Search Publications
Near-infrared photometry of carbon stars in the Sagittarius dwarf irregular galaxy and DDO 210
Rejkuba, M.; Gullieuszik, M.; Held, E. V. +2 more
Aims:We investigate the intermediate-age asymptotic giant branch stellar population of two Local Group dwarf irregular galaxies to characterize their carbon star population in near-infrared (IR).
Methods: Our work is based on near-IR photometry complemented with optical ground based and Hubble Space Telescope (HST) photometry. Near-IR photomet…
Simultaneous XMM-Newton and VLT/UVES observations of the flare star CN Leonis
Liefke, C.; Schmitt, J. H. M. M.; Fuhrmeister, B.
Aims:We present simultaneous observations with VLT/UVES and XMM-Newton of the active M5.5 dwarf CN Leo (Gl 406). The data were gathered during three half nights in May 2004 and December 2005, and they cover quiescent states, as well as flaring activity. Our main aim is to derive coronal properties from X-ray data and to compare these to results fr…
HST and VLT observations of the symbiotic star Hen 2-147. Its nebular dynamics, its Mira variable and its distance
Munari, U.; Corradi, R. L. M.; Santander-García, M. +5 more
Aims:We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the period-luminosity relation for its Mira variable.
Methods: A combination of multi-epoch HST images and VLT integral field high-resolution spectroscopy is used to study the nebul…
XMM-Newton observation of Mrk 110
Balestra, I.; Boller, Th.; Kollatschny, W.
Context: We report on the first XMM-Newton observation of the bright narrow-line Seyfert 1 galaxy Mrk 110.
Aims: Our analysis is aimed to study the properties of the X-ray spectrum of Mrk 110 and compare them with those inferred from optical spectroscopy.
Methods: We make use of detailed timing and spectral analysis as well as high resolut…
Astrometry with Carte du Ciel plates, San Fernando zone. I. Digitization and measurement using a flatbed scanner
Abad, C.; Vicente, B.; Garzón, F.
Context: The historic plates of the Carte du Ciel, an international cooperative project launched in 1887, offers valuable first-epoch material for determining of absolute proper motions.
Aims: We present an original method of digitizing and astrometrically reducing Carte du Ciel plate material using an inexpensive flatbed scanner, to demonstra…
Iron lines from transient and persisting hot spots on AGN accretion disks
Dovčiak, M.; Karas, V.; Mouchet, M. +4 more
Aims:We model the X-ray reprocessing from a strong co-rotating flare above an accretion disk in active galactic nuclei. By performing detailed radiative transfer computations we explore the horizontal structure and evolution of the underlying hot spot. The main goal is to study how the resulting spectral features manifest themselves in short expos…
Long-term pulse profile study of the Be/X-ray pulsar SAX J2103.5+4545
Reglero, V.; Wilson, C. A.; Finger, M. H. +1 more
Aims:We present the first long-term pulse profile study of the X-ray pulsar SAX J2103.5+4545. Our main goal is to study the pulse shape correlation either with luminosity, time or energy.
Methods: This Be/X-ray binary system was observed from 1999 to 2004 by RXTE PCA, and by INTEGRAL from 2002 to 2005, during the Performance and Verification (…
The highly ionized disk wind of GRO J1655-40
Haberl, F.; Greiner, J.; Sala, G. +3 more
Aims:The galactic superluminal microquasar
Methods: We observed
Physical parameters of a mid-latitude streamer during the declining phase of the solar cycle
Susino, R.; Landi, E.; Spadaro, D. +2 more
Context: Investigating the physical properties of solar coronal streamers is important for understanding their role in the global magnetic structure of the extended solar atmosphere, as well as in the generation of the slow solar wind.
Aims: We hope to contribute as completely as possible to the ongoing SOHO instruments campaign devoted to the…
Correlated modulation between the redshifted Fe Kα line and the continuum emission in NGC 3783
Cappi, M.; Ponti, G.; Iwasawa, K. +5 more
Aims:It has been suggested that X-ray observations of rapidly variable Seyfert galaxies may hold the key to probe the gas orbital motions in the innermost regions of accretion discs around black holes and, thus, trace flow patterns under the effect of the hole strong gravitational field.
Methods: We explore this possibility by re-analyzing the…