W Hydrae ,
• Physics
• 2011
Aims. Asymptotic giant branch (AGB) stars are among the largest distributors of dust into the interstellar medium, and it is therefore important to understand the dust formation process and sequence
Magnetic Fields in Evolved Stars: Imaging the Polarized Emission of High-frequency SiO Masers
• Physics, Geology
• 2011
We present Submillimeter Array observations of high-frequency SiO masers around the supergiant VX Sgr and the semi-regular variable star W Hya. The J = 5-4, v = 128SiO and v = 029SiO masers of VX Sgr
SiO MASERS IN ASYMMETRIC MIRAS. III. IK TAURI
• Physics
• 2010
This is the third 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
SiO maser astrometry of the red transient V838 Monocerotis
• Physics
Astronomy & Astrophysics
• 2020
We present multiepoch observations with the Very Long Baseline Array of SiO maser emission in the v = 1, J = 1−0 transition at 43 GHz from the remnant of the red nova V838 Mon. We modeled the
Variable Asymmetry of the Circumstellar Envelope in IK Tauri Traced by SiO Maser Emission
• Physics
• 2008
We observed the SiO (v = 1 and v = 2, J = 1–0) maser emissions toward the Mira variable IK Tauri (IK Tau, NML Tau, IRC +10050) over nine epochs from 2003 November to 2005 April using the VLBI
SiO MASERS IN ASYMMETRIC MIRAS. II. R CANCRI
• Physics
• 2009
This is the second paper in a series of multi-epoch observations of the SiO masers at 7 mm wavelength in several asymptotic giant branch stars from a sample of Mira variable stars showing evidence of
Relative Astrometry of the J = 1→0, v = 1 and v = 2 SiO masers toward R leonis minoris using VERA
• Physics
• 2008
Oxygen-rich Asymptotic Giant Branch (AGB) stars are intense emitters of SiO and H2O maser lines at 43 (J = 1!0, v = 1 and 2) and 22 GHz, respectively. VLBI observations of the maser emission provide

## References

SHOWING 1-10 OF 39 REFERENCES
Further VLBA observations of Sio masers toward Mira variable stars
• Physics
• 2006
We present the results of continued monitoring of the SiO masers at 7 mm wavelength in several of the Mira variable stars reported in Cotton et al. (2004, A&A, 414, 275) (o Ceti = Mira, U Orionis = U
VLBA observations of SiO masers towards Mira variable stars
• Physics
• 2004
We present new total intensity and linear polarization VLBA observations of the ν = 2a ndν = 1 J = 1−0 maser transitions of SiO at 42.8 and 43.1 GHz in a number of Mira variable stars over a
EVIDENCE FOR VERY EXTENDED GASEOUS LAYERS AROUND O-RICH MIRA VARIABLES AND M GIANTS
• Physics
• 2002
Nine bright O-rich Mira stars and five semiregular variable cool M giants have been observed with the Infrared and Optical Telescope Array (IOTA) interferometer in both K 0 (� 2.15 lm) and L 0 (� 3.8
Characterization of Dust Shell Dynamics and Asymmetry for Six Mira-Type Stars
• Physics
• 2006
Interferometric observations of six Mira-type stars: R Aqr, CIT 3, χ Cyg, W Aql, R Leo, and U Ori are reported. All measurements were made by UC Berkeley's Infrared Spatial Interferometer (ISI),
The mid-IR spatially resolved environment of OH 26.5+0.6 at maximum luminosity
• Physics
• 2005
We present observations of the famous OH/IR star OH 26.5+0.6 obtained using the Mid-Infrared Interferometric Instrument MIDI at the European Southern Observatory (ESO) Very Large Telescope
Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared
• Physics
• 2004
We present K-band commissioning observations of the Mira star prototype o Cet obtained at the ESO Very Large Telescope Interferometer (VLTI) with the VINCI instrument and two siderostats. The
Radio Photospheres of Long-Period Variable Stars
• Physics
• 1997
We report the detection of centimeter-wavelength emission from a sample of nearby long-period (Mira and semiregular) variables using the VLA. Six of the eight stars in the sample were detected. We
The magnetic field around late-type stars revealed by the circumstellar H2O masers
• Physics, Geology
• 2005
Through polarization observations, circumstellar masers are excellent probes of the magnetic field in the envelopes of late-type stars. Whereas observations of the polarization of the SiO masers
Are dust shell models well-suited to explain interferometric data of late-type stars in the near-infrared?
• Physics
• 2004
Recently available near-infrared interferometric data on late-type stars show a strong increase of diameter for asymptotic giant branch (AGB) stars between the K ($2.0{-}2.4~{\rm \mu m}$) and L
Full polarization study of SiO masers at 86 GHz
• Physics
• 2006
Aims. We study the polarization of the SiO maser emission in a representative sample of evolved stars in order to derive an estimate of the strength of the magnetic field, and thus determine the