Asymmetric distributions of H2O and SiO masers towards V627 Cas
| Autor: | Sung-Chul Yoon, Richard Dodson, Dong-Hwan Yoon, Maria Rioja, Youngjoo Yun, Dong-Jin Kim, Haneul Yang, Hyosun Kim, Se-Hyung Cho, Hiroshi Imai |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
0303 health sciences Red giant FOS: Physical sciences White dwarf Astronomy and Astrophysics Radius Astrophysics Ring (chemistry) Astrophysics - Astrophysics of Galaxies 01 natural sciences law.invention 03 medical and health sciences Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science law Symbiotic star Astrophysics of Galaxies (astro-ph.GA) Bipolar outflow 0103 physical sciences Very-long-baseline interferometry Maser 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 030304 developmental biology |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 495:1284-1290 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | 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. 7 pages, 4 figures, 1 table, Published in MNRAS |
| Databáze: | OpenAIRE |
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