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Nearby Young Solar Analogs. I. Catalog and Stellar Characteristics
Gaidos, Eric J.
We present a catalog of 38 young solar analogs within 25 pc, stars that are uniquely well suited for observations of their circumstellar environments to improve our understanding of conditions within the solar system during the Hadean/early Archean eons (prior to 3.8 Gyr ago). These G and early K stars were selected from the Hipparcos astrometric …
HIPPARCOS Parallaxes of Eclipsing Binaries and the Radiative Flux Scale
Popper, Daniel M.
Eclipsing binaries with Hipparcos parallaxes are found to define a radiative flux relation for main-sequence stars in the B6-F0 range about as well as stars with angular diameters and to extend the range to F8. The fluxes of components of binaries showing large intrinsic variations fall well below the curve for other stars and its extension to low…
Pulsation Modes in Small-Amplitude Red Variable Stars
Percy, John R.; Parkes, Michael
We have investigated the pulsation modes of small-amplitude red variables with well-determined periods and accurate Hipparcos parallaxes by comparing observational and theoretical Q-values. In our sample of 13 stars, one appears to be pulsating in the third overtone, nine in the first or second overtone, and three in the fundamental or first overt…
Recalibration of the Wilson-Bappu Effect Using the Singly Ionized Magnesium K Line
Mena-Werth, Jose; Scoville, Frederick
A new calibration of the Wilson-Bappu effect is presented using data from a survey of the singly ionized magnesium (Mg ii) h and k lines (near 280 nm) taken from the archives of the International Ultraviolet Explorer satellite. Our sample consisted of 94 stars with absolute magnitudes derived from parallaxes reported from Hipparcos. We describe th…