Search Publications
New Approach to Study Extended Evolution of Supergranular Flows and Their Advection of Magnetic Elements
De Rosa, Marc; Toomre, Juri; Lisle, Jason
Using velocity and magnetogram data extracted from the full-disk field of view of MDI during the 1999 Dynamics Program, we have studied the dynamics of small-scale magnetic elements (3-7 Mm in size) over time periods as long as six days while they are readily visible on the solar disk. By exploiting concurrent time series of magnetograms and Doppl…
Mapping the star formation history of Mrk 86. I. Data and models
Gallego, J.; Zamorano, J.; Gil de Paz, A. +1 more
We have obtained optical (BVR, [O Iii]lambda 5007 Å and Hα ), near infrared (JHK) imaging and long-slit optical spectroscopy for the Blue Compact Dwarf galaxy
HV Ursae Majoris, a new contact binary with early-type components
Kiss, L. L.; Alfaro, E. J.; Csák, B. +1 more
We present the first UBV and uvby photometric observations for the short period variable star HV Ursae Majoris classified as a field RRc variable. The observed differences between the consecutive minima and the lack of colour variations disagree with the RRc-classification and suggest the possible binary nature of HV UMa. In order to reveal the re…
Multi-wavelength observations and modelling of shock-cloud interaction regions in the Vela Supernova Remnant
Bocchino, F.; Sciortino, S.; Raymond, J. +1 more
We present optical photometric and spectrophotometric observations of two selected filaments near the North rim of the Vela supernova remnant also observed in UV with the International Ultraviolet Explorer, and in X-rays with the ROSAT PSPC detector. From the optical data, we have derived spatially-resolved ( ~ 3'') profiles of several …
Detection and Mapping of Decoupled Stellar and Ionized Gas Structures in the Ultraluminous Infrared Galaxy IRAS 12112+0305
Arribas, Santiago; Colina, Luis; Borne, Kirk D. +1 more
Integral field optical spectroscopy with the INTEGRAL fiber-fed system and Hubble Space Telescope optical imaging are used to map the complex stellar and warm ionized gas structure in the ultraluminous infrared galaxy IRAS 12112+0305. Images reconstructed from wavelength-delimited extractions of the integral field spectra reveal that the observed …
Solar Cycle Variations of Large-Scale Flows in the sun
Basu, Sarbani; Antia, H. M.
Using data from the Michelson Doppler Imager (MDI) instrument on board the Solar and Heliospheric Observatory (SOHO), we study the large-scale velocity fields in the outer part of the solar convection zone using the ring diagram technique. We use observations from four different times to study possible temporal variations in flow velocity. We find…
The INES system. II. Ripple correction and absolute calibration for IUE high resolution spectra
Talavera, A.; Altamore, A.; Wamsteker, W. +4 more
In this paper we document the results of the study which led to the ripple correction and absolute calibration algorithms applied to the high resolution spectra processed with the NEWSIPS software for the Final Archive of the IUE Project. In this analysis, based on a very large number of spectra, we find that both the K and alpha parameters (not o…
VLBI observations of two single dMe stars: spatial resolution and astrometry
Güdel, M.; Benz, A. O.; Conway, J. E. +1 more
We report on 3.6 cm VLA and VLBA observations of
X1908+075: An X-Ray Binary with a 4.4 Day Period
Remillard, Ronald A.; Wen, Linqing; Bradt, Hale V.
X1908+075 is an optically unidentified and highly absorbed X-ray source that appeared in early surveys such as Uhuru, OSO 7, Ariel 5, HEAO-1, and the EXOSAT Galactic Plane Survey. These surveys measured a source intensity in the range 2-12 mcrab at 2-10 keV, and the position was localized to ~0.5d. We use the Rossi X-Ray Timing Explorer (RXTE) All…
Oxygen freeze-in temperatures measured with SOHO/CELIAS/CTOF
Bochsler, P.; Grünwaldt, H.; Hefti, S. +1 more
We use the charge time-of-flight (CTOF) mass and charge spectrometer of the charge, element, and isotope analysis system (CELIAS) on board the Solar and Heliospheric Observatory (SOHO) to determine the solar wind oxygen freeze-in temperature T76 from the O7+ and O6+ abundance ratios in the period from days 92 to 22…