Search Publications
Photospheric and coronal magnetic fields in six magnetographs. II. Harmonic scaling of field intensities
Mursula, Kalevi; Virtanen, Ilpo
Context. Photospheric magnetic fields have been observed since the 1970s by several ground-based and satellite instruments. While the different instruments show a fairly similar large-scale structure and temporal evolution of the photospheric magnetic field, the magnetic field intensity varies significantly between the observations.
Aims: We …
Understanding EROS2 observations toward the spiral arms within a classical Galactic model framework
Moniez, M.; Rahvar, S.; Ansari, R. +2 more
Aims: EROS (Expérience de Recherche d'Objets Sombres) has searched for microlensing toward four directions in the Galactic plane away from the Galactic center. The interpretation of the catalog optical depth is complicated by the spread of the source distance distribution. We compare the EROS microlensing observations with Galactic models (in…
Herschel/HIFI spectral line survey of the Orion Bar. Temperature and density differentiation near the PDR surface
Nagy, Z.; Bergin, E. A.; Gerin, M. +7 more
Context. Photon dominated regions (PDRs) are interfaces between the mainly ionized and mainly molecular material around young massive stars. Analysis of the physical and chemical structure of such regions traces the impact of far-ultraviolet radiation of young massive stars on their environment.
Aims: We present results on the physical and ch…
Chemical tagging of the Ursa Major moving group. A northern selection of FGK stars
Montes, D.; González Hernández, J. I.; Tabernero, H. M. +1 more
Context. Stellar kinematic groups are kinematically coherent groups of stars that might have a common origin. These groups spread through the Galaxy over time owing to tidal effects caused by Galactic rotation and disk heating. However, the chemical information survives these processes.
Aims: The information provided by analysis of chemical e…
Modeling dust emission in the Magellanic Clouds with Spitzer and Herschel
Gordon, Karl D.; Bot, Caroline; Chastenet, Jérémy +4 more
Context. Dust modeling is crucial to infer dust properties and budget for galaxy studies. However, there are systematic disparities between dust grain models that result in corresponding systematic differences in the inferred dust properties of galaxies. Quantifying these systematics requires a consistent fitting analysis.
Aims: We compare th…
Cluster and field elliptical galaxies at z 1.3. The marginal role of the environment and the relevance of the galaxy central regions
Marchesini, D.; Gargiulo, A.; Saracco, P. +1 more
Aims: The aim of this work is twofold: first, to assess whether the population of elliptical galaxies in cluster at z 1.3 differs from the population in the field and whether their intrinsic structure depends on the environment where they belong; second, to constrain their properties 9 Gyr back in time through the study of their scaling relat…
Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub
Bernard, J. -P.; Hill, T.; White, G. J. +29 more
We present far-infrared observations of Monoceros R2 (a giant molecular cloud at approximately 830 pc distance, containing several sites of active star formation), as observed at 70 µm, 160 µm, 250 µm, 350 µm, and 500 µm by the Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Rec…
Detailed abundances from integrated-light spectroscopy: Milky Way globular clusters
Larsen, S. S.; Strader, J.; Brodie, J. P.
Context. Integrated-light spectroscopy at high spectral resolution is rapidly maturing as a powerful way to measure detailed chemical abundances for extragalactic globular clusters (GCs).
Aims: We test the performance of our analysis technique for integrated-light spectra by applying it to seven well-studied Galactic GCs that span a wide rang…
Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature
Lindgren, Sara; Heiter, Ulrike
Context. Reliable metallicity values for late K and M dwarfs are important for studies of the chemical evolution of the Galaxy and advancement of planet formation theory in low-mass environments. Historically it has been challenging to determine the stellar parameters of low-mass stars because of their low surface temperature, which causes several…
Transition from eruptive to confined flares in the same active region
Aulanier, G.; Schmieder, B.; Chandra, R. +2 more
Context. Solar flares are sudden and violent releases of magnetic energy in the solar atmosphere that can be divided into two classes: eruptive flares, where plasma is ejected from the solar atmosphere resulting in a coronal mass ejection (CME), and confined flares, where no CME is associated with the flare.
Aims: We present a case study show…