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      https://www.ias.ac.in/article/fulltext/joaa/013/03/0241-0265

    • Keywords

       

      stars; SiO masers; stars-long period variables; star-slate type; masers-SiO; radio lines-molecular

    • Abstract

       

      This paper presents observations of SiO maser emission from 161 Mira variables distributed over a wide range of intrinsic parameters like spectral type, bolometric magnitude and amplitude of pulsation. The observations were made at 86.243 GHz, using the 10-4 m millimeter-wave telescope of the Raman Research Institute at Bangalore, India. These are the first observations made using this telescope. From these observations, we have established that the maser emission is restricted to Miras having mean spectral types between M6 and M10. The infrared period-luminosity relation for Mira variables is used to calculate their distances and hence estimate their maser luminosities from the observed fluxes. The maser luminosity is found to be correlated with the bolometric magnitude of the Mira variable. On an H-R diagram, the masing Mira variables are shown to lie in a region distinct from that for the non-masing ones.

    • Author Affiliations

       

      Nimesh A. Patel1 2 3 Antony Joseph1 R. Ganesan1

      1. Raman Research Institute, Bangalore - 560 080
      2. Astronomy Programme, Indian Institute of Science, Bangalore - 560 012
      3. Five College Radio Astronomy Observatory, University of Massachusetts, Amherst, Massachusetts - 01033, USA
    • Dates

       
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