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Analysis of Low Excitation HDO Transitions toward the High-mass Star-forming Regions G34.26+0.15, W51e1/e2, and W49N
Kulczak-Jastrzębska, Magda
We present observations of the ground state 10,1-00,0 rotational transition of HDO at 464.925 GHz and the 11,0-10,1 transition at 509.292 GHz, toward three high-mass star-forming regions: G34.26+0.15, W49N, and W51e1/e2, carried out with the Caltech Submillimeter Observatory. For th…
A Universal Transition in Atmospheric Diffusion for Hot Subdwarfs Near 18,000 K
Dalessandro, E.; Salaris, M.; Bedin, L. R. +6 more
In the color-magnitude diagrams of globular clusters, when the locus of stars on the horizontal branch extends to hot temperatures, discontinuities are observed at colors corresponding to ∼12,000 and ∼18,000 K. The former is the “Grundahl jump” that is associated with the onset of radiative levitation in the atmospheres of hot subdwarfs. The latte…
Observations of multiharmonic ion cyclotron waves due to inverse ion cyclotron damping in the northern magnetospheric cusp
Gunell, H.; Slapak, R.; Hamrin, M.
We present a case study of inverse ion cyclotron damping taking place in the northern terrestrial magnetospheric cusp, exciting waves at the ion cyclotron frequency and its harmonics. The ion cyclotron waves are primarily seen as peaks in the magnetic-field spectral densities. The corresponding peaks in the electric-field spectral densities are no…
Least Squares Image Estimation for Large Data in the Presence of Noise and Irregular Sampling
Piazzo, Lorenzo
Interpretation of a Variable Reflection Nebula Associated with HBC 340 and HBC 341 in NGC 1333
Hillenbrand, L. A.; Dahm, S. E.
We present multi-epoch, R-band imaging obtained from the Palomar Transient Factory of a small, fan-shaped reflection nebula in NGC 1333 that experiences prominent brightness fluctuations. Photometry of HBC 340 (K7e) and HBC 341 (M5e), a visual pair of late-type, young stellar objects lying near the apex of the nebula, demonstrates that while both …
The Radial Distribution of Mono-metallicity Populations in the Galactic Disk as Evidence for Two-phase Disk Formation
Domínguez-Tenreiro, R.; Obreja, A.; Brook, C. B. +2 more
Recent determinations of the radial distributions of mono-metallicity populations (MMPs, I.e., stars in narrow bins in [Fe/H] within wider [α/Fe] ranges) by the SDSS-III/APOGEE DR12 survey cast doubts on the classical thin- and thick-disk dichotomy. The analysis of these observations led to the non-[α /Fe] enhanced populations splitting into MMPs …
The supersoft X-ray source in V5116 Sagittarii . I. The high resolution spectra
Greiner, J.; Hernanz, M.; Sala, G. +1 more
Context. Classical nova explosions occur on the surface of an accreting white dwarf in a binary system. After ejection of a fraction of the envelope and when the expanding shell becomes optically thin to X-rays, a bright source of supersoft X-rays arises, powered by residual H burning on the surface of the white dwarf. While the general picture of…
Thermal Modeling of Comet-like Objects from AKARI Observation
Usui, Fumihiko; Ishiguro, Masateru; Bach, Yoonsoo P.
We investigated the physical properties of the comet-like objects 107P/(4015) Wilson-Harrington (4015WH) and P/2006 HR30 (Siding Spring; HR30) by applying a simple thermophysical model to the near-infrared spectroscopy and broadband observation data obtained by the AKARIsatellite of JAXA when they showed no detectable comet-like activity. We selec…
The hierarchical triple system DY Lyncis
Lehmann, H.; Kamiński, K.; Dimitrov, W. +3 more
We present the results of a six-year spectroscopic monitoring of DY Lyncis. Three different echelle spectrographs were used to collect the spectroscopic data. Each DY Lyncis spectrum contains lines of three different stars. Two of them belong to a very close eclipsing binary (EB) with an orbital period of 1.3 d. The reflex motion due to the third …
Oscillations in the 45 - 5000 MHz Radio Spectrum of the 18 April 2014 Flare
Monstein, Christian; Rybák, Ján; Karlický, Marian
Using a new type of oscillation map, made from the radio spectra by the wavelet technique, we study the 18 April 2014 M7.3 flare (SOL2014-04-18T13:03:00L245C017). We find a quasi-periodic character of this flare with periods in the range 65 - 115 seconds. At the very beginning of this flare, in connection with the drifting pulsation structure (pla…