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논문

전체
Eight-year Simultaneous Monitoring Observations of H2O and SiO Masers toward V627 Cas
  • 양하늘; 조세형; 윤영주; 외
  • 2021-03-10
  • ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 253 1 : 26-1~26-21
Simultaneous monitoring observations of H2O 61,6 ? 52,3 and SiO v = 1, 2, J = 1 → 0, v = 1, J = 2 → 1, = 3 → 2 masers were performed toward the suspected D-type symbiotic star V627 Cas from 2011 October to 020 March using the Korean Very Long Baseline Interferometry (VLBI) Network (KVN) single-dish telescopes. ll spectra of the H2O masers showed highly redshifted emissions with respect to the stellar velocity of 52 km s?1 with high asymmetries. In addition, the spectra of the H2O maser showed three components which aried according to observational dates. On the other hand, the SiO v = 1, 2, J = 1 → 0 and v = 1, J = 2 → 1 asers exhibited a predominantly blueshifted emission in most epochs. The SiO v = 1, J = 3 → 2 maser has risen around the stellar velocity from 2016 November 19 and shows a predominantly redshifted emission from 018 June 15. We analyze time variations of the H2O and SiO maser intensities, their intensity ratios, peak and ean velocities, and full width zero power. Based on these analyses, the asymmetries of the H2O and SiO masers’ pectra in V627 Cas and the variation characteristics of the maser properties of the different maser lines are discussed. As a possible cause of asymmetries, the influence of a hot component located at the eastern part of the red giant can be suggested based on the KVN VLBI results. The differences in the variation characteristics of the maser properties may originate from the differences in their locations and excitation conditions.