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Angular Size Measurements of Carbon Miras and S-Type Stars

1997; Institute of Physics; Volume: 114; Linguagem: Inglês

10.1086/118635

1538-3881

Gerald van Belle, H. M. Dyck, R. R. Thompson, J. A. Benson, Sheila J. Kannappan,

Astronomy and Astrophysical Research

In our continuing investigation of highly evolved stars, we report new interferometric angular diameter observations of 5 carbon and 4 S-type Mira variable stars, and 4 non-Mira S stars. From the data, effective temperatures and linear radii are calculated. We compare the values of these parameters obtained for stars discussed in this paper with the same parameters for oxygen-rich giants/supergiants, oxygen-rich Mira variables, and non-Mira carbon stars presented in Dyck et al. (l996a, AJ, 111, 1705), van Belle et al. (1996, AJ, 112, 2147), and Dyck et al. (l996b, AJ, 112, 294), respectively. There are two principal findings from a synthesis of these studies. First, the non-Mira variables of each chemical class are consistently hotter and smaller than their Mira-variable counterparts. Second, the S stars lie between the oxygen-rich and the carbon-rich stars in both effective temperature and linear radius, for both the Mira-type and non-Mira stars.