Search Publications

A new look at the long-period eclipsing binary V383 Scorpii

Gromadzki, M.; Strobel, A.; Gałan, C. +9 more

Context. The system V383 Sco was discovered to be an eclipsing binary star at the beginning of the twentieth century. This system has one of the longest orbital periods known (13.5 yr) and was initially classified as a ζAur-type eclipsing variable. It was then forgotten about for decades, with no progress made in understanding it.
Aims: This …

Extended-object reconstruction in adaptive-optics imaging: the multiresolution approach

Baena Gallé, R.; Núñez, J.; Gladysz, S.

Aims: We propose the application of multiresolution transforms, such as wavelets and curvelets, to reconstruct images of extended objects that have been acquired with adaptive-optics (AO) systems. Such multichannel approaches normally make use of probabilistic tools to distinguish significant structures from noise and reconstruction residuals…

Toward generalized planetary stereo analysis scheme—Prototype implementation with multi-resolution Martian stereo imagery

Kim, Jung-Rack; Lin, Shih-Yuan; Kim, Young-Hwi +1 more

Stereo analysis of orbital imagery is highly valuable for scientific research in planetary surface. Thus, the processing of planetary stereo imagery has been progressed with various approaches and resulted in a series of uncontrolled topographic products. In order to fully utilize the data derived from image systems carried on various planetary or…

An algorithm for geometric correction of full pass TMC imagery of Chandrayaan-1

Radhadevi, P. V.; Solanki, S. S.; Nagasubramanian, V. +4 more

This paper describes the development of an algorithm for geometric correction of Terrain Mapping Camera (TMC) imagery of Chandrayaan-1 (CH-1). The correction is based on a rigorous sensor model. The algorithm incorporates the camera geometry model, satellite data and lunar control points in a rigorous bundle adjustment updating the satellite model…

Active regions near the recent solar-cycle minimum: Relation between plasma heating and electrical currents

Livshits, M. A.; Rudenko, G. V.; Grigor'eva, I. Yu. +1 more

Data on small active regions on the Sun collected over three years (2007-2009) are analyzed. Under very quiescent conditions (a low X-ray background level), the shapes of the coronal loops of some active regions correspond fairly well to the shapes of magnetic-field lines calculated in a potential approximation. This is true of several active regi…

Erratum: "An X-Rays Survey of the Young Stellar Population of the Lynds 1641 and Iota Orionis Regions" (2013, ApJ, 768, 99)

Walter, F.; Micela, G.; Megeath, S. T. +12 more

Moving Objects in the Hubble Ultra Deep Field

Kilic, Mukremin; von Hippel, Ted; Gianninas, Alexandros

We identify proper motion objects in the Hubble Ultra Deep Field (UDF) using the optical data from the original UDF program in 2004 and the near-infrared data from the 128 orbit UDF 2012 campaign. There are 12 sources brighter than I = 27 mag that display >3σ significant proper motions. We do not find any proper motion objects fainter than this…

Results of the Recent \varepsilon Aurigae Eclipse Campaign

Stencel, R. E.

Results of the 2010 eclipse campaign are described, and preliminary interpretations proposed. These include photometric, interferometric, spectroscopic, astrometric and polarimetric observational results. Next steps, along with continued monitoring, include simulations and other future work. Numerous acknowledgements are appropriate for the many p…

High-resolution spectra of the planetary nebula NGC 6803

Hyung, S.; Lee, S. -J.

We present the high-dispersion spectra of the elliptical ring shaped planetary nebula NGC 6803, secured with the Hamilton Echelle Spectrograph attached to the 3-m Shane telescope of Lick Observatory. Numerous lines from neutral to quadruply ionized ions are presented in the wavelength region from 3650 to 9900 Å. We also use the low dispersion UV s…

Solar wind-driven plasma fluxes from the Venus ionosphere

Barabash, S.; Lundin, R.; Zhang, T. L. +4 more

conducted with the ASPERA-4 instrument and the magnetometer of the Venus Express spacecraft show that the kinetic pressure of planetary O⁺ ion fluxes measured in the Venus wake can be significantly larger than the local magnetic pressure, and as a result, those ions are not solely being driven by magnetic forces but also by the kinetic …