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The VMC survey. III. Mass-loss rates and luminosities of LMC AGB stars
van Loon, J. Th.; Gullieuszik, M.; Girardi, L. +7 more
Context. Asymptotic giant branch (AGB) stars are major contributors to both the chemical enrichment of the interstellar medium and the integrated light of galaxies. Despite its importance, the AGB is one of the least understood phases of stellar evolution. The main difficulties associated with detailed modelling of the AGB are related to the mass-…
Suzaku Observation of the Black Hole Candidate Maxi J1836-194 in a Hard/Intermediate Spectral State
Fabian, A. C.; Miller, J. M.; Reis, R. C. +2 more
We report on a Suzaku observation of the newly discovered X-ray binary MAXI J1836-194. The source is found to be in the hard/intermediate spectral state and displays a clear and strong relativistically broadened iron emission line. We fit the spectra with a variety of phenomenological, as well as physically motivated disk reflection models, and fi…
XMM-Newton observations of SNR 1987A. II. The still increasing X-ray light curve and the properties of Fe K lines
Haberl, F.; Sturm, R.; Maggi, P. +1 more
Aims: We report on the recent observations of the supernova remnant
Methods: We analysed all X…
The 2.35 year itch of Cygnus OB2 #9. I. Optical and X-ray monitoring
Absil, O.; Damerdji, Y.; Blomme, R. +5 more
Context. Nonthermal radio emission in massive stars is expected to arise in wind-wind collisions occurring inside a binary system. One such case, the O-type star Cyg OB2 #9, was proven to be a binary only four years ago, but the orbital parameters remained uncertain. The periastron passage of 2011 was the first one to be observable under good cond…
High-contrast Near-infrared Polarization Imaging of MWC480
Kuzuhara, M.; Tamura, M.; Ishii, M. +52 more
One of the key predictions of modeling from the IR excess of Herbig Ae stars is that for protoplanetary disks, where significant grain growth and settling has occurred, the dust disk has flattened to the point that it can be partially or largely shadowed by the innermost material at or near the dust sublimation radius. When the self-shadowing has …
The first X-ray survey of Galactic luminous blue variables
Nazé, Y.; Rauw, G.; Hutsemékers, D.
Aims: The X-ray emission of massive stars has been studied when these objects are in their main-sequence phase, as well as when they are in their Wolf-Rayet phase. However, the X-ray properties of the transitional luminous blue variable (LBV) phase remain unknown.
Methods: Using a dedicated but limited XMM-Newton survey and archival XMM-…
Herschel observations of a potential core-forming clump: Perseus B1-E
Bernard, J. -P.; Hill, T.; White, G. J. +17 more
We present continuum observations of the Perseus B1-E region from the Herschel Gould Belt Survey. These Herschel data reveal a loose grouping of substructures at 160-500 µm not seen in previous submillimetre observations. We measure temperature and column density from these data and select the nine densest and coolest substructures for follo…
Densities and temperatures in the Venus mesosphere and lower thermosphere retrieved from SOIR on board Venus Express: Carbon dioxide measurements at the Venus terminator
Vandaele, A. C.; Robert, S.; Montmessin, F. +4 more
SOIR is a high-resolution spectrometer flying on board the ESA Venus Express mission. It performs solar occultations of the Venus high atmosphere, and so defines unique vertical profiles of many of the Venus key species. In this paper, we focus on the Venus main constituent, carbon dioxide. We explain how the temperature, the total density, and th…
Detection of the Second r-process Peak Element Tellurium in Metal-poor Stars
Beers, Timothy C.; Roederer, Ian U.; Frebel, Anna +6 more
Using near-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, we detect neutral tellurium in three metal-poor stars enriched by products of r-process nucleosynthesis, BD +17 3248, HD 108317, and HD 128279. Tellurium (Te, Z = 52) is found at the second r-process peak (A ≈ 130) associated …
The Herschel and IRAM CHESS Spectral Surveys of the Protostellar Shock L1157-B1: Fossil Deuteration
Codella, C.; Ceccarelli, C.; Caselli, P. +9 more
We present the first study of deuteration toward the protostellar shock L1157-B1, based on spectral surveys performed with the Herschel-HIFI and IRAM 30 m telescopes. The L1157 outflow is driven by a low-mass Class 0 protostar and is considered the prototype of the so-called chemically active outflows. The young (2000 yr), bright blueshifted bow s…