Search Publications
Reconstructing merger timelines using star cluster age distributions: the case of MCG+08-11-002
Kewley, Lisa J.; Davies, Rebecca L.; U, Vivian +3 more
We present near-infrared imaging and integral field spectroscopy of the centre of the dusty luminous infrared galaxy merger MCG+08-11-002, taken using the Near InfraRed Camera 2 (NIRC2) and the OH-Suppressing InfraRed Imaging Spectrograph (OSIRIS) on Keck II. We achieve a spatial resolution of ∼25 pc in the K band, allowing us to resolve 41 star c…
94 Ceti: a triple star with a planet and dust disc
Faramaz, V.; Wiegert, J.; Cruz-Saenz de Miera, F.
94 Ceti is a triple star system with a circumprimary gas giant planet and far-infrared excess. Such excesses around main sequence stars are likely due to debris discs, and are considered as signposts of planetary systems and, therefore, provide important insights into the configuration and evolution of the planetary system. Consequently, to learn …
LOTUS: a low-cost, ultraviolet spectrograph
Marchant, J. M.; Steele, I. A.; Snodgrass, C. +10 more
We describe the design, construction and commissioning of a simple, low-cost long-slit spectrograph for the Liverpool Telescope. The design is optimized for near-UV and visible wavelengths and uses all transmitting optics. It exploits the instrument focal plane field curvature to partially correct axial chromatic aberration. A stepped slit provide…
First performance of the GeMS + GMOS system - 1. Imaging
Hibon, Pascale; Rigaut, Francois; Carrasco, Eleazar R. +6 more
During the commissioning of the Gemini MCAO System (GeMS), we had the opportunity to obtain data with the Gemini Multi-Object Spectrograph (GMOS), the most utilized instrument at Gemini South Observatory, in 2012 March and May. Several globular clusters were observed in imaging mode that allowed us to study the performance of this new and untested…
Bright stars observed by FIMS/SPEAR
Edelstein, Jerry; Jo, Young-Soo; Choi, Yeon-Ju +5 more
In this paper, we present a catalogue of the spectra of bright stars observed during the sky survey using the Far-Ultraviolet Imaging Spectrograph (FIMS), which was designed primarily to observe diffuse emissions. By carefully eliminating the contamination from the diffuse background, we obtain the spectra of 70 bright stars observed for the first…
A spiral galaxy's mass distribution uncovered through lensing and dynamics
van de Ven, Glenn; Dutton, Aaron A.; Trick, Wilma H.
We investigate the matter distribution of a spiral galaxy with a counter-rotating stellar core, SDSS J1331+3628 (J1331), independently with gravitational lensing and stellar dynamical modelling. By fitting a gravitational potential model to a quadruplet of lensing images around J1331's bulge, we tightly constrain the mass inside the Einstein radiu…
The variable V381 Lac and its possible connection with the R CrB phenomenon
Dell'Agli, F.; Nesci, R.; Rossi, C. +2 more
We have performed new medium resolution spectroscopy, optical and near-infrared photometry to monitor the variability of the asymptotic giant branch (AGB) carbon star V 381 Lac. Our observations revealed rapid and deep changes in the spectrum and extreme variability in the optical and near-infrared bands. Most notably we observed the change of Na …
Study of a bright-rimmed cloud at the border of the infrared dust bubble CN20
Rubio, M.; Ortega, M. E.; Giacani, E. +1 more
We characterize an uncatalogued bright-rimmed cloud located at the border of the infrared dust bubble CN20 with the aim of investigating triggered star formation. In order to do this, we carried out radio continuum observations at 8.9 GHz using the Jansky Very Large Array (JVLA) interferometer with a synthesized beam size of 13 arcsec × 5 arcsec, …
Analysis of horizontal flows in the solar granulation
Suematsu, Y.; Shimizu, T.; Quintero Noda, C.
Solar limb observations sometimes reveal the presence of a satellite lobe in the blue wing of the Stokes I profile from pixels belonging to granules. The presence of this satellite lobe has been associated in the past to strong line-of-sight gradients and, as the line-of-sight component is almost parallel to the solar surface, to horizontal granul…
Spectral mapping of V348 Puppis: spiral arms in the period gap
Saito, R. K.; Baptista, R.
We report the analysis of Hubble Space Telescope (HST) UV-optical spectroscopy of the nova-like variable V348 Puppis with eclipse mapping techniques. We measured the eclipse width at disc centre and determined a lower limit on the mass ratio of q > 0.3, with a tight relation between q and the binary inclination i. For 0.31 ≤ q ≤ 0.6, we have 79…