2008A&A...477..853C


Query : 2008A&A...477..853C

2008A&A...477..853C - Astronomy and Astrophysics, volume 477, 853-863 (2008/1-3)

VLBA SiO observations of bright O-rich AGB stars.

COTTON W.D., PERRIN G. and LOPEZ B.

Abstract (from CDS):

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 10µm wavelength. These stars are {omi} 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 {omi} Ceti may be associated with an X-ray flare seen a year earlier by Karovska et al. (2005ApJ...623L.137K). Similar linear features are also seen in R Leo, U Her and OH26.5+0.6. These features typically show systematic radial velocity variations and a tendency for the linear polarization to be perpendicular to the direction of elongation, suggesting that magnetic fields are dynamically important. A wide radial extent of the maser rings observed in U Herculis and OH26.5+0.6 is interpreted as meaning that the outer boundaries of the masing regions in these stars are not truncated by the condensation of SiO onto dust grains.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: AGB and post-AGB - stars: variables: general - radio lines: stars - masers

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO J0217+0144 QSO 02 17 48.9547510 +01 44 49.698899   16.74 16.09 18.51 13.29 ~ 387 1
2 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1468 0
3 V* TX Cam Mi* 05 00 51.1569959503 +56 10 54.093107078       14.02   M9-9.5 337 0
4 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2107 1
5 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 888 1
6 QSO B1334-127 QSO 13 37 39.78277768 -12 57 24.6932620   18.5 18.5 16.22   ~ 447 1
7 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 616 0
8 6C 161147+342017 QSO 16 13 41.0645258703 +34 12 47.911898732   17.98 17.46 17.07   ~ 590 1
9 V* U Her Mi* 16 25 47.4723609675 +18 53 32.862370166 8.85 8.23 6.70     M6.5-8+e 523 1
10 V* RR Sco Mi* 16 56 37.8414071798 -30 34 48.189816056 8.46 7.64 6.10     M6+e 149 0
11 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 852 1
12 OH 26.5 +0.6 OH* 18 37 32.50920 -05 23 59.1936           O-rich 286 0

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2021.09.27-18:44:58

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