Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..259i&link_type=abstract
Publications of the Astronomical Society of Japan, vol.53, no. 2, p. 259-273.
Astronomy and Astrophysics
Astronomy
2
Astrometry, Masers, Stars: Late-Type, Techniques: Interferometric
Scientific paper
We have made snapshot VLBI observations of SiO masers of the J=1-0 transition at two vibrational levels v=1 and v=2 using the Kashima-Nobeyama Interferometer (KNIFE). Out of 37 sources observed, we detected both of the lines from 16 sources with a typical detection limit of 10 Jy. Most of the SiO masers were significantly spatially resolved with a KNIFE baseline (200 km), indicating extended/complicated structures of the SiO masers with a typical angular size of a few milliarcseconds. Similar fringe-phase profiles along a radial velocity spanning larger than 1.0km s-1 between the two lines indicate a similar spatial structure along the velocity spacings. This tendency, shown from 13 SiO maser sources except Orion KL, supports spatial coincidence of the two lines found previously for M-type stars VY CMa and W Hya. The spatial coincidence should enable us to measure group-delays of the SiO masers for stellar astrometry.
Fujisawa Kenta
Imai Hiroshi
Iwata Takahiro
Kameno Seiji
Kataguchi Noriyuki
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