Search Publications
Missions
Journals
Publication Years
The red clump absolute magnitude based on revised Hipparcos parallaxes
Groenewegen, M. A. T.
Context: Over the past decade the use of the red clump (RC) as distance indicator has increased in importance as this evolutionary phase is well populated and a good local calibration exists.
Aims: The absolute calibration of the RC in the I and K band is investigated again based on the recently published revised Hipparcos parallaxes.
Meth…
Open Clusters as Galactic Disk Tracers. I. Project Motivation, Cluster Membership, and Bulk Three-Dimensional Kinematics
Majewski, Steven R.; Frinchaboy, Peter M.
We have begun a survey of the chemical and dynamical properties of the Milky Way disk as traced by open star clusters. In this first contribution, the general goals of our survey are outlined and the strengths and limitations of using star clusters as a Galactic disk tracer sample are discussed. We also present medium-resolution (R ~ 15, 0000) spe…
Statistical analysis of plasmaspheric plumes with Cluster/WHISPER observations
de Keyser, J.; Décréau, P. M. E.; Vallières, X. +2 more
Plasmaspheric plumes have been routinely observed by the four Cluster spacecraft. This paper presents a statistical analysis of plumes observed during five years (from 1 February 2001 to 1 February 2006) based on four-point measurements of the plasmasphere (outside 4 Earth radii) as it is sampled by the spacecraft in a narrow local time sector bef…
Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA
Carpenter, John M.; Wilner, D.; Eisner, J. A. +3 more
We imaged a 2' × 2' region of the Orion Nebula Cluster (ONC) in 1.3 mm wavelength continuum emission with the recently commissioned Combined Array for Research in Millimeter Astronomy (CARMA) and with the Submillimeter Array (SMA). Our mosaics include >250 known near-IR cluster members, of which 36 are so-called ``proplyds…
The development of new solar indices for use in thermospheric density modeling
Tobiska, W. Kent; Bouwer, S. Dave; Bowman, Bruce R.
New solar indices have been developed to improve thermospheric density modeling for research and operational purposes. Out of 11 new and 4 legacy indices and proxies, we have selected 3 (F10.7, S10.7, and M10.7) for use in the new JB2006 empirical thermospheric density model. In this work, we report on the development of these solar irradiance ind…
Derivation of density and temperature from the Cassini Huygens CAPS electron spectrometer
André, N.; Lewis, G. R.; Coates, A. J. +4 more
In this paper we present two methods to derive electron fluid parameters from the CAPS-ELS spectrometer on board the Cassini spacecraft currently in orbit around Saturn. In the first part of the paper we give a basic overview of the instrument and describe the challenges inherent in the derivation of density and temperature values using these tech…
The Persistence of Memory, or How the X-Ray Spectrum of SNR 0509-67.5 Reveals the Brightness of Its Parent Type Ia Supernova
Hughes, John P.; Badenes, Carles; Bravo, Eduardo +1 more
We examine the dynamics and X-ray spectrum of the young Type Ia supernova remnant 0509-67.5 in the context of the recent results obtained from the optical spectroscopy of its light echo. Our goal is to estimate the kinetic energy of the supernova explosion using Chandra and XMM-Newton observations of the supernova remnant, thus placing the birth e…
Early Formation of Dust in the Ejecta of Type Ib SN 2006jc and Temperature and Mass of the Dust
Onaka, Takashi; Sakon, Itsuki; Tominaga, Nozomu +8 more
SN 2006jc is a peculiar supernova (SN), in which the formation of dust has been confirmed at an early epoch of ~50 days after the explosion. We investigate the possibility of such an early formation of dust grains in the expanding ejecta of SN 2006jc, applying the Type Ib SN model that is developed to reproduce the observed light curve. We find th…
Auroral evidence of a localized magnetic anomaly in Jupiter's northern hemisphere
Gustin, Jacques; Clarke, John T.; Connerney, John E. P. +5 more
We analyze more than 1000 HST/Advanced Camera for Survey images of the ultraviolet auroral emissions appearing in the northern hemisphere of Jupiter. The auroral footprints of Io, Europa, and Ganymede form individual footpaths, which are fitted with three reference contours. The satellite footprints provide a convenient mapping between the norther…
The multiple quasar Q2237+0305 under a microlensing caustic
Schmidt, R. W.; Anguita, T.; Wambsganss, J. +5 more
We use the high magnification event seen in the 1999 OGLE campaign light curve of image C of the quadruply imaged gravitational lens Q2237+0305 to study the structure of the quasar engine. We have obtained g'- and r'-band photometry at the Apache Point Observatory 3.5 m telescope where we find that the event has a smaller amplitude in the r'-band …