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Title: Correlation between SiO v = 3 J = 1 → 0 maser excitation and the light curve of a long-period variable star
Authors: Oyadomari, M.
Imai, H.
Nagayama, T.
Oyama, T.
Matsumoto, N.
Nakashima, J. -I.
Cho, S. -H.
Issue Date: 2018
Publisher: Oxford University Press
Citation: Correlation between SiO v = 3 J = 1 → 0 maser excitation and the light curve of a long-period variable star / M. Oyadomari, H. Imai, T. Nagayama, et al. — DOI 10.1093/pasj/psy021 // Publications of the Astronomical Society of Japan. — 2018. — Vol. 70. — Iss. 3. — 33.
Abstract: In order to understand the excitation mechanisms of silicon monoxide (SiO) masers around long-period variables (LPVs), we have investigated distributions of the SiO v = 2 and v = 3 J = 1 → 0 masers around 12 LPVs by very long baseline interferometry (VLBI) observations with the VLBI Exploration of Radio Astrometry (VERA) and the Nobeyama 45 m telescopes. VLBI fringes of the v = 3 maser emission were detected for five LPVs. The composite maps of the v = 2 and v = 3 masers were made for T Cep, W Hya, WX Psc, and R Leo using the spectral line phase-referencing technique. The v = 2 maser spots were distributed in a ring-like form around the central stars, while it is difficult to recognize any specific morphology in the v = 3 maser distributions due to the small number of v = 3 spots detected. However in T Cep, we find that the distribution of the v = 3 maser spots correlates well with the v = 2 masers within a few milliarcseconds (0.2-0.3 au) in position and 1 km s-1 in line-of-sight velocity at the light curve phase of θ = 0.28 (θ = 0.0 and 1.0 correspond to the visible light maxima). This correlation implies that the mechanism of line-overlapping between the mid-infrared lines of H2O and SiO molecules works in T Cep at θ = 0.28. We discuss the possibility that the line-overlapping may work at the limited duration from the maximum to the minimum of the stellar light curve. © 2018 The Author(s).
Keywords: MASERS
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85051086432
PURE ID: 7667421
ISSN: 46264
DOI: 10.1093/pasj/psy021
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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