A5074338191- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Isotope Analysis in Ecology
- Pulsars and Gravitational Waves Research
- Planetary Science and Exploration
- Advanced Mathematical Theories
- Historical Astronomy and Related Studies
Lowell Observatory
2012-2023
Northern Arizona University
2012
ABSTRACT We present the first results from an ongoing survey for multiplicity among bright stars using Navy Precision Optical Interferometer (NPOI). a summary of NPOI observations known multiple systems, including detection companion β Scuti with precise relative astrometry, to illustrate instrument’s sensitivity binaries at magnitude differences Δ m ⪅ 3 over range angular separation 3–860 milliarcseconds (mas). A limiting 700 ∼ 3.5 is likely where component spectral types differ by less...
Visible-light long baseline interferometry holds the promise of advancing a number important applications in fundamental astronomy, including direct measurement angular diameters and oblateness stars, orbits binary multiple star systems. To advance, field visible-light requires development instruments capable combining light from 15 baselines (6 telescopes) simultaneously. The Visible Imaging System for Interferometric Observations at NPOI (VISION) is new visible beam combiner Navy Precision...
Lowell Observatory's Discovery Channel Telescope is a 4.3m telescope designed and constructed for optical near infrared astronomical observation. It equipped with cube capable of carrying five instruments the wave front sensing guider systems at f/6.1 RC focus. We report on overall operations methods facility, including coordination day night activities, then cover pointing, unguided guided tracking performance mount. also discuss implementation open loop model for, manual wavefront...
Abstract We measured the angular diameters of six stars using six-element observing mode Navy Precision Optical Interferometer (NPOI) for first time since early 2000s. Four ranged from 1.2 to 1.9 mas, while two others were much smaller at approximately 0.5 mas 0.7 which are smallest date with NPOI. There is a larger spread in measurements than data obtained three-, four-, or five-element modes, can be attributed part flux imbalance due combination more siderostats single spectrograph, and...
Abstract We measured the angular diameters of 44 stars with Navy Precision Optical Interferometer, obtaining uncertainties on limb-darkened diameter 2% or less for all but four stars. then used our Gaia Hipparcos parallaxes to calculate each star’s physical radius. gathered information from literature determine bolometric flux and luminosity, combined that produce an effective temperature. Our sample consists mostly giant stars, spans a wide range spectral classes B M.
We present the results of a multiplicity survey for volume-limited sample 29 main-sequence F0–G0 stars within 17 pc conducted with Navy Precision Optical Interferometer (NPOI). Four companions were detected in previously known binary systems. The these show good agreement published orbits. For one sources, ι Peg, modeling our data, which includes closure phase information, confirms quadrant orbit. No new (within separations 3–860 mas and contrasts down to 3.5 mag at 700 nm). Combined an...
Observations with milliarsecond resolution using the Navy Optical Interferometer have been obtained for a number of stellar systems which include high-mass binaries, eclipsing and radio stars. These observations also reveal previously unseen companions in single-lined spectroscopic binaries via directly measured flux ratios. We will present examples published ongoing research efforts these to illustrate how an optical interferometer contributes our knowledge stars, their environment,...