Search Publications
The protoplanetary disk of FT Tauri: multiwavelength data analysis and modeling
Ménard, F.; Woitke, P.; Kamp, I. +7 more
Context. Investigating the evolution of protoplanetary disks is crucial for our understanding of star and planet formation. There have been several theoretical and observational studies in past decades to advance this knowledge. The launch of satellites operating at infrared wavelengths, such as the Spitzer Space Telescope and the Herschel Space O…
Detection of a dense clump in a filament interacting with W51e2
Persson, C. M.; Gerin, M.; Goldsmith, P. F. +8 more
In the framework of the Herschel/PRISMAS guaranteed time key program, the line of sight to the distant ultracompact H ii region W51e2 has been observed using several selected molecular species. Most of the detected absorption features are not associated with the background high-mass star-forming region and probe the diffuse matter along the line o…
Response of Hinode XRT to quiet Sun, active region and flare plasma
Mason, H. E.; Del Zanna, G.; O'Dwyer, B.
Aims: We examine the response of the Hinode X-Ray Telescope (XRT), using simultaneous observations with the Hinode Extreme-ultraviolet Imaging Spectrometer (EIS), for a flare, an active region and a quiet Sun region. We also examine the relative intensity calibration of EIS and XRT.
Methods: EIS differential emission measure distribution…
Multi-frequency study of DEM L299 in the Large Magellanic Cloud
Sasaki, Manami; Warth, Gabriele; Filipović, Miroslav D. +3 more
Aims: We have studied the H ii region
Methods: We performed a spectral analysis of archived XMM-Newton EPIC data and studied the morphology of
Chandra X-ray observation of the H ii region Gum 31 in the Carina nebula complex
Preibisch, T.; Ratzka, T.; Broos, P. +2 more
Context. Gum 31 is a prominent, but still rather poorly studied H ii region around the stellar cluster NGC 3324 at the northwestern periphery of the Carina nebula complex.
Aims: Our aim was to reveal and characterize the young stellar population in Gum 31. An X-ray survey is the only efficient way to identify young stars in this region with e…
HD 51844: An Am δ Scuti in a binary showing periastron brightening
Baudin, F.; Poretti, E.; Michel, E. +12 more
Context. Pulsating stars in binary systems are ideal laboratories to test stellar evolution and pulsation theory, since a direct, model-independent determination of component masses is possible. The high-precision CoRoT photometry allows a detailed view of the frequency content of pulsating stars, enabling detection of patterns in their distributi…
First spectrally-resolved H2 observations towards HH 54 . Low H2O abundance in shocks
Liseau, R.; Codella, C.; van Dishoeck, E. F. +11 more
Context. Herschel observations suggest that the H2O distribution in outflows from low-mass stars resembles the H2 emission. It is still unclear which of the different excitation components that characterise the mid- and near-IR H2 distribution is associated with H2O.
Aims: The aim is to spectrally r…
A non-LTE spectral analysis of the 3He and 4He isotopes in the HgMn star κ Cancri
Przybilla, Norbert; Maza, Natalia L.; Nieva, María-Fernanda
Aims: We present a pilot study on non-local thermodynamic equilibrium (NLTE) line-formation computations for the isotopes 3He and 4He in the mercury-manganese star κ Cancri. The impact of NLTE effects on the determination of isotopic abundances and the vertical stratification of helium in the atmosphere is investigated. …
Probing large-scale structure with large samples of X-ray selected AGN. I. Baryonic acoustic oscillations
Sunyaev, Rashid; Gilfanov, Marat; Hütsi, Gert +1 more
We investigate the potential of large X-ray-selected AGN samples for detecting baryonic acoustic oscillations (BAO). Though AGN selection in X-ray band is very clean and efficient, it does not provide redshift information, and thus needs to be complemented with an optical follow-up. The main focus of this study is (i) to find the requirements need…
Segmentation of coronal features to understand the solar EUV and UV irradiance variability
Chitta, L. P.; Verbeeck, C.; Giono, G. +8 more
Context. The study of solar irradiance variability is of great importance in heliophysics, the Earth's climate, and space weather applications. These studies require careful identifying, tracking and monitoring of active regions (ARs), coronal holes (CHs), and the quiet Sun (QS).
Aims: We studied the variability of solar irradiance for a peri…