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The gravitational redshift of Sirius B
Simon R. G. Joyce, Martin A. Barstow, Jay B. Holberg +3
Einstein's theory of General Relativity predicts that the light from stars will be gravitationally shifted to longer wavelengths. We previously used this effect to measure the mass…
Periodic Variability of the Barium Central Star of the Planetary Nebula Abell 70
Howard E. Bond, Robin Ciardullo
Abell 70 is a planetary nebula (PN) whose nucleus at optical wavelengths is a G8 star with enhanced carbon and s-process abundances--a "barium star." The cool star is a binary comp…
The Orbit of the Close Companion of Polaris: Hubble Space Telescope Imaging 2007 to 2014
Nancy Remage Evans, Margarita Karovska, Howard E. Bond +6
As part of a program to determine dynamical masses of Cepheids, we have imaged the nearest and brightest Cepheid, Polaris, with the Hubble Space Telescope Wide Field Planetary Came…
Spectroscopy of V341 Arae: A Nearby Nova-like Variable inside a Bow-Shock Nebula
Howard E. Bond, Brent Miszalski
V341 Arae is a 10th-magnitude variable star in the southern hemisphere, discovered over a century ago by Henrietta Leavitt but relatively little studied since then. Although histor…
SPIRITS 16tn in NGC 3556: A heavily obscured and low-luminosity supernova at 8.8 Mpc
Jacob E. Jencson, Mansi M. Kasliwal, Scott M. Adams +17
We present the discovery by the SPitzer InfraRed Intensive Transients Survey (SPIRITS) of a likely supernova (SN) in NGC 3556 at only 8.8 Mpc, which, despite its proximity, was not…