Search Publications
Missions
Journals
Publication Years
Distance and extinction determination for APOGEE stars with Bayesian method
Shi, Jianrong; Pan, Kaike; Chen, Bingqiu +3 more
Using a Bayesian technology, we derived distances and extinctions for over 100 000 red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey by taking into account spectroscopic constraints from the APOGEE stellar parameters and photometric constraints from Two Micron All-Sky Survey, as well as a prior …
Pulsating hot O subdwarfs in ω Centauri: mapping a unique instability strip on the extreme horizontal branch
Dhillon, V. S.; Chayer, P.; Fontaine, G. +10 more
We present the results of an extensive survey for rapid pulsators among Extreme Horizontal Branch (EHB) stars in ω Cen. The observations performed consist of nearly 100 h of time-series photometry for several off-centre fields of the cluster, as well as low-resolution spectroscopy for a partially overlapping sample. We obtained photometry for some…
Nine new open clusters within 500 pc from the Sun
Goldman, Bertrand; Röser, Siegfried; Schilbach, Elena
Aims: One of the results of the Milky Way Star Clusters (MWSC) survey was the detection of a slight under-density of old (ca. 1 Gyr) clusters within the nearest kilo-parsec from the Sun. This under-density may be due to an ineffectiveness in the detection of larger structures with lower surface brightness. We report on our attempts to reveal …
X-ray analysis of the galaxy group UGC 03957 beyond R200 with Suzaku
Thölken, Sophia; Reiprich, Thomas H.; Lovisari, Lorenzo +1 more
Context. In the last few years, the outskirts of galaxy clusters have been studied in detail and the analyses have brought up interesting results such as indications of possible gas clumping and the breakdown of hydrostatic, thermal, and ionization equilibrium. These phenomena affect the entropy profiles of clusters, which often show deviations fr…
Highly ionized region surrounding SN Refsdal revealed by MUSE
Treu, T.; Grillo, C.; Balestra, I. +9 more
Supernova (SN) Refsdal is the first multiply imaged, highly magnified, and spatially resolved SN ever observed. The SN exploded in a highly magnified spiral galaxy at z = 1.49 behind the Frontier Fields cluster MACS1149, and provides a unique opportunity to study the environment of SNe at high z. We exploit the time delay between multiple images t…
Physical properties and dynamical relation of the circular depressions on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +52 more
Aims: We aim to characterize the circular depressions of comet 67P/Churyumov-Gerasimenko and investigate whether such surface morphology of a comet nucleus is related to the cumulative sublimation effect since becoming a Jupiter family comet (JFC).
Methods: The images from the Rosetta/OSIRIS science camera experiment are used to construc…
Determination of Coronal Mass Ejection Physical Parameters from a Combination of Polarized Visible Light and UV Lyα Observations
Bemporad, A.; Susino, R.
Visible-light observations of Coronal Mass Ejections (CMEs) performed with coronagraphs and heliospheric imagers (in primis on board the Solar and Heliospheric Observatory and STEREO missions) have offered the best way to study the kinematics and geometrical structure of these fundamental events so far. Nevertheless, it has been widely demonstrate…
Rings and arcs around evolved stars - I. Fingerprints of the last gasps in the formation process of planetary nebulae
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +3 more
Evolved stars such as asymptotic giant branch stars (AGB), post-AGB stars, proto-planetary nebulae (proto-PNe), and planetary nebulae (PNe) show rings and arcs around them and their nebular shells. We have searched for these morphological features in optical Hubble Space Telescope and mid-infrared Spitzer Space Telescope images of ∼650 proto-PNe a…
Mid-IR spectra of pre-main sequence Herbig stars: An explanation for the non-detections of water lines
Woitke, P.; Kamp, I.; Güdel, M. +7 more
Context. The mid-IR detection rate of water lines in disks around Herbig stars disks is about 5%, while it is around 50% for disks around T Tauri stars. The reason for this is still unclear.
Aims: In this study, we want to find an explanation for the different detection rates between low mass and high mass pre-main-sequence stars in the mid-I…
The CHIANTI atomic database
Young, P. R.; Mason, H. E.; Del Zanna, G. +2 more
The freely available CHIANTI atomic database was first released in 1996 and has had a huge impact on the analysis and modeling of emissions from astrophysical plasmas. It contains data and software for modeling optically thin atom and positive ion emission from low density (≲1013 cm-3) plasmas from x-ray to infrared wavelengt…