Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..949l&link_type=abstract
Astronomy Reports, Volume 45, Issue 12, December 2001, pp.949-959
Astronomy and Astrophysics
Astronomy
4
Scientific paper
Results of observations of the H2O maser in S269 carried out from October 1980 to February 2001 on the 22-m telescope (RT-22) of the Pushchino Radio Astronomy Observatory are presented. During the monitoring of S269, variability of the integrated flux of the maser emission with a cyclic character and an average period of 5.7 years was observed. This may be connected with cyclic activity of the central star during its formation. Emission at radial velocities of 4 7 km/s was detected. Thus, the H2O maser emission in S269 extends from 4 to 22 km/s, and is concentrated in three radial-velocity intervals: 4 7, 11 14, and 14 22 km/s. In some time intervals, the main group of emission features (14 22 km/s) had a triplet structure. The central velocity of the total spectrum is close to the velocity of the CO molecular cloud and HII region, differing from it by an amount that is within the probable dispersion of the turbulent gas velocities in the core of the CO molecular cloud. A radial-velocity drift of the component at V LSR≈20 km/s with a period of ≈26 years has been detected. This drift is likely due to turbulent (vortical) motions of material.
Berulis I. I.
Lekht E. E.
Pashchenko M. I.
No associations
LandOfFree
Twenty-Year-Long Monitoring of the H2O Maser S269 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Twenty-Year-Long Monitoring of the H2O Maser S269, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Twenty-Year-Long Monitoring of the H2O Maser S269 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1388050