Search Publications
A dynamical study of 12 wide visual binaries
Romanenko, L. G.; Kalinichenko, O. A.; Kisselev, A. A.
We have carried out the first dynamical studies of the relative motions of the components of 12 wide binaries: ADS 497, ADS 2427 (GL 130.1), ADS 3593, ADS 5436, ADS 6646, ADS 6783, ADS 9559 ( δ Boo), ADS 10329, ADS 10759 ( ψ Dra), ADS 14878, ADS 15229, and ADS 16558. The analysis is based on series of photographic observations made with the 26-inc…
Evolution of the optical Tully-Fisher relation up to z = 1.3
Castañeda, H.; Cepa, J.; Bongiovanni, A. +5 more
Context: The study of the evolution of the Tully-Fisher relation has been controversial in the past years. The main difficulty is in determining the required parameters for intermediate and high redshift galaxies, given the cosmological corrections and biases involved.
Aims: This work aims to identify the main problems of the study of the Tull…
Infrared Spectra of C2H6, C2H4, C2H2, and CO2 Aerosols Potentially Formed in Titan's Atmosphere
Wang, Chia C.; Signorell, Ruth; Zielke, Philipp +2 more
Pure and mixed aerosols of ethane, ethylene, acetylene and carbon dioxide were generated in a collisional cooling cell and characterized by Fourier transform infrared spectroscopy between 600 and 4000 cm-1. Pure ethane, pure ethylene, and mixed ethane/ethylene initially form supercooled liquid droplets, which over time crystallize to their stable …
Star formation history of Canis Major R1. I. Wide-Field X-ray study of the young stellar population
Preibisch, T.; Zinnecker, H.; Rodrigues, C. V. +3 more
Aims: The CMa R1 star-forming region contains several compact clusters as well as many young early-B stars. It is associated with a well-known bright rimmed nebula, the nature of which is unclear (fossil HII region or supernova remnant). To help elucidate the nature of the nebula, our goal was to reconstruct the star-formation history of the CMa R…
Interplanetary Lyman α Observations: Intensities from Voyagers and Line Profiles from HST/STIS
Clarke, John T.; Lallement, Rosine; Quémerais, Eric +1 more
We present an analysis of Voyager UVS data obtained between 1993 and mid-2007. These data are used to study the interplanetary background and the hydrogen number density in the outer heliosphere. Two types of observations are studied, first the heliospheric scans performed until 2003 and then the fixed line of sight observations, close to the upwi…
X-ray spectral evolution of the extragalactic Z source LMC X-2
Misra, R.; Agrawal, V. K.
We present the results obtained by a detailed study of the extragalactic Z source LMC X-2, using broad-band Suzaku data and a large (~750ks) data set obtained with the proportional counter array (PCA) onboard the Rossi X-ray Timing Experiment (RXTE). The PCA data allow the study of the complete spectral evolution along the horizontal, normal and f…
Structural Parameters of the Messier 87 Globular Clusters
Blakeslee, John P.; Harris, William E.; Madrid, Juan P. +1 more
We derive structural parameters for ~2000 globular clusters in the giant Virgo elliptical Messier 87 (M87) using extremely deep Hubble Space Telescope images in F606W (V) and F814W (I) taken with the ACS/WFC. The cluster scale sizes (half-light radii rh ) and ellipticities are determined from point-spread-function -convolved King-model …
Key Scientific Questions and Key Investigations from the First International Conference on Martian Phyllosilicates
Mustard, John F.; Bibring, Jean-Pierre; Poulet, François +6 more
Minerals and their occurrences can tell us about the chemistry, pressure, and temperatures of past environments on Mars and thus allow inferences about the potential for habitability. Thanks to recent space exploration, a new vision is emerging wherein Mars hosted environmental conditions of potential astrobiological relevance. This epoch is ident…
ISO observation of molecular hydrogen and fine-structure lines in the photodissociation region IC63
van Dishoeck, E. F.; Bell, T.; Viti, S. +2 more
We wish to constrain the main physical properties of the photodissociation region (PDR) IC63. We present the results of a survey for the lowest pure-rotational lines of H2 with the Short Wavelength Spectrometer and for the major fine-structure cooling lines of OI at 63 and 145µm and CII at 157.7µm with the Long Wavelength Sp…
Ejecta Distributions of Heavy Elements in the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +2 more
We analyzed the metal distribution of the Cygnus Loop using 14 and 7 pointing observation data obtained by the Suzaku and XMM-Newton observatories, respectively. The spectral analysis shows that all of the spectra are well fitted by a two-kTe nonequilibrium ionization plasma model, as shown by earlier observations. From the best-fit par…