1997A&A...319L...1I


Query : 1997A&A...319L...1I

1997A&A...319L...1I - Astronomy and Astrophysics, volume 319, L1-4 (1997/3-3)

Measurement of shifts in line-of-sight velocities of stellar water masers using VLBI.

IMAI H., SHIBATA K.M., SASAO T., MIYOSHI M., KAMEYA O., OMODAKA T., MORIMOTO M., IWATA T., SUZUYAMA T., MOCHIZUKI N., MIYAJI T. and TAKEUTI M.

Abstract (from CDS):

We performed VLBI monitoring observations of water masers around a semiregular variable RT Vir and detected for the first time systematic shifts of line-of-sight velocities in time for several spatially distinguished water maser spots. In some strong water maser spots, the line-of-sight velocities linearly increased or decreased through successive observing sessions during four months. The rates of the velocity shifts ranged from -3.55 to 1.76km/s/yr. We also noted that the blue-shifted and red-shifted maser components with respect to the stellar velocity are clearly separated in the celestial plane. If mass-loss process of the evolved star is described with simple kinematic models like bipolar flow or rotation disk, we should find one-to-one correspondence between acceleration/deceleration and blue-shift/red-shift of the maser spots. However, we did not find such a clear correspondence. The fact is likely to imply the more complicated nature of the real mass-loss process of the evolved star.

Abstract Copyright:

Journal keyword(s): Masers - stars: late-type - stars: mass-loss

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* RT Vir AB* 13 02 37.9814644272 +05 11 08.362884984 10.07 9.07 7.41     M8III 306 0
2 V* R Aql OH* 19 06 22.2510922392 +08 13 48.012661776 8.06 7.69 6.09     M6.5-9e 547 0

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2022.05.16-16:12:26

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