The circumstellar H2O maser emission associated with four late-type stars

Details The circumstellar H2O maser emission associated with four late-type stars The circumstellar H2O maser emission associated with four late-type stars

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..660j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 660-670.

Astronomy and Astrophysics

Astronomy

40

Interstellar Masers, Late Stars, Radio Astronomy, Stellar Envelopes, Stellar Radiation, Water Masers, Extragalactic Radio Sources, High Resolution, Molecular Spectra, Radial Velocity, Very Long Base Interferometry

Scientific paper

The positions and structure of H2O maser associated with four long-period stars were measured using the VLA, and the results are discussed. The four stars observed were: RX Boo; R Aq1; RR Aq1; and NML Cyg. The spatial resolution of the VLA measurements was 0.07 arcsec. The H2O maser emission features appear as unresolved knots distributed over an area of no more than 0.4 arcsec. The velocity and spatial characteristics of the maser regions in R Aq1 and RR Aq1 were found to change considerably over time. The estimated sizes of the H2O maser emission were 8 x 10 to the 14th for RX Boo, R Aq1, and RR Aq1. The supergiant star NML Cyg had the largest maser region (10 to the 16th) which is comparable to that of VY CMa. The positional accuracy for individual maser features ranged between 0.03 and 0.09 arcsec. However, the precise location of the maser emission relative to the stellar photocenter did not fit the velocity and spatial distributions of the emission and therefore may be inappropriate as a standard for comparisons of stellar reference frames.

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