B. Stecklum
A5000760314- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Molecular Spectroscopy and Structure
- Galaxies: Formation, Evolution, Phenomena
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Isotope Analysis in Ecology
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Space Exploration and Technology
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Advanced Measurement and Metrology Techniques
Thüringer Landessternwarte Tautenburg
2015-2024
Arcetri Astrophysical Observatory
2018
Max Planck Institute for Radio Astronomy
2018
Institut de Radioastronomie Millimétrique
2018
Dublin Institute For Advanced Studies
2018
University of Stuttgart
2009
University of Hawaii at Hilo
2009
Friedrich Schiller University Jena
1982-1994
Amt für Archäologie
1991
Schiller International University
1985-1989
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
We present multiwavelength observations of the afterglow GRB 130427A, brightest (in total fluence) gamma-ray burst (GRB) past 29 yr. Optical spectroscopy from Gemini-North reveals redshift to be z = 0.340, indicating that its unprecedented brightness is primarily result relatively close proximity Earth; intrinsic luminosities both and are not extreme in comparison other bright GRBs. a large suite spanning 300 s 130 days after demonstrate shows simple, smooth evolution at all frequencies,...
Ultrashort, high-power laser pulses propagating vertically in the atmosphere have been observed over more than 20 km using an imaging 2-m astronomical telescope. This direct observation several wavelength bands shows indications for filament formation at distances as far 2 atmosphere. Moreover, beam divergence 5 altitude is smaller expected, bearing evidence whole-beam parallelization about nonlinear focus. We discuss implications white-light Lidar applications.
Context. The CoRoT mission, a pioneer in exoplanet searches from space, has completed its first 150 days of continuous observations ~12000 stars the galactic plane. An analysis raw data identifies most promising candidates and triggers ground-based follow-up. Aims. We report on discovery transiting planet CoRoT-Exo-2b, with period 1.743 days, characterize main parameters. Methods. filter light curve cosmic impacts, orbital residuals, low frequency signals star. folded 78 transits is fitted...
Aims. We present a panchromatic study, involving multiple technique approach, of the circumstellar disc surrounding T Tauri star IM Lupi (Sz 82). Methods. have undertaken comprehensive observational study using photometry, spectroscopy, millimetre interferometry and multi-wavelength imaging. For first time, is resolved from optical near-infrared wavelengths in scattered light, to regime thermal emission. Our data-set, conjunction with existing photometric data, provides an extensive coverage...
We present B-, V-, RC-, IC-, J-, H-, K-, and K'-band observations of the optical transient (OT) associated with GRB 970228, based on a reanalysis previously used images unpublished data. In order to minimize calibration differences, we have collected analyzed most photometry consistently determined magnitude OT relative set secondary field stars. confirm our earlier finding that early decay light curves (before 1997 March 6) was faster than at intermediate times (between 6 April 7). At late...
Coronagraphic imaging of the nearest Herbig Be star with Space Telescope Imaging Spectrograph (STIS) on board Hubble Telescope, Ks (2.15 μm) ADONIS at 3.6 m telescope La Silla, and mid-infrared OSCIR using 4 Blanco Cerro Tololo Inter-American Observatory confirm detection disk reported by Pantin et al. map out to 5'' (∼515 AU) in optical Ks. While source is unresolved 10 18 μm, it can be traced 15 11.7 μm. We change radial dependence surface brightness near 27 seen 1.6 μm Augereau No such...
The motivation, techniques and performance of the ground-based photometric follow-up transit detections by CoRoT space mission are presented. Its principal <i>raison d'être<i/> arises from much higher spatial resolution common telescopes in comparison to CoRoT's cameras. This allows identification many candidates as arising eclipsing binaries that contaminating lightcurves, even low-amplitude events cannot be detected with obervations. For ground observations, "on" – "off" photometry is now...
Aims. Recently, substantial flaring in the 6.7 GHz methanol maser line has been observed toward high-mass young stellar object (YSO) S255 NIRS 3, where an accretion burst was also detected IR. Our goal is to study change properties of masers between pre- and outburst phases, investigate connection burst.
Class II methanol masers are signs of massive young stellar objects (MYSOs). Recent findings show that MYSO accretion bursts cause flares these masers. Thus, maser monitoring can be used to identify such bursts. Burst-induced SED changes provide valuable information on a very intense phase high-mass star formation. In mid-January 2019, flare the G358.93-0.03 was reported. ALMA and SMA imaging resolved core forming region proved association with brightest continuum source MM1. However, no...
Context.A severe problem for research in star-formation is that the masses of young stars are almost always estimated from evolutionary tracks alone. Since published by different groups differ, it often only possible to give a rough estimate stars. It thus crucial test and calibrate tracks. Up now, few tests could be carried out. However, now with VLTI set constrains on determining many binary precisely.
We present the goals and preliminary results of an unbiased, near-infrared, narrow-band imaging survey first galactic quadrant (10° < l 65°; −13 b +13). This area includes most giant molecular clouds massive star forming regions in Northern hemisphere. The is centred on 1–0 S(1) rovibrational line H2, a proven tracer hot, dense gas star-forming regions, around evolved stars, supernova remnants. observations complement existing upcoming photometric surveys (Spitzer-GLIMPSE, UKIDSS-GPS,...
Abstract We present (sub)millimeter imaging at 0.″5 resolution of the massive star-forming region G358.93−0.03 acquired in multiple epochs 2 and 3 months following recent flaring its 6.7 GHz CH OH maser emission. Using Submillimeter Array Atacama Large Millimeter/submillimeter Array, we have discovered 14 new Class II lines ranging frequency from 199 to 361 GHz, which originate mostly = 1 torsionally excited transitions include one transition. The latter detection provides first...
Context. Recent observations of the massive young stellar object S255 NIRS 3 have revealed a large increase in both methanol maser flux density and IR emission, which been interpreted as result an accretion outburst, possibly due to instabilities circumstellar disk. This indicates that this type event could be common young/forming early-type stars their lower mass siblings, supports idea onto star may occur non-continuous way. Aims. As ejection are believed tightly associated phenomena, we...
Abstract We report the first detection of isotopic methanol ( 13 CH 3 OH) maser emission in interstellar space. The was detected toward high-mass young stellar object G358.93-0.03 during monitoring a flare 6.7 GHz (CH this source. find that spectral and spatial distribution OH masers differs from imaged at same epoch, contrary to expectations similarity their pumping. This conclusively demonstrates are bright under different physical conditions suggests they can provide additional,...