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Physical properties of γ Doradus pulsating stars and their relationship with long-period δ Scuti variables
Li, Lin-Jia; Qian, Sheng-Bang; Zhu, Li-Ying +3 more
We present LAMOST data on 168 γ Doradus (γ Dor) pulsating stars including stellar atmospheric parameters of 137 variables and spectral types for all of the samples. The distributions of period (P), temperature (T), gravitational acceleration (log(g)) and metallicity [Fe/H] are shown. It is found that most γ Dor variables are main-sequence stars wi…
Consistent radial velocities of classical Cepheids from the cross-correlation technique
Kervella, P.; Anderson, R. I.; Trahin, B. +11 more
Context. Accurate radial velocities (vrad) of Cepheids are mandatory within the context of Cepheid distance measurements using the Baade-Wesselink technique. The most common vrad derivation method consists in cross-correlating the observed stellar spectra with a binary template and measuring a velocity on the resulting mean p…
Resolving accretion flows in nearby active galactic nuclei with the Event Horizon Telescope
Nagar, Neil M.; Ramakrishnan, Venkatessh; Xie, Fu-Guo +5 more
The Event Horizon Telescope (EHT), now with its first ever image of the photon ring around the supermassive black hole of M87, provides a unique opportunity to probe the physics of supermassive black holes through Very Long Baseline Interferometry (VLBI), such as the existence of the event horizon, the accretion processes as well as jet formation …
Groundwater Control and Process Variability on the Equatorial Layered Deposits of Kotido Crater, Mars
Hauber, E.; Rossi, A. P.; Pondrelli, M. +4 more
Understanding the origin of the Hesperian-aged sulfate-bearing Equatorial Layered Deposits (ELDs) is crucial to infer Mars' climatic conditions during their formation and to assess their habitability potential. We investigated well-exposed ELDs in Kotido crater (Arabia Terra) and produced a detailed geological map of the crater infill, distinguish…
A Search for Spatially Resolved Infrared Rovibrational Molecular Hydrogen Emission from the Disks of Young Stars
Beck, Tracy L.; Bary, Jeffrey S.
We present results from a survey searching for spatially resolved near-infrared line emission from molecular hydrogen gas in the circumstellar environments of nine young stars: AA Tau, AB Aur, DoAr 21, GG Tau, GM Aur, LkCa 15, LkHα 264, UY Aur, and V773 Tau. Prior high-resolution spectra of these stars showed the presence of rovibrational H2<…
Combined asteroseismology, spectroscopy, and astrometry of the CoRoT B2V target HD 170580
Poretti, E.; Rainer, M.; Aerts, C. +9 more
Context. Space asteroseismology reveals that stellar structure and evolution models of intermediate- and high-mass stars are in need of improvement in terms of angular momentum and chemical element transport.
Aims: We aim to probe the interior structure of a hot, massive star in the core-hydrogen-burning phase of its evolution.
Methods: …
Link between brightest cluster galaxy properties and large scale extensions of 38 DAFT/FADA and CLASH clusters in the redshift range 0.2 < z < 0.9
Adami, C.; Durret, F.; Márquez, I. +2 more
Context. In the context of large-scale structure formation, clusters of galaxies are located at the nodes of the cosmic web, and continue to accrete galaxies and groups along filaments. In some cases, they show a very large extension and a preferential direction. Brightest cluster galaxies (BCGs) are believed to grow through the accretion of many …
On the Relation between Interstellar Spectral Features and Reddening
Krełowski, J.; Bondar, A.; Galazutdinov, G. +1 more
It is well known that interstellar spectral features correlate with color excess E(B-V). This suggests that measuring intensities of these features allows one to estimate reddening of stars. The aim of this paper is to check how tight intensities of interstellar diffuse bands (DIBs) are related to the amount of extinction, measured using E(B-V). <…
GJ 357: a low-mass planetary system uncovered by precision radial velocities and dynamical simulations
Suárez, Juan C.; Tuomi, M.; Jenkins, J. S. +5 more
We report the detection of a new planetary system orbiting the nearby M2.5V star GJ 357, using precision radial velocities from three separate echelle spectrographs, High Accuracy Radial velocity Planet Searcher (HARPS), High Resolution Echelle Spectrograph (HiRES), and Ultraviolet and Visible Echelle Spectrograph (UVES). Three small planets have …
First results from a large-scale proper motion study of the Galactic centre
Nogueras-Lara, F.; Gallego-Calvente, A. T.; Dong, H. +4 more
Proper motion studies of stars in the centre of the Milky Way have typically been limited to the Arches and Quintuplet clusters, and to the central parsec. Here we present the first results of a large-scale proper motion study of stars within several tens of parsecs of Sagittarius A* based on our 0.2″ angular resolution GALACTICNUCLEUS survey (epo…