Martioli, Eder, McArthur, Barbara E., Benedict, G. Fritz, Bean, Jacob L., Harrison, Thomas E., Armstrong, Amber
We use Hubble Space Telescope Fine Guidance Sensor astrometry and high-cadence radial velocities for HD136118 from the HET with archival data from Lick to determine the complete set of orbital...
Benedict, G. Fritz, McArthur, Barbara E., Napiwotzki, Ralf, Harrison, Thomas E., Harris, Hugh C., Nelan, Edmund, ...
We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our...
Astrometry - Challenging our Understanding of Stellar Structure and Evolution (2009)
Benedict, G. Fritz, Henry, Todd J., Olling, Rob
Stellar mass plays a central role in our understanding of star formation and aging. Stellar astronomy is largely based on two maps, both dependent on mass, either indirectly or directly: the...
Astrometric Discovery of GJ 164B (2008)
Pravdo, Steven H., Shaklan, Stuart B., Henry, Todd, Benedict, G. Fritz
We discovered a low-mass companion to the M dwarf GJ 164 with the CCD-based imaging system of the Stellar Planet Survey astrometric program. The existence of GJ 164B was confirmed with Hubble Space...
HST FGS astrometry - the value of fractional millisecond of arc precision (2008)
Benedict, G. Fritz, McArthur, Barbara E., Bean, Jacob L.
In a few years astrometry with the venerable combination of Hubble Space Telescope and Fine Guidance Sensor will be replaced by SIM, GAIA, and long-baseline interferometry. Until then we remain a...
G. Fritz Benedict, Barbara E. Mcarthur, Otto G. Franz, L. H. Wasserman, E. Nelan, J. Lee, ...
With Hubble Space Telescope Fine Guidance Sensor 3 we have determined a parallax for the white dwarfÈM dwarf interacting binary, Feige 24. The white dwarf (DA) component has an e†ective...
Detection of a Third Planet in the HD 74156 System Using the Hobby-Eberly Telescope (2007)
Bean, Jacob L., McArthur, Barbara E., Benedict, G. Fritz, Armstrong, Amber
We report the discovery of a third planetary mass companion to the G0 star HD 74156. High precision radial velocity measurements made with the Hobby-Eberly Telescope aided the detection of this...
Bean, Jacob L., McArthur, Barbara E., Benedict, G. Fritz, Harrison, Thomas E., Bizyaev, Dmitry, Nelan, Edmund, ...
We have determined a dynamical mass for the companion to HD 33636 which indicates it is a low-mass star instead of an exoplanet. Our result is based on an analysis of Hubble Space Telescope (HST)...
NACO-SDI direct imaging search for the exoplanet Eps Eri b (2007)
Janson, Markus, Brandner, Wolfgang, Henning, Thomas, Lenzen, Rainer, McArthur, Barbara, Benedict, G. Fritz, ...
The active K2V star $\epsilon$ Eri hosts the most nearby known extrasolar planet. With an angular separation of about 1" on average, and an age of a few to several hundred Myrs, $\epsilon$ Eri b is...
NACO-SDI direct imaging search for the exoplanet e Eri b (2007)
Janson, Markus, Brandner, Wolfgang, Henning, Thomas, Lenzen, Rainer, McArthur, Barbara, Benedict, G. Fritz, ...
The active K2 V star É Eri hosts the nearest known extrasolar planet. With an angular separation of about 1" on average, and an age of a few to several hundred megayears, É Eri b is one of the...
Benedict, G. Fritz, McArthur, Barbara E., Feast, Michael W., Barnes, Thomas G., Harrison, Thomas E., Patterson, Richard J., ...
(abridged) We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: l Car, zeta Gem, beta Dor, W Sgr, X Sgr, Y Sgr, FF Aql, T Vul, and RT...
Metallicities of M Dwarf Planet Hosts from Spectral Synthesis (2006)
Bean, Jacob L., Benedict, G. Fritz, Endl, Michael
We present the first spectroscopic metallicities of three M dwarfs with known or candidate planetary mass companions. We have analyzed high resolution, high signal-to-noise spectra of these stars...
The Extrasolar Planet epsilon Eridani b - Orbit and Mass (2006)
Benedict, G. Fritz, McArthur, Barbara E., Gatewood, George, Nelan, Edmund, Cochran, William D., Hatzes, Artie, ...
Hubble Space Telescope observations of the nearby (3.22 pc), K2 V star epsilon Eridani have been combined with ground-based astrometric and radial velocity data to determine the mass of its known...
Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test of Model Atmospheres (2006)
Bean, Jacob L., Sneden, Christopher, Hauschildt, Peter H., Johns-Krull, Christopher M., Benedict, G. Fritz
We describe a method for accurately determining M dwarf metallicities with spectral synthesis based on abundance analyses of visual binary stars. We obtained high resolution, high signal-to-noise...
The Extrasolar Planet e Eridani b: Orbit and mass (2006)
Benedict, G. Fritz, McArthur, Barbara E., Gatewood, George, Nelan, Edmund, Cochran, William D., Hatzes, Artie, ...
Hubble Space Telescope (HST) observations of the nearby (3.22 pc) K2 V star É Eridani have been combined with ground-based astrometric and radial velocity data to determine the mass of its known...
Confirmation of Errors in Hipparcos Parallaxes from HST/FGS Astrometry of the Pleiades (2004)
Soderblom, David R., Nelan, Ed, Benedict, G. Fritz, McArthur, Barbara, Ramirez, Ivan, Spiesman, William, ...
We present absolute trigonometric parallaxes and relative proper motions for three members of the Pleiades star cluster, obtained with HST's Fine Guidance Sensor 1r, a white-light interferometer. We...
Astrometric Discovery of GJ 164B (2004)
Pravdo, Steven H., Shaklan, Stuart B., Henry, Todd, Benedict, G. Fritz
We discovered a low-mass companion to the M-dwarf GJ 164 with the CCD-based imaging system of the Stellar Planet Survey (STEPS) astrometric program. The existence of GJ 164B was confirmed with Hubble...
McArthur, Barbara E., Endl, Michael, Cochran, William D., Benedict, G. Fritz, Fischer, Debra A., Marcy, Geoffrey W., ...
We report the detection of the lowest mass extra-solar planet yet found around a Sun-like star - a planet with an \msini of only 14.21 $\pm$ 2.91 Earth masses in an extremely short period orbit...
Benedict, G. Fritz, McArthur, B. E., Fredrick, L. W., Harrison, T. E., Skrutskie, M. F., Slesnick, C. L., ...
We present an absolute parallax and relative proper motion for the central star of the planetary nebula NGC 6853 (The Dumbell). We obtain these with astrometric data from FGS 3, a white-light...
Benedict, G. Fritz, McArthur, B. E., Fredrick, L. W., Harrison, T. E., Slesnick, C. L., Rhee, J., ...
We present an absolute parallax and relative proper motion for the fundamental distance scale calibrator, delta Cep. We obtain these with astrometric data from FGS 3, a white-light interferometer on...
Benedict, G. Fritz, Howell, D. Andrew, Jorgensen, Inger, Kenney, Jeffrey D. P., Smith, Beverly J.
Using HST WFPC2 images, we have obtained U, B, V, I, and H-alpha photometry for 76 star clusters in the nuclear star-forming ring of the barred spiral galaxy NGC 4314. These clusters are likely...
Benedict, G. Fritz, McArthur, B. E., Fredrick, L. W., Harrison, T. E., Lee, J., Slesnick, C. L., ...
We present an absolute parallax and relative proper motion for the fundamental distance scale calibrator, RR Lyr. We obtain these with astrometric data from FGS 3, a white-light interferometer on...
FGS Astrometry with the Hubble Space Telescope (2000)
This article describes astrometric science that can be done with the Hubble Space Telescope Fine Guidance Sensors and presents some recent science results. We outline how these data are modeled,...
Benedict, G. Fritz, McArthur, Barbara E., Franz, Otto G., Wasserman, Lawrence H., Henry, Todd J.
With fourteen epochs of fringe tracking data spanning 1.7y from Fine Guidance Sensor 3 we have obtained a parallax (pi_abs=113.1 +- 0.3 mas) and perturbation orbit for Gl 791.2A. Contemporaneous...
Benedict, G. Fritz, McArthur, Barbara, Chappell, D. W., Nelan, E., Jefferys, W. H., Van Altena, W., ...
We report on a sub-stellar companion search utilizing interferometric fringe-tracking astrometry acquired with Fine Guidance Sensor 3 (FGS 3) on the Hubble Space Telescope. Our targets were Proxima...
Benedict, G. Fritz, McArthur, Barbara, Nelan, E., Story, D., Whipple, A. L., Shelus, P. J., ...
We have observed Proxima Centauri and Barnard's Star with Hubble Space Telescope Fine Guidance Sensor 3. Proxima Centauri exhibits small-amplitude, periodic photometric variations. Once several...
NGC 4314. III. Inflowing Molecular Gas Feeding a Nuclear Ring of Star Formation (1996)
Benedict, G. Fritz, Smith, Beverly J., Kenney, Jeffrey D. P.
NGC 4314 is an early-type barred galaxy containing a nuclear ring of recent star formation. We present CO(1-0) interferometer data of the bar and circumnuclear region with 2.3 x 2.2 arcsec spatial...