SiO, ^29^SiO, and ^30^SiO emission from 67 oxygen-rich stars a survey of 61 maser lines from 7 to 1 mm. (2021)
Keywords :
Silicon monoxide masers; Asymptotic giant branch; Interstellar medium Interstellar molecules; Circumstellar envelopes; Stellar evolution Surveys; Radio astronomy
Abstract:Circumstellar environments of oxygen-rich stars are among the strongest SiO maser emitters. Physical processes such as collisions, infrared pumping, and overlaps favor the inversion of level population and produce maser emission at different vibrational states. Despite numerous observational and theoretical efforts, we still do not have a unified picture including all of the physical processes involved in SiO maser emission. The aim of this work is to provide homogeneous data in a large sample of oxygen-rich stars. We present a survey of 67 oxygen-rich stars from 7 to 1mm, in their rotational transitions from J=1-0 to J=5-4, for vibrational numbers v from 0 to 6 in the three main SiO isotopologs. We have used one of the 34 m NASA antennas
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We have done a survey of 67 oxygen-rich evolved stars in their SiO,
^29^SiO, and ^30^SiO maser line emission. The DSS-54 antenna of the
Madrid Deep Space Communications Complex (MDSCC) was used in the first
part of the survey to observe the J=1->0 lines, at a wavelength of 7mm
(~43GHz). Based on these initial results, we observed the most
relevant sources in the J=2->1 to 5->4, at wavelengths of 3, 2, and
1mm, using the 30m IRAM radio telescope at Pico Veleta (Spain). The
MDSCC observations were done between 2012 March and July, and the IRAM
observations in 2012 August.
Ricardo Rizzo Ricardo Rizzo <ricardo.rizzo _at_ cab.inta-csic.es> The CDS also acknowledges Ka Tat Wong (IRAM) for spotting the error on the sequence number in Table 4.
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