Search Publications
A catalogue of intermediate-duration Type I X-ray bursts observed with the INTEGRAL satellite
Lund, N.; Chenevez, J.; Brandt, S. +1 more
We present a catalogue of long-duration bursts observed with the Joint European X-ray Monitor and IBIS/ISGRI instruments onboard the INTEGRAL satellite. The 14 bursts have e-folding times ranging from 55 s to ≈17 min, and are therefore classified as intermediate-duration bursts, caused by the ignition of an unusually thick helium layer. Though sev…
Pre-main-sequence Stars in Taurus: Comparison of Magnetic and Nonmagnetic Model Fits to the Low-mass Stars
Mullan, D. J.; MacDonald, J.
Stellar associations should be co-eval, but some associations exhibit apparently discrepant ages: M stars appear younger than FG stars. Among M stars in the Upper Sco association (age ≈ 11 Myr), magnetic effects have been shown to slow down evolution of the lowest mass stars, thereby alleviating the age discrepancy. A recent study of pre-main-sequ…
On the Relationship Between the Transit Time of ICMEs and Strength of the Initiated Geomagnetic Storms
Chertok, I. M.
More than 140 isolated non-recurrent geomagnetic storms (GMSs) of various intensities from extreme to weak are considered; these are reliably identified with solar eruptive sources (coronal mass ejections, CMEs). The analysis aims to obtain a possibly complete picture of the relationship between the transit time of propagation of CMEs and interpla…
Investigation of near-contact semi-detached binary WUMi through observations and evolutionary models
Soydugan, Faruk; Soydugan, Esin; Aliçavuş, Fahri
W UMi is a near contact, semi-detached, double-lined eclipsing binary star with an orbital period of 1.7 d. Simultaneous analysis of new BV R multi-color light curves and radial velocity data yields the main astrophysical parameters of the binary and its component stars. We determined mass and radius to be M1 = 3.22 ± 0.08 M⊙…
A new multiwavelength census of blazars
Villata, M.; De Zotti, G.; Carnerero, M. I. +3 more
Context. Blazars are the rarest and most powerful active galactic nuclei. They play a crucial and expanding role in the multifrequency and multimessenger astrophysics of today. Dominating the high-energy extragalactic sky, they have been recently associated with high-energy astrophysical neutrinos and they may be among the accelerators of the ultr…
Detection and characterization of two VLM binaries: LP 1033-31 and LP 877-72
Karmakar, Subhajeet; Homeier, D.; Allard, F. +1 more
Using the high-resolution near-infrared adaptive optics imaging from the NaCo instrument at the Very Large Telescope, we report the discovery of a new binary companion to the M-dwarf LP 1033-31 and also confirm the binarity of LP 877-72. We have characterized both the stellar systems and estimated the properties of their individual components. We …
Basaltic fissure types on Earth: Suitable analogs to evaluate the origins of volcanic terrains on the Moon and Mars?
Kobs Nawotniak, Shannon E.; Hughes, Scott S.; Elphic, Richard C. +6 more
Basaltic eruptive fissures of the Great Rift and surroundings on the eastern Snake River Plain of Idaho, USA, and selected volcanic features in Hawai'i, Iceland and northern Africa were surveyed for their relevancy as planetary analogs. Evaluated during field investigations and in satellite imagery for structures, physiography, and geologic settin…
Linking studies of tiny meteoroids, zodiacal dust, cometary dust and circumstellar disks
Lasue, J.; Milli, J.; Levasseur-Regourd, A. C. +2 more
Tiny meteoroids entering the Earth's atmosphere and inducing meteor showers have long been thought to originate partly from cometary dust. Together with other dust particles, they form a huge cloud around the Sun, the zodiacal cloud. From our previous studies of the zodiacal light, as well as other independent methods (dynamical studies, infrared …
Contribution of a Non-Thermal Component to the X-Ray Emission of OB Stars
Kholtygin, A. F.; Ryspaeva, E. B.
—In the paper the possibility of the presence of a non-thermal component described by a power law spectrum in the X-ray spectra of OB stars is investigated. The low-resolution spectra of 101 OB stars obtained using the EPIC camera on the XMM satellite are analyzed. It is concluded that the contribution of the non-thermal component of X-ray emissio…
Mapping the working of environmental effects in A963
Hwang, Ho Seong; Finoguenov, Alexis; Ziegler, Bodo +5 more
Aims: We qualitatively assess and map the relative contribution of pre-processing and cluster related processes to the build-up of
Methods: We use Voronoi binning of positions of cluster members on the plane …