Zobrazeno 1 - 10
of 153
pro vyhledávání: '"Hartkopf, William I"'
Publikováno v:
AJ 156, 240, 2018
The results of 3,989 intensified CCD observations of double stars, made with the 26-inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over two thousand short-exposure images. These o
Externí odkaz:
http://arxiv.org/abs/1811.00813
The results of speckle interferometric observations at the 4.1 m SOAR telescope in 2016 and 2017 are given, totaling 2483 measurements of 1570 resolved pairs and 609 non-resolutions. We describe briefly recent changes in the instrument and observing
Externí odkaz:
http://arxiv.org/abs/1804.10553
Autor:
Harris, Hugh C., Dahn, Conard C., Subasavage, John P., Munn, Jeffrey A., Canzian, Blaise J., Levine, Stephen E., Monet, Alice B., Pier, Jeffrey R., Stone, Ronald C., Tilleman, Trudy M., Hartkopf, William I.
Parallaxes are presented for a sample of 20 nearby dwarf carbon stars. The inferred luminosities cover almost two orders of magnitude. Their absolute magnitudes and tangential velocities confirm prior expectations that some originate in the Galactic
Externí odkaz:
http://arxiv.org/abs/1804.09824
Autor:
Mason, Brian D., Hartkopf, William I., Miles, Korie N., Subasavage, John P., Raghavan, Deepak, Henry, Todd J.
We report high resolution optical speckle observations of 336 M dwarfs which result in 113 measurements of relative position of 80 systems and 256 other stars with no indications of duplicity. These are the first measurements for two of the systems.
Externí odkaz:
http://arxiv.org/abs/1804.07845
Autor:
Mason, Brian D., Hartkopf, William I.
The results of 4,747 intensified CCD observations of double stars, made with the 26-inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over two thousand short-exposure images. These o
Externí odkaz:
http://arxiv.org/abs/1707.06060
A new relative orbit solution with new dynamical masses is determined for the nearby white dwarf - red dwarf pair 40 Eri BC. The period is 230.09+/-0.68y. It is predicted to close slowly over the next half-century getting as close as 1.32" in early 2
Externí odkaz:
http://arxiv.org/abs/1707.03635
The results of speckle interferometric observations at the SOAR telescope in 2015 are given, totalling 1303 measurements of 924 resolved binary and multiple stars and non-resolutions of 260 targets. The separations range from 12 mas to 3.37" (median
Externí odkaz:
http://arxiv.org/abs/1603.07596
Autor:
Roberts, Jr., Lewis C., Tokovinin, Andrei, Mason, Brian D., Hartkopf, William I., Riddle, Reed L.
Twenty multiple stellar systems with solar-type primaries were observed at high angular resolution using the PALM-3000 adaptive optics system at the 5 m Hale telescope. The goal was to complement the knowledge of hierarchical multiplicity in the sola
Externí odkaz:
http://arxiv.org/abs/1509.00745
The results of speckle interferometric observations at the SOAR telescope in 2014 are given. A total of 1641 observations were taken, yielding 1636 measurements of 1218 resolved binary and multiple stars and 577 non-resolutions of 441 targets. We res
Externí odkaz:
http://arxiv.org/abs/1506.05718
Autor:
Roberts, Jr., Lewis C., Tokovinin, Andrei, Mason, Brian D., Riddle, Reed L., Hartkopf, William I., Law, Nicholas M., Baranec, Christoph
We discuss two multiple star systems that host known exoplanets: HD 2638 and 30 Ari B. Adaptive optics imagery revealed an additional stellar companion to both stars. We collected multi-epoch images of the systems with Robo-AO and the PALM-3000 adapt
Externí odkaz:
http://arxiv.org/abs/1503.01211