Search Publications
Detection of a classical δ Scuti star in the new eclipsing binary system HIP 7666
García-Melendo, E.; Gómez-Forrellad, J. M.; Lampens, P. +4 more
HIP 7666 is a variable star newly discovered during the Hipparcos mission and classified as of unknown type (ESA 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200). During 23 nights between July 2000 and November 2000, over 2300 CCD observations in the V band were obtained. These data show that the new variable is a detached eclipsing binary s…
Mid-IR spectro-imaging observations with the ISOCAM CVF: Final reduction and archive
Blommaert, J. A. D. L.; Boulanger, F.; Abergel, A. +6 more
Mid-IR (5-17~µm) Spectro-Imaging observations towards several hundred sky positions were obtained with the Infrared Space Observatory Camera (ISOCAM), and a Circular Variable Filter (CVF) that provided spectral resolution R = λ/Δ λ ~ 45 over a 3' × 3' field (for 6, and 12´´ pixels, proportionally smaller for the observations carried with the…
Solar hydrogen-Lyman continuum observations with SOHO/SUMER
Vial, J. -C.; Parenti, S.; Lemaire, P.
In this work we analyze the emission of the H Lyman continuum (HI LyC) in the Quiet Sun (QS) and a solar prominence, in order to derive information on the temperature of the emitting plasma. We used the spectral atlas obtained with SOHO/SUMER detector A in 1999 (Parenti et al. 2005, A&A, 443, 679). The high spectral resolution of this instrume…
The influence of internal magnetic layers on the frequencies of solar p-modes
Foullon, C.; Roberts, B.
Buried magnetic fields at the base of the convection zone and in the anchoring zones of sunspots are presumed to vary over the solar activity cycle. Their effect on p-mode oscillations is explored in detail, through theoretical modelling. The helioseismic signature from a "tachocline" or "shallow" horizontal layer of magnetic field, buried in a pl…
Line broadening of EUV lines across the Solar limb: A spicule contribution?
Doyle, J. G.; Madjarska, M. S.; Xia, L. D. +1 more
Spectral lines formed in the solar transition region show an increase in the line width, peaking at ≈10 000 km above the limb. Looking at a region off-limb with no obvious spicules, the non-spicule region has a significantly smaller line width above 6000 km compared those taken in a spicule region. We suggest that this increase in line broadening …
Blinker/macro-spicule activity in an off-limb polar region
Doyle, J. G.; Banerjee, D.; O'Shea, E.
Using measurements of O V 629.73 Å from the Coronal Diagnostic Spectrometer (CDS) on board SOHO we report on blinker activity in off-limb regions above the Northern pole of the Sun. The blinkers are found to be occurring above a region showing strong dynamic activity, with evidence for evacuation of plasma. The presence of blinkers is discussed in…
<sl>Chandra</sl> and RXTE spectroscopy of the accreting msec pulsar IGR J00291+5934
Nowak, M. A.; Rodriguez, J.; Wilms, J. +4 more
We report on an observation of the recently discovered accreting millisecond X-ray pulsar IGR J00291+5934 performed with the RXTE-Proportional Counter Array (PCA) and <sl>Chandra</sl>-High Energy Transmission Grating Spectrometer (HETGS). The RXTE data are from a two-week follow-up of the source, while the <sl>Chandra</sl> …
Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033
Battaner, E.; Arribas, S.; García-Lorenzo, B. +5 more
We present integral field spectroscopy of NGC 5033, a low luminosity Seyfert galaxy. The observations were made with INTEGRAL, a fiber based system operating at the WHT. The intensity map of the Hβ emission line represents a spiral or ring-like pattern of HII regions. On the contrary, the [OIII] intensity map morphology is markedly anisotropic. Th…
Galaxy populations of double cluster RX J1053.7+5735 at z = 1.13
Hasinger, G.; Schmidt, M.; Hashimoto, Yasuhiro +2 more
We present a study of the galaxy population in the cluster RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies and one which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hol…
INTEGRAL observations of the Be/X-ray binary EXO 2030+375 during outburst
Connell, P.; Beckmann, V.; Blay, P. +4 more
We present a type-I outburst of the high-mass X-ray binary EXO 2030+375, detected during INTEGRAL's Performance and Verification phase in December 2002 (on-source time about 106 s). In addition, six more outbursts have been observed during INTEGRAL's Galactic Plane Scans. X-ray pulsations have been detected with a pulse period of 41.691…