SiO Maser Emission and the Intrinsic Properties of Mira Variables

Patel, Nimesh A and Joseph, Antony and Ganesan, R (1992) SiO Maser Emission and the Intrinsic Properties of Mira Variables. In: Journal of Astrophysics & Astronomy, 13 (3). pp. 241-265.

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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.

Item Type:	Journal Article
Publication:	Journal of Astrophysics & Astronomy
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	Stars;SiO masers;stars;long period variables;star;slate type;masers;SiO;radio lines;molecular.
Department/Centre:	Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited:	30 May 2011 08:59
Last Modified:	30 May 2011 08:59
URI:	http://eprints.iisc.ac.in/id/eprint/37605

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