AbstractWe performed simultaneous monitoring observations of H2O 616-523 and SiO v = 1, 2, [FORMULA OMISSION] 0, SiO v = 1, [FORMULA OMISSION] 1, [FORMULA OMISSION] maser lines toward the symbiotic star CH Cyg from 2012 December to 2019 November using the Korean very long baseline interferometry Net...
AbstractWe performed simultaneous monitoring observations of H2O 616-523 and SiO v = 1, 2, [FORMULA OMISSION] 0, SiO v = 1, [FORMULA OMISSION] 1, [FORMULA OMISSION] maser lines toward the symbiotic star CH Cyg from 2012 December to 2019 November using the Korean very long baseline interferometry Network single-dish telescope. SiO v = 1, 2, [FORMULA OMISSION] and v = 1, [FORMULA OMISSION] maser lines were detected for the first time. A periodicity of about 2.5 yr in the SiO maser intensity was found, showing its association with the pulsation of the M giant in CH Cyg. Only the SiO v = 2, [FORMULA OMISSION] maser, without detections of the v = 1, [FORMULA OMISSION] maser, was detected in 6 epochs out of 15 v = 2, J = 1-0 maser detected epochs. In addition, the SiO v = 1, [FORMULA OMISSION] maser intensity was always stronger than that of the v = 1, [FORMULA OMISSION] maser except for one epoch, providing a critical constraint on the different masing conditions by different transitions, according to changes of the CH Cyg symbiotic system. We also found the gradual redshifted peak velocities of the SiO masers had about a 2.5 yr periodicity corresponding to the period of peak intensities (redshifted up to about [FORMULA OMISSION] with respect to the stellar velocity of the M giant). Two possible explanations can be suggested for the 2.5 yr period of the SiO maser intensity and velocity behaviors, although their actual causes remain uncertain.
AbstractWe performed simultaneous monitoring observations of H2O 616-523 and SiO v = 1, 2, [FORMULA OMISSION] 0, SiO v = 1, [FORMULA OMISSION] 1, [FORMULA OMISSION] maser lines toward the symbiotic star CH Cyg from 2012 December to 2019 November using the Korean very long baseline interferometry Network single-dish telescope. SiO v = 1, 2, [FORMULA OMISSION] and v = 1, [FORMULA OMISSION] maser lines were detected for the first time. A periodicity of about 2.5 yr in the SiO maser intensity was found, showing its association with the pulsation of the M giant in CH Cyg. Only the SiO v = 2, [FORMULA OMISSION] maser, without detections of the v = 1, [FORMULA OMISSION] maser, was detected in 6 epochs out of 15 v = 2, J = 1-0 maser detected epochs. In addition, the SiO v = 1, [FORMULA OMISSION] maser intensity was always stronger than that of the v = 1, [FORMULA OMISSION] maser except for one epoch, providing a critical constraint on the different masing conditions by different transitions, according to changes of the CH Cyg symbiotic system. We also found the gradual redshifted peak velocities of the SiO masers had about a 2.5 yr periodicity corresponding to the period of peak intensities (redshifted up to about [FORMULA OMISSION] with respect to the stellar velocity of the M giant). Two possible explanations can be suggested for the 2.5 yr period of the SiO maser intensity and velocity behaviors, although their actual causes remain uncertain.
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