Titanium Monoxide (TiO)
Titanium monoxide, TiO, has been known to be present in the atmospheres of cool stars for more than 100 years. We do not in general list or discuss molecular constituents of stellar atmospheres in this Encyclopedia; however, more recent observations show that TiO is also be present in the circumstellar envelopes of some cool stars (Kaminski et al. 2013; see Molecules in Space).
Isotopic anomalies for titanium (differences from typical solar system values for the relative abundances of Ti isotopes) have been found in meteorites and interpreted as possible evidence for the survival of presolar material, possibly interstellar grains or material from a near-by supernova explosion.
The related molecule, titanium dioxide, TiO2, has been identified by radio astronomers in the circumstellar envelope of the evolved star VY Canis Majoris.
References and Further Reading
- Chen JH, Papanastassiou DA, Zhang A, Dauphas N, Davis AM (2012) Correlated Ca, Ti, and Cr isotopic anomalies in meteorites. In: 43rd Lunar Planetary Science Conference, abstract #2607Google Scholar