Stars and Clusters

SwSt 1: an O-rich planetary nebula around a C-rich central star

“…Subsequently, SwSt 1 was observed spectroscopically on six distinct occasions: by Payne Gaposchkin & Gaposchkin (1938a,b, source spectra unknown); in 1940 by Swings & Struve (1940; in the range at dispersions of 100 and 50 Å mm −1 ); in 1942 by Swings & Struve (1943; in 1962 by Carlson & Henize (1979; in the range at a dispersion of 177 Å mm −1 blue‐ward of 5000 Å and 94 Å mm −1 red‐ward of 5000 Å); by Aller (1977, although the date of the spectrum is not indicated; the range of the observations is in 1976 by Flower et al (1984; in the range at a resolution of 7 Å); in 1985 by de Freitas Pacheco & Veliz (1987; in the range at resolutions of 6.5 and 0.5 Å); in by Leuenhagen & Hamann (1998; in the ranges and at a resolution of 1 Å) and by us in 1993 (in the range at a resolution of 0.15 Å, and in the range at a resolution of 0.35 Å).…”

RV Tauri and the RVB phenomenon. I. Photometry of RV Tauri

“…UBV photometry has been published by DuPuy (1973), Dawson (1979), Dawson & Patterson (1982) and Wahlgren (1992). Photographic observations were given by Payne-Gaposchkin et al (1943) and Rosino (1951) while visual observations by Beyer (1930), Ceraski (1905), Enebo (1907), Hartwig (1913), McLaughlin (1934), Pračka (1910), Seares & Haynes (1908) and Stein (1944). Van der Bilt (1916) collected all visual observations of his time including a large number of unpublished ones.…”

Quantitative Scaling for the Self-Similar Hierarchical Cosmology

“…Given the mass calculated above, the Schwarschild radius (R G ) for the galactic analogue is _ 2GM~(2)(6.67 x 10-8 dyne em? g-2)(3.5 x 10 8 (14). [f this scaling of "universal constants" is a valid idea, then we should be able to apply the same rescaling method and derive a Schwarschild radius (R.I') for the proton that is approximately equal to r1:L or about 0.8 x 10-I em.…”

“…Using Eq. (8) and the radius of the Sun we can calculate that the second electron analogue is in the state n 2~5 , with the azimuthal quantum number (I) and magnetic quantum number (m) both equal to O. The state of the innermost electron analogue is not subject to direct determination because of shielding by the second electron analogue.…”

“…(5) and substituting Jupiter's average orbital velocity of 13.1 x 10 5 cm/sec for Do, we derive an approximate n for the Solar System of 168. This value can then be used in conjunction with Jupiter's average orbital radius and the orbital radius equation for a Rydberg atom, (8) where Uo is the Bohr radius, to derive an analogue radius Ao~2.8 x 10 9cm for the stellar scale. This value for A o is very encouraging since it is at the lower end of the radius range for red dwarf stars which, as we shall see in more detail below, are by far the most numerous stars in the universe and thus meet the crucial abundance requirement for an appropriate analogue to hydrogen atoms.…”