TY - JOUR
T1 - Asymmetric distributions of H2O and SiO masers towards V627 Cas
AU - Yang, Haneul
AU - Cho, Se Hyung
AU - Yun, Youngjoo
AU - Yoon, Dong Hwan
AU - Kim, Dong Jin
AU - Kim, Hyosun
AU - Yoon, Sung Chul
AU - Dodson, Richard
AU - Rioja, María J.
AU - Imai, Hiroshi
PY - 2020
Y1 - 2020
N2 - We performed simultaneous observations of the H2O 61,6 - 52,3 (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 (∼4 au) of red giants yields the distance of V627 Cas to be ∼1 kpc.
AB - We performed simultaneous observations of the H2O 61,6 - 52,3 (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 (∼4 au) of red giants yields the distance of V627 Cas to be ∼1 kpc.
KW - Binaries: symbiotic
KW - Circumstellar matter
KW - Masers
KW - Radio lines: stars
UR - http://www.scopus.com/inward/record.url?scp=85091713875&partnerID=8YFLogxK
U2 - 10.1093/MNRAS/STAA1206
DO - 10.1093/MNRAS/STAA1206
M3 - Article
AN - SCOPUS:85091713875
VL - 495
SP - 1284
EP - 1290
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -