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The recent star formation history of the Hipparcos solar neighbourhood
Gilmore, Gerard; Valls-Gabaud, David; Hernandez, X.
We use data from the Hipparcos catalogue to construct colour-magnitude diagrams for the solar neighbourhood, which are then treated using advanced Bayesian analysis techniques to derive the star formation rate history, SFR(t), of this region over the last 3Gyr. The method we use allows the recovery of the underlying SFR(t) without the need of assu…
Early life of coronal mass ejections
Thompson, B. J.; Gopalswamy, N.
Coronal mass ejections (CMEs) are large-scale magnetized plasma structures ejected from closed magnetic field regions of the Sun. White light coronagraphic observations from ground and space have provided extensive information on CMEs in the outer corona. However, our understanding of the solar origin and early life of CMEs is still in an elementa…
LMC and SMC Cepheids: combining bt OGLE with bt DENIS and bt 2MASS infrared data
Groenewegen, M. A. T.
I cross-correlate the ogle database of Cepheids in the Large and Small Magellanic Clouds (MCs) with the second incremental release of the 2mass JHKs survey, and the denis IJKs point source catalog towards the MCs. Of the 3384 Cepheids in ogle in both Clouds, 1745 have a counterpart in the 2mass survey within an 1'' radius and…
ISO Mid-Infrared Observations of Normal Star-Forming Galaxies: The Key Project Sample
Beichman, Charles A.; Dale, Daniel A.; Dinerstein, Harriet L. +17 more
We present mid-infrared maps and preliminary analysis for 61 galaxies observed with the ISOCAM instrument aboard the Infrared Space Observatory. Many of the general features of galaxies observed at optical wavelengths-spiral arms, disks, rings, and bright knots of emission-are also seen in the mid-infrared, except the prominent optical bulges are …
Observational Upper Limits to Low-Degree Solar g-Modes
Kosovichev, A. G.; Hoeksema, J. T.; Scherrer, P. H. +12 more
Observations made by the Michelson Doppler Imager (MDI) and Variability of solar IRradiance and Gravity Oscillations (VIRGO) on the Solar and Heliospheric Observatory (SOHO) and by the ground-based Birmingham Solar Oscillations Network (BiSON) and Global Oscillations Network Group (GONG) have been used in a concerted effort to search for solar gra…
Radio-rich solar eruptive events
Thompson, B. J.; Kaiser, M. L.; Burlaga, L. F. +6 more
We report on the analysis of a large number of solar eruptive events that produced radio emission in the dekameter-hectometric (DH) radio window (1-14 MHz), newly opened by the Wind/WAVES experiment. The distinguishing characteristics of coronal mass ejections (CMEs) associated with the DH type II radio bursts are larger-than-average width and spe…
The European Large Area ISO Survey - II. Mid-infrared extragalactic source counts
McMahon, Richard G.; Serjeant, Stephen; Clements, David L. +20 more
We present preliminary source counts at 6.7 and 15µm from the preliminary analysis of the European Large Area ISO Survey, with limiting flux densities of ~2mJy at 15µm and ~1mJy at 6.7µm. We separate the stellar contribution from the extragalactic using identifications with automated plate measurement sources made with the likeli…
Mining the Metal-rich Stars for Planets
Laughlin, Gregory
We examine the correlation between stellar metallicity and the presence of short-period planets. It appears that approximately 1% of dwarf stars in the solar neighborhood harbor short-period planets characterized by near-circular orbits and orbital periods P<20 days. However, among the most metal-rich stars (defined as having [Fe/H]>0.2 dex)…
The HST snapshot survey of the B2 sample of low luminosity radio-galaxies: a picture gallery
Capetti, A.; Morganti, R.; de Ruiter, H. R. +3 more
A Hubble Space Telescope snapshot survey of the B2 sample of low luminosity radio galaxies has, at present, produced V and I images of 41 objects. Together with 16 images of B2 sources taken from the HST archive, there are now high resolution optical data for ~ 57% of the sample. All host galaxies are luminous ellipticals, except one which is a sp…
Observed constraint on proton-proton relative velocities in the solar wind
Goldstein, Bruce E.; Neugebauer, Marcia; Gary, S. Peter +1 more
From June 1994 to December 1995 the Ulysses spacecraft was within 3 AU of the Sun and traveled from high southern to high northern heliospheric latitudes. For this period, SWOOPS instrument data obtained when the magnetic field was approximately aligned with the radial direction from the Sun have been analyzed. In the fast wind at high latitudes, …