A5005030067- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- SAS software applications and methods
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Mechanics and Biomechanics Studies
- Historical Astronomy and Related Studies
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Astronomical and nuclear sciences
- Cosmology and Gravitation Theories
- Planetary Science and Exploration
Tel Aviv University
2008-2021
University of Wisconsin–Madison
2007
European Space Astronomy Centre
2007
Osservatorio Astronomico di Padova
2007
Osservatorio Astrofisico di Torino
2007
University of Padua
2007
Universidade Federal do Rio Grande do Sul
2000
Hebrew College
1996
Open University of Israel
1995
Alzheimer's Association of Israel
1993
view Abstract Citations (502) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Steps toward Determination of the Size and Structure Broad-Line Region in Active Galactic Nuclei. I. an 8 Month Campaign Monitoring NGC 5548 with IUE Clavel, J. ; Reichert, G. A. Alloin, D. Crenshaw, M. Kriss, Krolik, H. Malkan, Netzer, Peterson, B. Wamsteker, W. Altamore, Baribaud, T. Barr, P. Beck, S. Binette, L. Bromage, E. Brosch, N. Diaz, Filippenko, V. Fricke,...
view Abstract Citations (255) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Whole Earth Telescope Observations of the DBV White Dwarf GD 358 Winget, D. E. ; Nather, R. Clemens, J. C. Provencal, L. Kleinman, S. Bradley, P. A. Claver, F. Dixson, Montgomery, M. H. Hansen, Hine, B. Birch, Candy, Marar, T. K. Seetha, Ashoka, N. Leibowitz, O'Donoghue, Warner, Buckley, Tripe, Vauclair, G. Dolez, Chevreton, Serre, Garrido, Kepler, O. Kanaan,...
The white dwarfs are promising laboratories for the study of cosmochronology and stellar evolution. Through observations pulsating dwarfs, we can measure their internal structures compositions, critical to understanding post main sequence evolution, along with cooling rates, allowing us calibrate ages directly. most important set dwarf variables oldest pulsators, cool DAVs, which have not previously been explored through asteroseismology due complexity instability. a time-series photometry...
(Abridged) We present densely sampled BVRI light curves of the optical transient associated with gamma-ray burst GRB 030329, result a coordinated observing campaign conducted at five observatories. Augmented published observations this GRB, compiled dataset contains 2687 photometric measurements, obtained between 78 minutes and 79 days after burst. show that underlying supernova 2003dh evolved faster than, was probably somewhat fainter than type Ic SN 1998bw, 980425. find our data can be...
We present the light curves of 21 gravitational microlensing events from first six years MACHO Project survey that are likely examples lensing by binary systems. These were manually selected a total sample ~350 candidate either detected Alert System or discovered through retrospective analyses database. At least 14 these exhibit strong (caustic) features, and four well fit with large mass ratio (brown dwarf planetary) systems, although fits not necessarily unique. The event rate is roughly...
view Abstract Citations (148) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Rate Active Galaxy Monitoring at the Wise Observatory. III. The Broad-Line Region of NGC 4151 Maoz, D. ; Netzer, H. Mazeh, T. Beck, S. Almoznino, E. Leibowitz, Brosch, N. Mendelson, Laor, A. We present results our AGN monitoring program for Seyfert galaxy 4151. high sampling rate and flux calibration accuracy observations allowed us in first two papers this...
We present X-ray grating spectra of the recurrent nova RS Ophiuchi during its 2006 outburst, obtained with XMM-Newton and Chandra. For first month after optical maximum, spectrum was hard dominated by emission lines H-like He-like ions. The luminosity 2.4 × 1036 ergs s−1 in 0.33-10 keV range. indicate a collisionally plasma broad range temperatures an energy-dependent velocity structure. During observation week 4, soft flare occurred which new system soft, higher appeared spectrum. Then,...
We report multisite observations devoted to the main-sequence δ Scuti star XX Pyx, conducted as 17th run of Delta Network. Over 125 nights a total 550 h usable time-series photometric B- and V-filter data were acquired involving both photoelectric CCD measurements at eight observatories spread around world, which represents most extensive single for any pulsating other than Sun obtained so far.
view Abstract Citations (95) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Detection of the Evolutionary Time Scale DA White Dwarf G117-B15A with Whole Earth Telescope Kepler, S. O. ; Winget, D. E. Nather, R. Bradley, P. A. Grauer, Fontaine, G. Bergeron, Vauclair, Claver, C. F. Marar, T. M. K. Seetha, Ashoka, B. N. Mazeh, Leibowitz, Dolez, Chevreton, Barstow, Clemens, J. Kleinman, Sansom, Tweedy, W. Kanaan, Hine, Provencal, L. Wesemael,...
92 h of new Whole Earth Telescope observations have been acquired for the δ Scuti star CD-24 7599. All seven pulsation modes reported by Handler et al. are confirmed. However, significant amplitude variations which not caused beating closely spaced frequencies occurred within two years. Analysing combined data both WET runs, we detect six further modes, bringing total number up to 13. We also examine our high-frequency pulsations similar those exhibited rapidly oscillating Ap stars, but do...
We report on X-ray, optical and infrared follow-up observations of GRB 980703. detect a previously unknown X-ray source in the error box; assuming power law decline we find for its decay index alpha < -0.91 (3-sigma). invoke host galaxy extinction to match observed spectral slope with expected from `fireball' models. no evidence break range 1998 July 4.4, determine lower limit cooling frequency: nu_c > 1.3 x 10^{17} Hz. For this epoch obtain an A_V = 1.50 +/- 0.11. From data estimate be 20.2...
view Abstract Citations (91) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Rate Spectroscopic Active Galactic Nucleus Monitoring at the Wise Observatory. I. Markarian 279 Maoz, D. ; Netzer, H. Leibowitz, E. Brosch, N. Laor, A. Mendelson, Beck, S. Almoznino, Mazeh, T. We monitored sprectrophotometrically a sample of AGNs, and achieved temporal sampling rate once every 3-4 days, over period 5-7 months. By observing each object...
We present the results of 32 nights CCD photometry V1974 Cygni, from 1994 and 1995. verify presence two distinct periodicities in light curve: 0.0812585 d ≈ 1.95 h 0.0849767 2.04 h. establish that shorter periodicity is orbital period underlying binary system. The longer oscillates with an average value ∼3×10−7 — typical permanent superhumps.
view Abstract Citations (71) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Whole Earth Telescope Observations and Seismological Analysis of the Pre--White Dwarf PG 2131+066 Kawaler, S. D. ; O'Brien, M. Clemens, J. C. Nather, R. E. Winget, Watson, T. K. Yanagida, Dixson, Bradley, P. A. Wood, Sullivan, Kleinman, Meistas, Leibowitz, Moskalik, Zola, Pajdosz, G. Krzesinski, Solheim, -E. Bruvold, O'Donoghue, Katz, Vauclair, Dolez, N. Chevreton,...
We present a detailed analysis of the rapidly pulsating subdwarf B star (or EC14026 star) PG 1325+101. This exploits outcome dedicated multisite observations using time-series photometry that revealed presence (at least) 15 periodicities in luminosity modulation this (Silvotti et al. 2006, A&A, 459, 557, Paper I). Based on high-, medium-resolution spectra obtained at Steward Observatory's 2.3 m Telescope and 6.5 MMT Telescope, new NLTE spectroscopic derivations atmospheric parameters...
view Abstract Citations (64) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Rate Spectroscopic Active Galactic Nucleus Monitoring at the Wise Observatory. II. NGC 5548 Netzer, H. ; Maoz, D. Laor, A. Mendelson, Brosch, N. Leibowitz, E. Almoznino, Beck, S. Mazeh, T. We present further results of spectroscopic monitoring AGNs, described in Paper I this series, for Seyfert galaxy 5548. The high sampling rate (44 spectra during a 149 day...
view Abstract Citations (43) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Whole Earth Telescope Observations of the DAV White Dwarf G226-29 Kepler, S. O. ; Giovannini, Wood, M. A. Nather, R. E. Winget, D. Kanaan, Kleinman, J. Bradley, P. Provencal, L. Clemens, C. Claver, F. Watson, T. K. Yanagida, Krisciunas, Marar, Seetha, Ashoka, B. N. Leibowitz, Mendelson, H. Mazeh, Moskalik, Krzesinski, Pajdosz, G. Zola, Solheim, -E. Emanuelsen, -I....
This paper analyses the Whole Earth Telescope observations of HL Tau 76, first discovered pulsating DA white dwarf. The star was observed during two campaigns. It a second priority target XCOV13 campaign in 1996 and one XCOV18 1999. 1999 reached 66.5% duty cycle. With total duration 18 days, frequency resolution achieved is 0.68 μHz. such resolution, we were able to find as many 78 significant frequencies power spectrum, which 34 are independent after removal all linear combinations. In...
We present a detailed mode identification performed on the 1994 Whole Earth Telescope (WET) run GD 358. The results are compared with that obtained for same star from 1990 WET data. two temporal spectra show very few qualitative differences, although amplitude changes seen in most modes, including disappearance of identified as k=14 excellent coverage and signal-to-noise ratio during lead to secure combination frequencies up fourth order, i.e. peaks sums or differences four parent...
Sixteen young male subjects with psoriasis (mean of 4.9% skin surface area involvement) and 10 healthy controls underwent a heat exercise test (40 °C, 40% r.h.) for 2 h. Rectal temperature (Tr). mean (Tsk), heart rate (HR) storage (dS) were measured calculated. A sharper rise was found all parameters in the psoriatic patients as compared controls. Statistically significant differences Tr after 60 min (37.9 ± 0.1°C 37.5 controls, respectively) at termination (38.3 0.1°C). Heat end first hour...