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4 papers · 2 filters
Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501
H. E. Bond, S. Kawaler, R. Ciardullo +17
We report on a global CCD time-series photometric campaign to decode the pulsations of the nucleus of the planetary nebula NGC1501. The star is hot and hydrogen-deficient, similar…
Limits on the Halo White Dwarf Component of Baryonic Dark Matter from the {\em Hubble Deep Field}
Steven D. Kawaler
The MACHO collaboration lensing event statistics suggest that a significant fraction of the dark galactic halo can be comprised of baryonic matter in the form of white dwarf stars…
Distant Ring Galaxies as Evidence for a Steeply Increasing Galaxy Interaction Rate with Redshift
R. J. Lavery, P. Seitzer, N. B. Suntzeff +2
Hubble Space Telescope WFPC2 images of the Local Group dwarf galaxy Tucana reveal an unbiased sample of distant field galaxies. While a large number of these galaxies can be classi…
The Head-on Collision between Two Gas-Rich Galaxies: Neutral Hydrogen Debris from the Centrally-smooth Ring Galaxy VIIZw466
P. N. Appleton, V. Charmandaris, C. Struck
We present VLA observations of the distribution and kinematics of the HI gas in the classical ring galaxy VIIZw466 and its immediate surroundings. The HI gas corresponding to the b…