SiO maser emission and the intrinsic properties of Mira variables
نویسندگان
چکیده
منابع مشابه
Explanation of 29 SiO , 30 SiO and high - v 28 SiO maser emission
We have developed a non–local radiative transfer code to study the effects of line overlaps between different molecular species on the emergent line intensities from interstellar and circumstellar clouds. The numerical method solves the transfer of radiation and the statistical equilibrium populations for the different molecules simultaneously, and allows a direct comparison between the intensi...
متن کاملTesting the ‘clump’ model of SiO maser emission
Building on the detection of the J = 7−6 SiO maser emission in both the v = 1 and v = 2 vibrational states towards the symbiotic Mira, R Aquarii, we have used the James Clerk Maxwell Telescope to study the changes in the SiO maser features from R Aqr over a stellar pulsational period. The observations, complemented by contemporaneous data taken at 86GHz, represent a test of the popular thermal-...
متن کاملMapping the circumstellar SiO maser emission in R Leo
Context. The study of the innermost circumstellar layers around AGB stars is crucial to understand how these envelopes are formed and evolve. The SiO maser emission occurs at a few stellar radii from the central star, providing direct information on the stellar pulsation and on the chemical and physical properties of these regions. Our data also shed light on several aspects of the SiO maser pu...
متن کاملFirst VLBI mapping of circumstellar 29 SiO maser emission
We report the first VLBI map of the v=0 J=1–0 maser line of 29 SiO in the long-period variable star IRC +10011. We have found that this maser emission is composed of multiple spots distributed in an incomplete ring, suggesting that this maser is also amplified tangentially, as already proposed in other SiO circumstellar masers. We present also VLBI maps for the 7 mm 28 SiO v=1 and 2 J=1–0 and t...
متن کاملSiO high velocity maser emission in O-rich evolved stars
Highly sensitive simultaneous observations of the 2→1 line of the first vibrationally excited state of SiO, and of the 2→1 line of CO have been obtained toward 37 O-rich evolved stars. In ∼ 45% of these objects, the SiO line profiles present unusually broad wings, reaching, and in some cases exceeding, the terminal velocity of the circumstellar envelope. All of the objects exhibiting SiO line w...
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ژورنال
عنوان ژورنال: Journal of Astrophysics and Astronomy
سال: 1992
ISSN: 0250-6335,0973-7758
DOI: 10.1007/bf02702293