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Luminous Infrared Galaxies. III. Multiple Merger, Extended Massive Star Formation, Galactic Wind, and Nuclear Inflow in NGC 3256
Taniguchi, Y.; Terlevich, R.; Lípari, S. +3 more
We report detailed evidence for multiple merger, extended massive star formation, galactic wind, and circular/noncircular motions in the luminous infrared galaxy NGC 3256, based on observations of high-resolution imaging (Hubble Space Telescope, ESO NTT), and extensive spectroscopic data (more than 1000 spectra, collected at Estación Astrofísica d…
Hubble Space Telescope Observations of the Planetary Nebula K648 in the Globular Cluster M15
Livio, Mario; Bond, Howard E.; Alves, David R.
We have obtained observations of the planetary nebula K648 in the Galactic globular cluster M15 with the Hubble Space Telescope's Wide Field Planetary Camera 2, covering an interval of 7 days. The frames provide both time-sampled broadband photometry of the central star and high-resolution images of the nebula in the light of Hα, [O III], and [N I…
The Near-Ultraviolet Continuum of Late-Type Stars
Lambert, David L.; Allende Prieto, Carlos
Analyses of the near-ultraviolet continuum of late-type stars have led to controversial results regarding the performance of state-of-the-art model atmospheres. The release of the homogeneous International Ultraviolet Explorer (IUE) final archive and the availability of the high-accuracy Hipparcos parallaxes provide an opportunity to revisit this …
The Asymmetric Coma of Comets. I. Asymmetric Outgassing from the Nucleus of Comet 2P/Encke
Festou, M. C.; Barale, O.
Very little is known about how outgassing regions are distributed over the nucleus of comets. In periodic comets, active regions are believed to be few and of small extent. Since periodic comets are notorious for their lack of (small) solid particles that efficiently scatter sunlight, we try to find traces of the existence of production sites by e…
V1334 Cygni: A Triple System Containing a Classical Cepheid
Evans, Nancy Remage
We have observed the small-amplitude Cepheid V1334 Cyg A (pulsation period 3.3 days) for nearly 30 years. From these radial velocity data we have derived an orbit with a period of 5 years. From this orbit we have derived limits on the mass of the companion (V1334 Cyg C) of 3.1 to 4.4 Msolar. The system is also a marginally resolved visu…
The 0.33 Day DA Plus DME Binary BPM 6502
Vennes, Stéphane; Dupuis, Jean; Kawka, Adela +1 more
We have obtained a series of spectroscopic measurements of the high proper-motion star BPM 6502 showing Balmer emission superposed upon the absorption lines. Radial velocity measurements determined by tracing optical absorption and emission lines show that the star is a binary system comprised of a DA white dwarf and an M dwarf with an orbital per…
The Orbit of the Classical Cepheid AW Persei Revisited
Evans, Nancy Remage; Wahlgren, Glenn M.; Vinko, Jozsef
We have obtained new velocity data for the classical Cepheid AW Persei and used them to derive a new orbit for the binary star system of which it is part. The orbital period (40 yr) is slightly longer than the previously determined orbit. The lower limit to the mass of the secondary from the new mass function is 6.6 Msolar. This is much…