Search Publications
High-resolution Near-infrared Polarimetry and Submillimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System
Henning, Thomas; Nakagawa, Takao; Terada, Hiroshi +56 more
We analyzed the young (2.8 Myr-old) binary system FS Tau A using near-infrared (H-band) high-contrast polarimetry data from Subaru/HiCIAO and submillimeter CO (J = 2-1) line emission data from Atacama Large Millimeter/submillimeter Array (ALMA). Both the near-infrared and submillimeter observations reveal several clear structures extending to ∼240…
Outflow from Outer-arm Starburst in a Grazing Collision between Galaxies
Brinks, Elias; Struck, Curtis; Elmegreen, Bruce G. +5 more
Gemini NIFS K-band spectra and Atacama Large Millimeter/submillimeter Array 12CO $J=1\to 0, HCO+, and 100 GHz continuum observations are used to study a bright starburst clump on an outer arm of the interacting galaxy NGC 2207. This clump emits 23% of the total 24 µm flux of the galaxy pair and has an optically opaque d…
High-resolution spectroscopy of detached solar-type eclipsing binaries observed during the Kepler K2 mission
Çakırlı, Ö.; Hoyman, B.
Solar-type stars in eclipsing binaries are proving to be a remarkable resource of knowledge for testing models of stellar evolution, as spectroscopic and photometric studies have opened up a window into their interiors. Until recently, many cases have been worked out with Kepler data. In an ongoing effort to elucidate this research, we examine fiv…
Correlating the non-linear time series and spectral properties of IGR J17091-3624: is it similar to GRS 1915+105?
Misra, Ranjeev; Adegoke, Oluwashina; Mukhopadhyay, Banibrata
Using the correlation integral method, we explore the non-linear properties of IGR J17091-3624 by comparing the underlying behaviour to GRS 1915+105. We find that while GRS 1915+105 is known to reveal a combination of fractal (or even chaotic) and stochastic behaviours depending on its temporal class, IGR J17091-3624 mostly shows stochastic behavi…
Identification of Possible Stellar Companions via Speckle Interferometry in a Sample of Be Stars
Borges Fernandes, M.; Guerrero, C. A.; Souza, T. B.
We present speckle interferometric measurements of Be stars made with the 1.60 m Perkin-Elmer telescope at the Pico dos Dias Observatory of the Laboratório Nacional de Astrofísica in Brazil. Using three different filters (V, R, and I), we obtained astrometric measurements for 23 stars, during three observing runs allocated in 2017 March, 2018 Apri…
A Search for Extra-tidal RR Lyrae in Globular Clusters NGC 5024 and NGC 5053
Riddle, Reed; Rusholme, Ben; Kaplan, David L. +9 more
Recently, Kundu et al. reported that the globular cluster NGC 5024 (M53) possesses five extra-tidal RR Lyrae. In fact, four of them were instead known members of a nearby globular cluster NGC 5053. The status of the remaining extra-tidal RR Lyrae is controversial depending on the adopted tidal radius of NGC 5024. We have also searched for addition…
The Gran Telescopio Canarias OSIRIS broad-band first data release
Cortés-Contreras, M.; Bouy, H.; Solano, E. +4 more
We present the first release of GTC OSIRIS broad-band data archive. This is an effort conducted in the framework of the Spanish Virtual Observatory to help optimize science from the Gran Telescopio Canarias Archive. Data Release 1 includes 6788 broad-band images in the Sloan griz filters obtained between 2009 April and 2014 January and the associa…
Postimpact Evolution of the Southern Hale Crater Ejecta, Mars
Balme, M. R.; Brough, S.; Ross, N. +4 more
As one of the youngest large (>100 km wide) impacts on Mars, Hale crater offers a unique opportunity to observe well-preserved deposits of Mars' former interior. We utilize visible imagery (Context Camera [CTX] and High Resolution Imaging Science Experiment [HiRISE]) and elevation data (Mars Orbiter Laser Altimeter [MOLA], High Resolution Stere…
The First Orbits of Six Wide Double Stars in the Solar Neighborhood Based on Gaia DR2 Observations
Romanenko, L. G.; Kiyaeva, O. V.
The apparent motion parameter (AMP) method is designed to determine the orbits of wide pairs of double stars with orbital periods of hundreds and thousands of years. This is a dynamical method using all that is known about the star at one moment to reconstruct its complete orbit within the two-body problem. The Gaia DR2 catalog contains all of the…
Solar System Encounters with Open Star Clusters
Vereshchagin, S. V.; Chupina, N. V.; Sizova, M. D. +1 more
The time and minimum distances of approaches were calculated more than 100 open star clusters (OSCs) near the Solar System over the past 5 Myr. It was shown that the closest proximity of the centers of the OSCs to the Solar System usually exceeded 60 pc. The Hyades cluster approached the Solar System at ~25 pc. The effect of such encounters on the…