Search Results - "FEKEL, FRANCIS C"

On Its Way to the Neutron Star–White Dwarf Binary Graveyard, IGR J16194−2810, A First Ascent M Giant X-Ray Binary by Hinkle, Kenneth H., Fekel, Francis C., Straniero, Oscar, Maas, Zachary G., Joyce, Richard R., Lebzelter, Thomas, Muterspaugh, Matthew W., Sowell, James R.

“…Abstract A single-lined spectroscopic orbit for the M giant in the X-ray binary IGR J16194−2810 is determined from a time series of optical spectra. The…”
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The Quadruple-lined, Doubly Eclipsing System V482 Persei by Torres, Guillermo, Lacy, Claud H. Sandberg, Fekel, Francis C., Wolf, Marek, Muterspaugh, Matthew W.

“…We report spectroscopic and differential photometric observations of the A-type system V482 Per, which reveal it to be a rare hierarchical quadruple system…”
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Infrared Spectroscopy of Symbiotic Stars. IV. V2116 Ophiuchi/GX 1+4, The Neutron Star Symbiotic by Hinkle, Kenneth H, Fekel, Francis C, Joyce, Richard R, Wood, Peter R, Smith, Verne V, Lebzelter, Thomas

“…We have computed, using 17 infrared radial velocities, the first set of orbital elements for the M giant in the symbiotic binary V2116 Ophiuchi. The giant's…”
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THIRD COMPONENT SEARCH AND ABUNDANCES OF THE VERY DUSTY SHORT-PERIOD BINARY BD +20°307 by FEKEL, Francis C, CORDERO, Maria J, GALICHER, Raphael, ZUCKERMAN, B, MELIS, Carl, WEINBERGER, Alycia J

“…We have obtained near-infrared adaptive optics imaging and collected additional radial velocity observations to search for a third component in the extremely…”
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The M Supergiant High-mass X-Ray Binary 4U 1954+31 by Hinkle, Kenneth H., Lebzelter, Thomas, Fekel, Francis C., Straniero, Oscar, Joyce, Richard R., Prato, Lisa, Karnath, Nicole, Habel, Nolan

“…Abstract The X-ray binary 4U 1954+31 has been classified as a low-mass X-ray binary containing an M giant and a neutron star (NS). It has also been included in…”
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The 2020 Eclipse of R Aquarii in the Near-infrared: Mid-eclipse Observations of Disk Distress by Hinkle, Kenneth H., Brittain, Sean, Fekel, Francis C., Lebzelter, Thomas, Boogert, Adwin

“…Abstract The Mira in the bright, dusty, symbiotic binary R Aquarii undergoes eclipses of multiyear duration every ∼44 yr by a large, opaque accretion disk. The…”
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Nine Bright γ Doradus Variables Discovered with Ground-based Photometry by Henry, Gregory W., Fekel, Francis C., Williamson, Michael H.

“…Abstract We have used precise photometric and high-dispersion spectroscopic observations to study nine candidate γ Doradus ( γ Dor) stars, identified as…”
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Infrared Spectroscopy of Symbiotic Stars. XII. The Neutron Star SyXB System 4U 1700+24 = V934 Herculis by Hinkle, Kenneth H., Fekel, Francis C., Joyce, Richard R., Miko ajewska, Joanna, Ga an, Cezary, Lebzelter, Thomas

“…The X-ray symbiotic (SyXB) V934 Her = 4U 1700+24 is an M giant-neutron star (NS) binary system. Employing optical and infrared radial velocities spanning 29 yr…”
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An Analysis of the Eclipsing Binaries HD 71636, V1022 Cassiopeiae, and OT Andromedae by Fekel, Francis C., Henry, Gregory W., Sowell, James R., Partington, Ethan R., Wedemeyer, Joanna M., Nakum, ArjunSinh

“…Abstract We have obtained high-dispersion spectroscopy and BV photometry of two F-type eclipsing binaries, HD 71636 and V1022 Cas, plus the A-type system OT…”
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Absolute Dimensions of the Unevolved F-type Eclipsing Binary BT Vulpeculae by Torres, Guillermo, Lacy, Claud H. Sandberg, Fekel, Francis C., Muterspaugh, Matthew W.

“…We report extensive differential V-band photometry and high-resolution spectroscopy for the 1.14 day, detached, double-lined eclipsing binary BT Vul (F0+F7)…”
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INFRARED SPECTROSCOPY OF SYMBIOTIC STARS. IX. D-TYPE SYMBIOTIC NOVAE by Hinkle, Kenneth H, FEKEL, FRANCIS C, Joyce, Richard R, Wood, Peter

“…Time-series spectra of the near-infrared 1.6 mu m region have been obtained for five of the six known D-type symbiotic novae. The spectra map the pulsation…”
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Absolute Dimensions of the Early F-type Eclipsing Binary V506 Ophiuchi by Torres, Guillermo, Sandberg Lacy, Claud H., Fekel, Francis C., Muterspaugh, Matthew W.

“…We report extensive differential V-band photometry and high-resolution spectroscopic observations of the early F-type, 1.06-day detached eclipsing binary V506…”
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Establishing α Oph as a Prototype Rotator: Precision Orbit with New Keck, CHARA, and RV Observations by Gardner, Tyler, Monnier, John D., Fekel, Francis C., Williamson, Michael, Baron, Fabien, Hinkley, Sasha, Ireland, Michael, Kraus, Adam L., Kraus, Stefan, Roettenbacher, Rachael M., Schaefer, Gail, Sturmann, Judit, Sturmann, Laszlo, ten Brummelaar, Theo

“…Abstract Alpha Ophiuchi (Rasalhague) is a nearby rapidly rotating A5IV star that has been imaged by infrared interferometry. α Oph is also part of a known…”
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ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI by Gardner, Tyler, Monnier, John D., Fekel, Francis C., Le Bouquin, Jean-Baptiste, Scovera, Adam, Schaefer, Gail, Kraus, Stefan, Adams, Fred C., Anugu, Narsireddy, Berger, Jean-Philippe, Ten Brummelaar, Theo, Davies, Claire L., Ennis, Jacob, Gies, Douglas R., Johnson, Keith J. C., Kervella, Pierre, Kratter, Kaitlin M., Labdon, Aaron, Lanthermann, Cyprien, Sahlmann, Johannes, Setterholm, Benjamin R.

“…Abstract We started a survey with CHARA/MIRC-X and VLTI/GRAVITY to search for low-mass companions orbiting individual components of intermediate-mass binary…”
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Visual Orbits of Spectroscopic Binaries with the CHARA Array. IV. HD 61859, HD 89822, HD 109510, and HD 191692 by Lester, Kathryn V., Schaefer, Gail H., Fekel, Francis C., Gies, Douglas R., Henry, Todd J., Jao, Wei-Chun, Paredes, Leonardo A., Hubbard-James, Hodari-Sadiki, Farrington, Christopher D., Gordon, Kathryn D., Chojnowski, S. Drew, Monnier, John D., Kraus, Stefan, Bouquin, Jean-Baptiste Le, Anugu, Narsireddy, Brummelaar, Theo Ten, Davies, Claire L., Gardner, Tyler, Labdon, Aaron, Lanthermann, Cyprien, Setterholm, Benjamin R.

“…Abstract We present the visual orbits of four spectroscopic binary stars, HD 61859, HD 89822, HD 109510, and HD 191692, using long baseline interferometry with…”
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Precision Orbit of δ Delphini and Prospects for Astrometric Detection of Exoplanets by Gardner, Tyler, Monnier, John D., Fekel, Francis C., Williamson, Mike, Duncan, Douglas K., White, Timothy R., Ireland, Michael, Adams, Fred C., Barman, Travis, Baron, Fabien, Brummelaar, Theo ten, Che, Xiao, Huber, Daniel, Kraus, Stefan, Roettenbacher, Rachael M., Schaefer, Gail, Sturmann, Judit, Sturmann, Laszlo, Swihart, Samuel J., Zhao, Ming

“…Combining visual and spectroscopic orbits of binary stars leads to a determination of the full 3D orbit, individual masses, and distance to the system. We…”
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DETECTING THE COMPANIONS AND ELLIPSOIDAL VARIATIONS OF RS CVN PRIMARIES. II. o DRACONIS, A CANDIDATE FOR RECENT LOW-MASS COMPANION INGESTION by Roettenbacher, Rachael M., Monnier, John D., Fekel, Francis C., Henry, Gregory W., Korhonen, Heidi, Latham, David W., Muterspaugh, Matthew W., Williamson, Michael H., Baron, Fabien, Brummelaar, Theo A. ten, Che, Xiao, Harmon, Robert O., Schaefer, Gail H., Scott, Nicholas J., Sturmann, Judit, Sturmann, Laszlo, Turner, Nils H.

“…ABSTRACT To measure the stellar and orbital properties of the metal-poor RS CVn binary o Draconis (o Dra), we directly detect the companion using…”
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Infrared Spectroscopy of Symbiotic Stars. VII. Binary Orbit and Long Secondary Period Variability of CH Cygni by Hinkle, Kenneth H, Fekel, Francis C, Joyce, Richard R

“…High-dispersion spectroscopic observations are used to refine orbital elements for the symbiotic binary CH Cyg. The current radial velocities, added to a…”
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HR 8257: A Three-Dimensional Orbit and Basic Properties by Fekel, Francis C, Boden, Andrew F, Tomkin, Jocelyn, Torres, Guillermo

“…We have used interferometric and spectroscopic observations of HR 8257 to determine a three-dimensional orbit of the system. The orbit has a period of 12.21345…”
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Planetary Systems around Close Binary Stars: The Case of the Very Dusty, Sun-like, Spectroscopic Binary BD+20 307 by Zuckerman, B, Fekel, Francis C, Williamson, Michael H, Henry, Gregory W, Muno, M. P

“…Field star BD+20 307 is the dustiest known main-sequence star, based on the fraction of its bolometric luminosity, [image]4%, that is emitted at infrared…”
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