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astro-ph2005
Three-micron spectra of AGB stars and supergiants in nearby galaxies
M. Matsuura, A. A. Zijlstra, J. Th. van Loon +7
The dependence of stellar molecular bands on the metallicity is studied using infrared L-band spectra of AGB stars (both carbon-rich and oxygen-rich) and M-type supergiants in the…
astro-ph2004
Period and chemical evolution of SC stars
Albert A. Zijlstra, T. R. Bedding, Andrew J. Markwick +8
The SC and CS stars are thermal-pulsing AGB stars with C/O ratio close to unity. Within this small group, the Mira variable BH Cru recently evolved from spectral type SC (showing Z…