Search Publications
Spectrophotometric variability of the magnetic CP star 56 Arietis in spectral region from 1950 to 3200 Å
Sokolov, Nikolay A.
The spectrophotometric variability of the magnetic CP star 56 Arietis (56 Ari) in the ultraviolet spectral region from 1950 to 3200 Å is investigated. This study is based on the archival International Ultraviolet Explorer data obtained at different phases of the rotational cycle. The brightness of 56 Ari is not constant in the investigated wavelen…
The red-giant CoRoT target HR 7349
Auvergne, M.; Eggenberger, P.; Baudin, F. +19 more
HR 7349 is a bright [V=5.8] red giant observed by CoRoT in the seismofield of the first long run. The outstanding CoRoT light curve allowed the detection of several solar-like oscillation modes (both radial and non-radial). On top of these seismic constraints, our observational knowledge on HR 7349 benefits as well from a precise parallax and deta…
CoRoT observations of the young open cluster Dolidze 25
Prada Moroni, P. G.; Degl'Innocenti, S.; Gandolfi, D. +27 more
We present some preliminary results based on the CoRoT observations of the young distant cluster Dolidze 25. The light curve for the 28 stars observed by the satellite have been analyzed and the relevant periodogram presented. As a result we have found two binary, three Pulsating Be, three SPB, two Spotted and one ellipsoidal variables. Noteworthy…
Spectral behavior of AM Her and QQ Vul in high and intermediate states in the UV
Sanad, M. R.
We present low resolution UV spectra of two polar systems, AM Her and QQ Vul from the observations taken by the IUE (International Ultraviolet Explorer) of the period between 1978–1996 and 1983–1996 for both systems respectively, to accomplish a large scale study of what happens to the ultraviolet flux of C IV 1550 Å spectral line during different…
Organic matter in space: from star dust to the Solar System
Kwok, Sun
Organic compounds of high degree of complexity are now known to be widespread in the Universe, ranging from objects in our Solar System to distant galaxies. Through the techniques of millimeter-wave spectroscopy, over 140 molecules have been identified through their rotational transitions. Space infrared spectroscopy has detected the stretching an…
On properties of narrow CMEs observed with SOHO/LASCO
Mittal, Nishant; Narain, Udit; Pandey, Kumud +1 more
We have investigated properties such as speed, angular width, location, acceleration and occurrence rate of narrow CMEs (defined as having angular width ≤20°) observed during 1996–2007 by SOHO/LASCO. The results obtained are compared with those of normal CMEs (angular width >20°) from the same time interval to find whether there are any real di…
Optical and UV monitor (OM) on-board XMM-Newton
Talavera, Antonio; OMCal Team
The Optical and UV Monitor (OM), is a small telescope co-aligned with the main XMM-Newton X-ray telescopes. It can perform imaging with six broad band lenticular filters covering the range 180 nm to 600 nm. In addition, two grisms allow the user to obtain low resolution spectra in the same range. The detector is an intensified CCD. The instrument …
Initial mass function biases created by binning and unresolved systems
Maíz Apellániz, Jesús
I discuss two of the possible sources of biases in the determination of the stellar initial mass function: binning and the existence of unresolved components. The first source is important for clusters with a small number of stars detected in a given mass bin, while the second is relevant for all clusters located beyond the immediate solar neighbo…
A Hubble Space Telescope/NICMOS view of the prototypical giant H ii region NGC604 in M33
Walborn, Nolan R.; Bolatto, Alberto; Barbá, Rodolfo H. +5 more
We present the first high-spatial-resolution near-infrared (NIR) imaging of NGC604, obtained with the NICMOS camera onboard the Hubble Space Telescope (HST). These NICMOS broad-band images reveal new NIR point sources, clusters, and diffuse structures. We find an excellent spatial correlation between the 8.4 GHz radio continuum and the 2.2 µ…
Very peculiar wind from BD+53°2790, the optical counterpart to 4U 2206+54
Negueruela, I.; Ribó, M.; Blay, P.
BD+53°2790, an O9.5V star, is the optical counterpart to the HMXRB 4U 2206+54. This system was classified initially as a BeX, but observational evidence soon stressed the need to revise this classification. The permanent asymmetry in the Hα line profiles (in contrast with the cyclic variations shown by Be stars), the variations in the profile of t…