Search Publications
HIDES spectroscopy of bright detached eclipsing binaries from the Kepler field - II. Double- and triple-lined objects
Kambe, E.; Maehara, H.; Ratajczak, M. +6 more
We present the results of our spectroscopic observations of eight detached eclipsing binaries (DEBs), selected from the Kepler Eclipsing Binary Catalog. Radial velocities (RVs) were calculated from high-resolution spectra obtained with the HIgh-Dispersion Echelle Spectrograph (HIDES) spectrograph, attached to the 1.88-m telescope of the Okayama As…
Overview of useful spectral regions for Venus: An update to encourage observations complementary to the Akatsuki mission
Sánchez-Lavega, A.; Widemann, T.; Imamura, T. +5 more
New tables to observe the planet Venus are presented with detailed information about the main spectral regions from 100 nm to 1 mm. The information hereby is updated thanks to the Venus Express legacy and recent ground-based observations, and we hope it can constitute a helpful tool for professional and amateur observers willing to support and coo…
Proper Motions and Structural Parameters of the Galactic Globular Cluster M71
Dalessandro, E.; Massari, D.; Ferraro, F. R. +4 more
By exploiting two ACS/HST data sets separated by a temporal baseline of ∼7 years, we have determined the relative stellar proper motions (PMs; providing membership) and the absolute PM of the Galactic globular cluster M71. The absolute PM has been used to reconstruct the cluster orbit within a Galactic, three-component, axisymmetric potential. M71…
Lyα Absorbers and the Coma Cluster
Yoon, Joo Heon; Putman, M. E.
The spatial and kinematic distribution of warm gas in and around the Coma Cluster is presented through observations of Lyα absorbers using background QSOs. Updates to the Lyα absorber distribution found in Yoon et al. for the Virgo Cluster are also presented. At 0.2-2.0R vir of Coma we identify 14 Lyα absorbers ({N}{{H}{{I}}}…
Individual, Model-independent Masses of the Closest Known Brown Dwarf Binary to the Sun
Lu, Jessica R.; Kalas, Paul; De Rosa, Robert J. +18 more
At a distance of ∼2 pc, our nearest brown dwarf neighbor, Luhman 16 AB, has been extensively studied since its discovery 3 years ago, yet its most fundamental parameter—the masses of the individual dwarfs—has not been constrained with precision. In this work, we present the full astrometric orbit and barycentric motion of Luhman 16 AB and the firs…
Herschel observations of the Galactic H II region RCW 79
Liu, Hong-Li; Yuan, Jing-Hua; Wu, Yuefang +12 more
Context. Triggered star formation around H II regions could be an important process. The Galactic H II region RCW 79 is a prototypical object for triggered high-mass star formation.
Aims: We aim to obtain a census of the young stellar population observed at the edges of the H II region and to determine the properties of the young sources in o…
Optimized Trajectories to the Nearest Stars Using Lightweight High-velocity Photon Sails
Heller, René; Hippke, Michael; Kervella, Pierre
New means of interstellar travel are now being considered by various research teams, assuming lightweight spaceships to be accelerated via either laser or solar radiation to a significant fraction of the speed of light (c). We recently showed that gravitational assists can be combined with the stellar photon pressure to decelerate an incoming ligh…
An artificial neural network to discover hypervelocity stars: candidates in Gaia DR1/TGAS
Rossi, E. M.; Brown, A. G. A.; Kordopatis, G. +5 more
The paucity of hypervelocity stars (HVSs) known to date has severely hampered their potential to investigate the stellar population of the Galactic Centre and the Galactic potential. The first Gaia data release (DR1, 2016 September 14) gives an opportunity to increase the current sample. The challenge is the disparity between the expected number o…
A Helioseismic Perspective on the Depth of the Minimum Between Solar Cycles 23 and 24
Broomhall, A. -M.
The minimum in the solar-activity cycle observed between Cycles 23 and 24 is generally regarded as being unusually deep and long. This minimum is being followed by a cycle with one of the smallest amplitudes in recent history. We perform an in-depth analysis of this minimum with helioseismology. We use Global Oscillation Network Group (GONG) data …
Polyaromatic disordered carbon grains as carriers of the UV bump: Far-UV to mid-IR spectroscopy of laboratory analogs
Dartois, E.; Giuliani, A.; Pino, T. +3 more
Context. A multiwavelength study of laboratory carbons with varying degrees of hydrogenation and sp2 hybridization is required to characterize the structure of the carbonaceous carriers of interstellar and circumstellar extinction.
Aims: We study the spectral properties of carbonaceous dust analogs from the far-ultraviolet to the m…