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A hydrodynamic study of the circumstellar envelope of α Scorpii
Reimers, D.; Hagen, H. -J.; Baade, R. +1 more
Context. Both the absolute mass-loss rates and the mechanisms that drive the mass loss of late-type supergiants are still not well known. Binaries such as α Sco provide the most detailed empirical information about the winds of these stars.
Aims: Our goal was to improve the binary technique for the determination of the mass-loss rate of
The Absence of Cold Dust around Warm Debris Disk Star HD 15407A
Onaka, Takashi; Takita, Satoshi; Fukagawa, Misato +5 more
We report Herschel and AKARI photometric observations at far-infrared (FIR) wavelengths of the debris disk around the F3V star HD 15407A, in which the presence of an extremely large amount of warm dust (~500-600 K) has been suggested by mid-infrared (MIR) photometry and spectroscopy. The observed flux densities of the debris disk at 60-160 µ…
GRB 070912—A gamma-ray burst recorded from the direction to the galactic center
Frederiks, D. D.; Minaev, P. Yu.; Pozanenko, A. S. +3 more
The detection of GRB 070912 recorded in the field of view of the SPI, IBIS/ISGRI, and JEMX telescope on September 12, 2007, at 07h32m19s (UT) when analyzing the INTEGRAL archival data is reported. The burst is one of the well-localized events closest to the direction toward the Galactic center (less than [InlineMed…
Solar Polar X-Ray Jets and Multiple Bright Points: Evidence for Sympathetic Activity
Romoli, Marco; Sterling, Alphonse C.; Pucci, Stefano +1 more
We present an analysis of X-ray bright points (BPs) and X-ray jets observed by Hinode/X-Ray Telescope on 2007 November 2-4, within the solar northern polar coronal hole. After selecting small subregions that include several BPs, we followed their brightness evolution over a time interval of a few hours, when several jets were observed. We find tha…
The OH Venus nightglow spectrum: Intensity and vibrational composition from VIRTIS—Venus Express observations
Drossart, Pierre; Piccioni, Giuseppe; Gérard, Jean-Claude +1 more
Limb spectra of the OH nightglow emission corresponding to the Δv=1 and Δv=2 sequences have been collected with the VIRTIS infrared imaging spectrograph on board Venus Express between April 2006 and October 2008. A detailed statistical analysis shows that the peak intensity and altitude of the two vibrational sequences are significantly correlated…
Low Ionization State Plasma in Coronal Mass Ejections
Raymond, John C.; Lee, Jin-Yi
The Ultraviolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory often observes low ionization state coronal mass ejection (CME) plasma at ultraviolet wavelengths. The CME plasmas are often detected in O VI (3 × 105 K), C III (8 × 104 K), Lyα, and Lyβ, with the low ionization plasma confined to …
Infrared observations of the recurrent nova T Pyxidis: ancient dust basks in the warm glow of the 2011 outburst★
Ness, J. -U.; Gehrz, R. D.; Eyres, S. P. S. +15 more
We present Spitzer Space Telescope and Herschel Space Observatory infrared observations of the recurrent nova T Pyx during its 2011 eruption, complemented by ground-base optical-infrared photometry. We find that the eruption has heated dust in the pre-existing nebulosity associated with T Pyx. This is most likely interstellar dust swept up by T Py…
Mid-infrared spectra of differentiated meteorites (achondrites): Comparison with astronomical observations of dust in protoplanetary and debris disks
Koike, Chiyoe; Mason, Andrew; Morlok, Andreas +4 more
Mid-infrared (5-25 µm) transmission/absorption spectra of differentiated meteorites (achondrites) were measured to permit comparison with astronomical observations of dust in different stages of evolution of young stellar objects. In contrast to primitive chondrites, achondrites underwent heavy metamorphism and/or extensive melting and repre…
Evidence of an interaction from resolved stellar populations: the curious case of NGC 1313
Larsen, S. S.; Silva-Villa, E.
The galaxy NGC 1313 has attracted the attention of various studies due to the peculiar morphology observed in optical bands, although it is classified as a barred, late-type galaxy with no apparent close-by companions. However, the velocity field suggests an interaction with a satellite companion. Using resolved stellar populations, we study diffe…
Spectral analysis and geological mapping of the Daedalia Planum lava field (Mars) using OMEGA data
Massironi, M.; Giacomini, L.; Carli, C. +1 more
The great variety of morphologies observed in the Daedalia Planum lava flows (Mars) encouraged a detailed study of their spectral characteristics, in order to obtain information about lava composition and detect possible differences in the spectra of the flows. The OMEGA spectral data collected from the lava field appear rather similar, with absor…