Water maser variability and disk structure in S 255

Details Water maser variability and disk structure in S 255 Water maser variability and disk structure in S 255

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..513c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 2, July 1990, p. 513-522.

Astronomy and Astrophysics

Astrophysics

35

Accretion Disks, Star Formation, Water Masers, Computer Programs, Kepler Laws, Radiative Transfer, Stellar Spectra

Scientific paper

The 22 GHz H2O maser emission from 5 sources associated with regions of star formation and showing triple peak profiles has been observed by means of the 32 m antenna of Medicina (Italy). One of these sources (S 255) has been monitored for about 2 years. The acquired spectra show an anticorrelated variability of the two side lines on time scales of a few months. This phenomenon is interpreted in terms of a disk in Keplerian rotation seen edge on. In order to quantify both the spectrum profile and its peculiar variations the radiative transfer equation in the disk is numerically solved, and the computed spectra compared with the observed ones. The H2O maser is demonstrated to be saturated and radiatively pumped.

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