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A Tale of Two Impostors: SN2002kg and SN1954J in NGC 2403
Van Dyk, Schuyler D.; Humphreys, Roberta M.; Davidson, Kris +1 more
We describe new results on two supernova impostors in NGC 2403, SN 1954J(V12) and SN 2002kg(V37). For the famous object SN 1954J, we combine four critical observations: its current SED, its Hα emission line profile, the Ca II triplet in absorption in its red spectrum, and the brightness compared to its pre-event state. Together, these strongly sug…
The 26 December 2001 Solar Eruptive Event Responsible for GLE63. II. Multi-Loop Structure of Microwave Sources in a Major Long-Duration Flare
Kochanov, A. A.; Kiselev, V. I.; Uralov, A. M. +1 more
Our analysis of the observations of the SOL2001-12-26 event, which was related to ground-level enhancement of cosmic-ray intensity GLE63, including microwave spectra and images from the Nobeyama Radioheliograph at 17 and 34 GHz, from the Siberian Solar Radio Telescope at 5.7 GHz, and from the Transition Region and Coronal Explorer in 1600 Å, has l…
Investigating prominence turbulence with Hinode SOT Dopplergrams
Ichimoto, K.; Matsumoto, T.; Hillier, A.
Quiescent prominences host a diverse range of flows, including Rayleigh-Taylor instability driven upflows and impulsive downflows, and so it is no surprise that turbulent motions also exist. As prominences are believed to have a mean horizontal guide field, investigating any turbulence they host could shed light on the nature of magnetohydrodynami…
Hierarchical Probabilistic Inference of the Color-Magnitude Diagram and Shrinkage of Stellar Distance Uncertainties
Leistedt, Boris; Hogg, David W.
We present a hierarchical probabilistic model for improving geometric stellar distance estimates using color-magnitude information. This is achieved with a data-driven model of the color-magnitude diagram, not relying on stellar models but instead on the relative abundances of stars in color-magnitude cells, which are inferred from very noisy magn…
ALMA Observations of the Gravitational Lens SDP.9
Tamura, Yoichi; Oguri, Masamune; Matsushita, Satoki +3 more
We present long-baseline ALMA observations of the strong gravitational lens H-ATLAS J090740.0-004200 (SDP.9), which consists of an elliptical galaxy at {z}{{L}}=0.6129 lensing a background submillimeter galaxy into two extended arcs. The data include Band 6 continuum observations, as well as CO J = 6-5 molecular line observations, from …
Radar sounding of Lucus Planum, Mars, by MARSIS
Rossi, Angelo Pio; Orosei, Roberto; Cartacci, Marco +6 more
Lucus Planum, extending for a radius of approximately 500 km around 181°E, 5°S, is part of the Medusae Fossae Formation (MFF), a set of several discontinuous deposits of fine-grained, friable material straddling across the Martian highland-lowland boundary. The MFF has been variously hypothesized to consist of pyroclastic flows, pyroclastic airfal…
Discovery of a Metal-poor, Luminous Post-AGB Star that Failed the Third Dredge-up.
Wood, P. R.; Asplund, M.; Van Winckel, H. +3 more
Post-asymptotic giant branch (post-AGB) stars are known to be chemically diverse. In this paper we present the first observational evidence of a star that has failed the third dredge-up (TDU). J005252.87-722842.9 is an A-type (T eff = 8250 ± 250 K) luminous (8200 ± 700 L ⊙) metal-poor ([Fe/H] = -1.18 ± 0.10) low-mass (M …
Orbital period changes in RW CrA, DX Vel and V0646 Cen
Chochol, D.; Mašek, M.; Volkov, I. M. +2 more
We aim to determine the absolute parameters of the components of southern Algol-type binaries with deep eclipses RW CrA, DX Vel, V0646 Cen and interpret their orbital period changes. The data analysis is based on a high quality Walraven photoelectric photometry, obtained in the 1960-70s, our recent CCD photometry, ASAS (Pojmanski, 2002), and Hippa…
GRAVITY Spectro-interferometric Study of the Massive Multiple Stellar System HD 93206 A
Henning, Th.; van Boekel, R.; Brandner, W. +9 more
Characterization of the dynamics of massive star systems and the astrophysical properties of the interacting components are a prerequisite for understanding their formation and evolution. Optical interferometry at milliarcsecond resolution is a key observing technique for resolving high-mass multiple compact systems. Here, we report on Very Large …
Major achievements of the Rosetta mission in connection with the origin of the solar system
Barucci, M. A.; Fulchignoni, M.
Comets have been studied from a long time and are believed to preserve pristine materials, so they are fundamental to understand the origin of the solar system and life. Starting in the early 1990s, ESA decided to have a more risky and fantastic mission to a comet. As Planetary Cornerstone mission of the ESA Horizon 2000 program, the Rosetta missi…