Abstract: The authors present new data which will contribute to an analysis of the so-called super-metal-rich K giants. The results include DDO photometry and photomultiplier scanner data; some of the latter reflect blanketing and feature strengths, and the rest bear primarily on stellar temperatures. Some of the scanner data are transformed to the Cousins R-I system and are given with previously published measurements on this system.

Abstract:

Photometry (uvby β) of EH Lib has been secured and analyzed. A small correction is made to the period in order to better predict times of light maxima. A reddening value, E(b — y) = +0ṃ041, is derived from standard calibrations applied to the photometry. Intrinsic (b—y) and c₁ values are used to determine a mean effective temperature, ‹Teff› = 7840 K, and a mean surface gravity, ‹log g› = 4.08. The metal abundance, [Fe/H] = -0.015, is determined from δm₁ Using new and previously published spectroscopie data, a mean radius, ‹R› = 2.4 R⊙, is derived using a Wesselink method. The radius and effective temperature indicate a mean absolute bolometric magnitude, ‹Mbol› = + 1.5. Also a m

Abstract:

Over 700 observations of HD 200925 in the uvby and ß systems have been secured and analyzed. Our data show that this variable is multiperiodic. A reddening value, E(b-y) = 0ṃ029, has been derived from the observations. The reddening-corrected normals for y, (b-y), and c₁ yield a mean effective temperature, ‹Teff›=7020 K, a mean surface gravity, ‹log g›=3.44, and a mean bolometric magnitude, ‹Mbol› = 0ṃ8. We determine a preliminary mean radius, ‹R› = 4.1 R⊙. Our m₁ data show that the blanketing is high, but this index varies in an anomalous way which precludes a definitive determination of [Fe/H]. We consider two possible explanations for the behavior of the m₁ index. One is high microturbulance excited by the secondary pulsation mode, the other is the Am/Fm phenomenon. We find that the parameters from the Imbert (1980) radial velocity curve are essentially unchanged by our analysis. The Baade-Wesselink method fails for this star.

Abstract: For little-evolved stars in the Hyades, Coma, and M67, Cousins VRI photometry which includes and expands on results published in other systems by Taylor is presented. Observing and reduction procedures and error analysis are discussed in some detail, and evidence is presented that the transformations to the Cousins system are satisfactory and the results are internally consistent. Comparisons with data published by Mendoza yield agreement in R-I and V-R for the Hyades and V-R for M67. Disagreement is found, however, in both color indices for Coma and in R-I for M67, and reasons are suggested for favoring the obtained results in these cases. By comparing Mendoza's M67 K-giant data with those of other observers, it is found that any problem with Mendoza's M67 results is apparently limited to the faintest stars he observed. A suggestion by Schild and Weeks that Mendoza's M67 R magnitudes are about 0.1 mag in error is also tested, and it is found that available evidence does not support this suggestion.

Abstract:

Photometry of HD 200925 in the uvby and β systems has been secured and analyzed. The data strongly indicate that the variable is multiperiodic. A reddening value, E(b—y) = 0ṃ040, has been derived from the variable-and comparisonstar observations. Analysis of the intrinsic (b—y) and c x values for one primary pulsation cycle are used to determine a mean effective temperature (Teff) = 7470 K, and a mean surface gravity (log g) = 3.87. HD 200925 is found to have a somewhat higher abundance, [Fe/H] = +0.33, than stars in the Hyades. These values do not conform to the presently accepted properties for dwarf Cepheid variables.