Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..727s&link_type=abstract
Astronomy and Astrophysics, v.296, p.727
Astronomy and Astrophysics
Astrophysics
21
Masers, Stars: Agb, Post-Agb, Stars: Mass-Loss, Surveys
Scientific paper
107 semiregular variables of spectral type M have been observed in the H_2_O 6_16_-5_23_ line at 22.235GHz with the 100m Effelsberg radio telescope and maser emission has been detected in 23 objects, of which 10 are new detections. The maser semiregulars show redder infrared colours than similar non-maser semiregulars. The H_2_O masers are usually associated with semiregulars of late spectral types and substantial mass loss rates. A great variety of H_2_O maser spectra from single through double-peaked to complex profiles is observed, showing strong variations in the profiles and in the relative intensities of separate features. Generally, emission from the blue part of the velocity interval is stronger than emission from the red part. The H_2_O outflow velocities range from 20 to 80% of the terminal expansion velocities. A wide range of H_2_O luminosities (L_H_2_O_=0.6x10^40^-6x10^43^s^-1^) is observed but on average the H_2_O luminosity of semiregular stars is lower than that of Miras. A correlation between the H_2_O maser luminosity and mass loss rate seems to exist, which extends a similar relationship found among Miras and OH/IR stars towards smaller mass loss rates.
Engels Dieter
Szymczak Marian
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