Search Publications
Discovery of complex narrow X-ray absorption features from the low-mass X-ray binary GX 13+1 with XMM-Newton
Parmar, A. N.; Sidoli, L.; Oosterbroek, T. +1 more
We report the detection of a complex of narrow X-ray absorption features from the low-mass X-ray binary GX 13+1 during 3 XMM-Newton observations in 2000 March and April. The features are consistent with being due to resonant scattering of the Kalpha and Kbeta lines of He- and H-like iron (Fe XXV and Fe XXVI) and H-like calcium (Ca XX) Kalpha . Onl…
The circumstellar dust shell of the post-AGB star HD 161796
Waters, L. B. F. M.; Dominik, C.; Barlow, M. J. +3 more
We have modeled the complete optical to millimeter spectrum of the Post-Asymptotic Giant Branch (Post-AGB) star HD 161796 and its circumstellar dust shell. A full 2-200 mu m spectrum taken with the Infrared Space Observatory was used to constrain the dust properties. A good fit is achieved using only 4 dust components: amorphous silicates, the cry…
ISOCAM observations of the Ursa Major cirrus:. Evidence for large abundance variations of small dust grains
Miville-Deschênes, M. -A.; Boulanger, F.; Falgarone, E. +1 more
We present mid-IR imaging observations of a high Galactic latitude cirrus obtained with the ISO camera ISOCAM at 6'' angular resolution. The observations were done with two filters LW2 (5-8.5 mu m) and LW3 (12-18 mu m) that measure respectively the aromatic carbon bands and the underlying continuum emission from small dust particles. Three 0.05 sq…
The mineral composition and spatial distribution of the dust ejecta of NGC 6302
Waters, L. B. F. M.; Molster, F. J.; Kemper, F. +1 more
We have analysed the full ISO spectrum of the planetary nebula
Statistics of galaxy warps in the HDF North and South
Battaner, E.; Combes, F.; Jiménez-Vicente, J. +1 more
We present a statistical study of the presence of galaxy warps in the Hubble deep fields. Among a complete sample of 45 edge-on galaxies above a diameter of 1\farcs3, we find 5 galaxies to be certainly warped and 6 galaxies as good candidates. In addition, 4 galaxies reveal a characteristic U-warp. Compared to statistical studies of local warps, a…
An inverse method to interpret colour-magnitude diagrams
Bienaymé, O.; Egret, D.; Vergely, J. -L. +1 more
An inverse method is developed to determine the star formation history, the age-metallicity relation, and the IMF slope from a colour-magnitude diagram. The method is applied to the Hipparcos HR diagram. We found that the thin disk of our Galaxy shows a peak of stellar formation 1.6 Gyr ago. The stars close to the Sun have a solar metallicity and …
An XMM-Newton observation of the Lagoon Nebula and the very young open cluster NGC 6530
Gosset, E.; Corcoran, M. F.; Blomme, R. +5 more
We report the results of an XMM-Newton observation of the Lagoon Nebula (M 8). Our EPIC images of this region reveal a cluster of point sources, most of which have optical counterparts inside the very young open cluster NGC 6530. The bulk of these X-ray sources are probably associated with low and intermediate mass pre-main sequence stars. One of …
Extragalactic globular clusters in the near infrared. I. A comparison between M87 and NGC 4478
Minniti, D.; Kissler-Patig, M.; Brodie, J. P.
We compare optical and near infrared colours of globular clusters in M87, the central giant elliptical in Virgo, and NGC 4478, an intermediate luminosity galaxy in Virgo, close in projection to M87. Combining V and I photometry obtained with the WFPC2 on HST and K_s photometry obtained with the NIRC on Keck 1, we find the broad range in colour and…
The young intermediate-mass stellar object AFGL 490 - A disk surrounded by a cold envelope
Henning, Th.; van Dishoeck, E. F.; van der Tak, F. F. S. +2 more
AFGL 490 is a key target of the class of deeply embedded intermediate-mass young stellar objects in a transition stage to Herbig Be stars (L = 2.2-4.0 x 103 Lsun ). In this paper, we present a comprehensive set of single-dish line data which characterize the envelope of the source. In addition, observations of CS J = 2->1 …
Far-infrared emission from intracluster dust in Abell clusters
Lemke, D.; Klaas, U.; Mattila, K. +1 more
The ISOPHOT instrument aboard ISO has been used to observe extended FIR emission of six Abell clusters. Strip scanning measurements with crossing position angles centered on the clusters were carried out at 120 µ m and 180 µ m. The raw profiles of the I120 µ m/I180 µ m surface brightness ratio includin…