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- W2011085979 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Behavior of Absorption Features in the Spectra of Mira Variables. Deutsch, A. J. ; Merrill, P. W. ; Keenan, P. C. Abstract Comparison of coude' spectrograms of Mira (Me) variables and of normal red giants has established several regularities in the complex behavior of their absorption spectra: (1) Temperature types of M stars later than about MS can be improved by comparing relative strengths of their molecular bands (TiO and VO) rather than absolute intensities. The reason is that even the vibrational levels of TiO are far enough apart to have appreciably different populations at temperatures of 3000 K and lower. (2) Consistent differences in the ratios of the bands of YO, ScO, and AlO appear to reflect real differences in the abundances of these metals in certain Mira variables. Strengthening of YO and ScO indicates a tendency towards spectral type S; in such stars A tO is often weak. (3) A striking characteristic of the spectra of many Mira variables is the weakness of many absorption lines in comparison to their strength in nonvariable stars of type M. The weakening is most noticeable in the range of types MOe to M5e, while many of the coolest Mira variables (K Leo) can scarcely be distinguished from ordinary giants. The line weakening is most pronounced in the blue and visual regions, and tends to disappear in the ultraviolet below 3900 A. In any one variable the weakening can vary greatly from one cycle to another. The lines least weakening arise from: (a) Ions of elements with ionization potentials less than about 6 ev (Baii, Srii). (b) Low levels of neutral atoms (Fe, Ti, Co) that have higher ionization potentials. The differential behavior of these lines suggests that the Mira variables have atmospheres in which both pressure and temperature are lower than in normal giants of the same spectral type. They differ from supergiants, however, in having weaker lines (higher opacity) and in the absence of pronounced turbulent broadening of lines. The work of one of us (P.C.K.) on the project was supported by a grant to OSUKF from the National Science Foundation. Publication: The Astronomical Journal Pub Date: March 1961 DOI: 10.1086/108507 Bibcode: 1961AJ.....66Q.282D full text sources ADS |" @default.
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- W2011085979 title "Behavior of Absorption Features in the Spectra of Mira Variables." @default.
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