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Stellar laboratories . VIII. New Zr iv-vii, Xe iv-v, and Xe vii oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191-B2B and RE 0503-289
Hoyer, D.; Rauch, T.; Werner, K. +5 more
Context. For the spectral analysis of high-resolution and high-signal-to-noise spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation.
Aims: To search for zirconium and xenon lines i…
The abundance of compact quiescent galaxies since z ∼ 0.6
Erben, Thomas; Hildebrandt, Hendrik; Huertas-Company, Marc +12 more
We set out to quantify the number density of quiescent massive compact galaxies at intermediate redshifts. We determine structural parameters based on I-band imaging using the Canada-France-Hawaii Telescope (CFHT) equatorial Sloan Digital Sky Survey (SDSS) Stripe 82 (CS82) survey (∼170 deg2) taking advantage of an exquisite median seein…
A search for tight hierarchical triple systems amongst the eclipsing binaries in the CoRoT fields
Klagyivik, P.; Borkovits, T.; Benkő, J. M. +5 more
We report a comprehensive search for hierarchical triple stellar system candidates amongst eclipsing binaries (EBs) observed by the CoRoT spacecraft. We calculate and check eclipse timing variation (ETV) diagrams for almost 1500 EBs in an automated manner. We identify five relatively short period Algol systems for which our combined light-curve an…
The Class 0 Protostar BHR71: Herschel Observations and Dust Continuum Models
Dunham, Michael M.; Green, Joel D.; Yang, Yao-Lun +2 more
We use Herschel spectrophotometry of BHR71, an embedded Class 0 protostar, to provide new constraints on its physical properties. We detect 645 (non-unique) spectral lines among all spatial pixels. At least 61 different spectral lines originate from the central region. A CO rotational diagram analysis shows four excitation temperature components, …
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…