Triplet Structure of the H_2O Spectra in S255

Details Triplet Structure of the H_2O Spectra in S255 Triplet Structure of the H_2O Spectra in S255

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003astl...29...26p&link_type=abstract

Astronomy Letters, vol. 29, p. 26-30 (2003)

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We analyzed the monitoring data for the maser S255 obtained in the H_2O line at lambda = 1.35 cm with the 22-m radio telescope at the Pushchino Radio Astronomy Observatory in 1981-2002. The maser was most active during 1998-2002. Since 2001, the H_2O spectra have been extended and complex; their triplet structure has been disrupted. The extent of the spectra was 24 km/s (from -6 to 18 km/s). We calculated orbital parameters for some of the components. We estimated the mass of the central star to be (6-7) M_solar and the outer Keplerian-disk radius to be ~160 AU.

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