Search Publications
Resolving the L/T transition binary SDSS J2052-1609 AB
Bouy, H.; Henning, Th.; Brandner, W. +3 more
Context. Binaries provide empirically derived key constraints for star formation theories, including the overall binary fraction, mass ratio distribution, and the separation distribution. They play crucial roles in calibrating the output of theoretical models, such as absolute magnitudes, colors, and effective temperature depending on mass, metall…
Detection of the Detached Dust Shell of U Antliae at Mid-infrared Wavelengths with AKARI/IRC
Onaka, Takashi; Yamamura, Issei; Izumiura, Hideyuki +2 more
We report mid-infrared (MIR) imaging observations of the carbon star U Ant made with the Infrared Camera (IRC) on board AKARI. Subtraction of the artifacts and extended point-spread function of the central star reveals the detached dust shell around the carbon star at MIR wavelengths (15 and 24 µm) for the first time. The observed radial bri…
Comparing Phoebe's 2005 opposition surge in four visible light filters
Holtzman, J. A.; Helfenstein, P.; Chanover, N. J. +2 more
We observed Phoebe for 13 nights over a period of 55 days before, during, and after the 2005 Saturn opposition with the New Mexico State University (NMSU) 1-m telescope at Apache Point Observatory (APO) in Sunspot, NM and characterized the width and magnitude of Phoebe's opposition surge in BVRI filters. Our observations cover a phase angle range …
XMM-Newton observations of the young open cluster around λ Orionis
Franciosini, E.; Sacco, G. G.
Aims: We studied the X-ray properties of the young (~1-8 Myr) open cluster around the hot (O8 III) star λ Ori and compared them with those of the similarly-aged σ Ori cluster to investigate possible effects of the different ambient environment.
Methods: We analysed an XMM-Newton observation of the cluster using EPIC imaging and low-resol…
Identification of blue high proper motion objects in the Tycho-2 and 2MASS catalogues using Virtual Observatory tools
Caballero, J. A.; Solano, E.; Jiménez-Esteban, F. M.
Aims: With available Virtual Observatory tools, we looked for new bright blue high proper motion objects in the entire sky: white dwarfs, hot subdwarfs, runaway OB stars, and early-type stars in nearby young moving groups.
Methods: We performed an all-sky cross-match between the optical Tycho-2 and near-infrared 2MASS catalogues with Ala…
Hard X-ray Source Distributions on EUV Bright Kernels in a Solar Flare
Cao, Wenda; Ning, Zongjun
We explore the hard X-ray source distributions of an C1.1 flare occurred on 14 December 2007. Both Hinode/EIS and RHESSI observations are used. One of EIS rasters perfectly covers the double hard X-ray footpoints, where the EUV emission appears strong from the cool line of He II (log T=4.7) to the hot line of Fe XVI (log T=6.4). We analyze RHESSI …
Impact of solar wind depression on the dayside magnetosphere under northward interplanetary magnetic field
Ben-Jaffel, L.; Baraka, S.
We present a follow up study of the sensitivity of the Earth's magnetosphere to solar wind activity using a particles-in-cell model (Baraka and Ben Jaffel, 2007), but here during northward Interplanetary Magnetic Field (IMF). The formation of the magnetospheric cavity and its elongation around the planet is obtained with the classical structure of…
Star Formation Properties in Barred Galaxies (SFB). I. Ultraviolet to Infrared Imaging and Spectroscopic Studies of NGC 7479
Wu, Hong; Cao, Chen; Meng, Xian-Min +1 more
Large-scale bars and minor mergers are important drivers for the secular evolution of galaxies. Based on ground-based optical images and spectra as well as ultraviolet data from the Galaxy Evolution Explorer and infrared data from the Spitzer Space Telescope, we present a multi-wavelength study of star formation properties in the barred galaxy NGC…
Insolation in Titan's troposphere
Lunine, Jonathan I.; Lora, Juan M.; Goodman, Paul J. +1 more
Seasonality in Titan's troposphere is driven by latitudinally varying insolation. We show that the latitudinal distributions of insolation in the troposphere and at the surface, based on Huygens DISR measurements, can be approximated analytically with nonzero extinction optical depths τ, and are not equivalent to that at the top of the atmosphere …
The bimodality of the 10k zCOSMOS-bright galaxies up to z ~ 1: a new statistical and portable classification based on optical galaxy properties
Kneib, J. -P.; Maccagni, D.; Cimatti, A. +56 more
Aims: Our goal is to develop a new and reliable statistical method to classify galaxies from large surveys. We probe the reliability of the method by comparing it with a three-dimensional classification cube, using the same set of spectral, photometric and morphological parameters.
Methods: We applied two different methods of classificat…