论文标题
H2O和SIO MASERS对V627 CAS的不对称分布
Asymmetric distributions of H2O and SiO masers towards V627 Cas
论文作者
论文摘要
我们对H2O 6（1,6） - 5（2,3）（22.235080 GHz）和SIO v = 1，2，j = 1-0，sio v = 1，j = 2-1，3-2（43.122080，42.820587，42.820587，86.24442，42.820587，42.820593359359359359359359359359359359359359359359359359359359359359359359359333333333333333333. D型共生星V627 CAS，使用韩国VLBI网络。 Here, we present astrometrically registered maps of the H2O and SiO v = 1, 2, J = 1 - 0, SiO v = 1, J = 2 - 1 masers for five epochs from January 2016 to June 2018. Distributions of the SiO maser spots do not show clear ring-like structures, and those of the H2O maser are biased towards the north-north-west to west with respect to the SiO maser features according to observational时代。根据两种双极流出的情况，讨论了H2O和SIO MASERS的这些不对称分布，以及在V627 Cas中的热伴侣（白色矮人）的存在。我们进行了SIO V = 1的环拟合，并进行了V = 2个masers，并估计了凉爽的红色巨人的预期位置。如前所述，SIO V = 1 maser的环半径比Sio V = 2 Maser的环半径略大。我们对V627 Cas的Sio Maser环的物理大小的假设是红色巨人的Sio Maser环半径（\ sim4 au）的典型大小，可产生v627 Cas的距离为\ sim1 kpc。
We performed simultaneous observations of the H2O 6(1,6) - 5(2,3) (22.235080 GHz) and SiO v= 1, 2, J = 1 - 0, SiO v = 1, J = 2 - 1, 3 - 2 (43.122080, 42.820587, 86.243442, and 129.363359 GHz) masers towards the suspected D-type symbiotic star, V627 Cas, using the Korean VLBI Network. Here, we present astrometrically registered maps of the H2O and SiO v = 1, 2, J = 1 - 0, SiO v = 1, J = 2 - 1 masers for five epochs from January 2016 to June 2018. Distributions of the SiO maser spots do not show clear ring-like structures, and those of the H2O maser are biased towards the north-north-west to west with respect to the SiO maser features according to observational epochs. These asymmetric distributions of H2O and SiO masers are discussed based on two scenarios of a bipolar outflow and the presence of the hot companion, a white dwarf, in V627 Cas. We carried out ring fitting of SiO v = 1, and v = 2 masers and estimated the expected position of the cool red giant. The ring radii of the SiO v = 1 maser are slightly larger than those of the SiO v = 2 maser, as previously known. Our assumption for the physical size of the SiO maser ring of V627 Cas to be the typical size of a SiO maser ring radius (\sim4 au) of red giants yields the distance of V627 Cas to be \sim1 kpc.
