Relation of SiO maser emission to IR radiation in evolved stars based on the MSX observation
نویسنده
چکیده
Based on the space MSX observation in bands A(8μm), C(12μm), D(15μm) and E(21μm), and the ground SiO maser observation of evolved stars by the Nobeyama 45-m telescope in the v=1 and v=2 J=1-0 transitions, the relation between SiO maser emission and mid-IR continuum radiation is analyzed. The relation between SiO maser emission and the IR radiation in the MSX bands A, C, D and E is all clearly correlated. The SiO maser emission can be explained by a radiative pumping mechanism according to its correlation with infrared radiation in the MSX band A. Subject headings: infrared: stars — masers — stars: late-type
منابع مشابه
GHz SiO maser survey of late - type stars in the Inner Galaxy ⋆ , ⋆ ⋆ , ⋆ ⋆ ⋆ , † I . Observational data
We present 86 GHz (v = 1, J = 2 → 1) SiO maser line observations with the IRAM 30-m telescope of a sample of 441 late-type stars in the Inner Galaxy (−4 < l < +30). These stars were selected on basis of their infrared magnitudes and colours from the ISOGAL and MSX catalogues. SiO maser emission was detected in 271 sources, and their line-of-sight velocities indicate that the stars are located i...
متن کامل55 9 v 1 2 7 Ju l 2 00 4 Late - type Giants in the Inner Galaxy
We present 86 GHz (v = 1, J = 2 → 1) SiOmaser line observations with the IRAM 30-m telescope of a sample of 441 late-type stars in the Inner Galaxy (−4 < l < +30). These stars were selected on basis of their infrared magnitudes and colours from the ISOGAL and MSX catalogues. SiO maser emission was detected in 271 sources, and their line-of-sight velocities indicate that the stars are located in...
متن کاملObservations of Stellar Maser Sources with no IRAS Counterpart
We investigated stellar maser sources with no IRAS counterpart at the radio, middle-infrared, and nearinfrared wavelengths. A 43 GHz SiO maser search for 120 2MASS/MSX objects, and 10 OH 1612 MHz sources with no or a very faint MSX counterpart, resulted in 43 SiO detections: one OH 1612 MHz source, 2 near-infrared stars, and 40 MSX sources. Additional near-infrared J-, H-, and K-band observatio...
متن کاملA VLBI polarization study of SiO masers towards VY CMa
Maser emission from the SiO molecule has been widely observed in the nearcircumstellar envelopes of late-type, evolved stars. VLBI images can resolve individual SiO maser spots, providing information about the kinematics and magnetic field in the extended atmospheres of these stars. This poster presents full polarization images of several SiO maser lines towards the supergiant star VY CMa. VY C...
متن کاملJa n 20 03 SiO Maser Survey toward the Inner Galactic Disk : 40 ◦ ≤ l ≤ 70 ◦ and | b | ≤ 10 ◦
We present the results of an SiO maser survey for color-selected IRAS sources in the area 40 < l < 70 and |b| < 10 in the SiO J = 1–0, v = 1 and 2 transitions (∼ 43 GHz). We detected 134 out of 272 observed sources in SiO masers; 127 were new detections. A systematic difference in the detection rates between SiO and OH maser searches was found. Especially, in the color ranges with log(F25/F12) ...
متن کامل