A bipolar structure and shocks surrounding the stellar-merger remnant V1309 Scorpii

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Table 4

Calculated optical depths of CO,²⁸SiO, and ²⁹SiO.

Property	CO	²⁸ SiO	²⁹SiO
Frequency (GHz)	345.796	347.330	342.979
Column density (cm⁻²)	1.20×10¹⁹	2.35×10¹⁷	1.20×10¹⁶
FWHM/2 (km s⁻¹)	100	55.95	55.95
τ	8.30	5.94	3.44

Notes. Excitation temperatures were measured as the peak brightness temperature of the spectral feature. The values used for both isotopo-logues of SiO, such as temperature and partition function, are the same, with only column density varying between the calculations.

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