Search Publications
Nitrogen abundance in the X-ray halos of clusters and groups of galaxies
Gu, Liyi; Mao, Junjie; Kaastra, Jelle S. +6 more
Context. Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clusters and groups of galaxies can be measured via prominent emission line features in their X-ray spectra. Elemental abundances are footprints of time-integrated yields of various stellar populations that have left their specific abundance patterns pr…
Interstellar dust in the solar system: model versus in situ spacecraft data
Altobelli, Nicolas; Krüger, Harald; Grün, Eberhard +3 more
Context. In the early 1990s, contemporary interstellar dust penetrating deep into the heliosphere was identified with the in situ dust detector on board the Ulysses spacecraft. Later on, interstellar dust was also identified in the data sets measured with dust instruments on board Galileo, Cassini, and Helios. Ulysses monitored the interstellar du…
Period-luminosity diagram of long period variables in the Magellanic Clouds. New aspects revealed from Gaia Data Release 2
Mowlavi, N.; Lecoeur-Taïbi, I.; Lebzelter, T. +4 more
Context. The period-luminosity diagram (PLD) has proven to be a powerful tool for studying populations of pulsating red giants. Gaia Data Release 2 (DR2) provides a large data set including many long-period variables (LPVs) on which this tool can be applied.
Aims: We investigate the location of LPVs from the Large and Small Magellanic Clouds …
HD 101584: circumstellar characteristics and evolutionary status
Lindqvist, M.; Olofsson, H.; Bergman, P. +8 more
Context. There is growing evidence that red giant evolution is often affected by an interplay with a nearby companion, in some cases taking the form of a common-envelope evolution.
Aims: We have performed a study of the characteristics of the circumstellar environment of the binary object HD 101584, that provides information on a likely evolu…
Transit least-squares survey. II. Discovery and validation of 17 new sub- to super-Earth-sized planets in multi-planet systems from K2
Heller, René; Hippke, Michael; Rodenbeck, Kai
The extended Kepler mission (K2) has revealed more than 500 transiting planets in roughly 500 000 stellar light curves. All of these were found either with the box least-squares algorithm or by visual inspection. Here we use our new transit least-squares (TLS) algorithm to search for additional planets around all K2 stars that are currently known …
Systematic investigation of chemical abundances derived using IR spectra obtained with GIANO
Ryde, N.; Ludwig, H. -G.; Bonifacio, P. +11 more
Context. Detailed chemical abundances of Galactic stars are needed in order to improve our knowledge of the formation and evolution of our galaxy, the Milky Way.
Aims: We took advantage of the GIANO archive spectra to select a sample of Galactic disc stars in order to derive their chemical inventory and to compare the abundances we derived fr…
New type II Cepheids from VVV data towards the Galactic center
Minniti, D.; Zoccali, M.; Contreras Ramos, R. +5 more
Context. The Galactic center (GC) is the densest region of the Milky Way. Variability surveys towards the GC potentially provide the largest number of variable stars per square degree within the Galaxy. However, high stellar density is also a drawback due to blending. Moreover, the GC is affected by extreme reddening, therefore near infrared obser…
Another relic bulge globular cluster: ESO 456-SC38 (Djorgovski 2)
Momany, Y.; Held, E. V.; Saviane, I. +7 more
Context. The object ESO 456-SC38 (Djorgovski 2) is one of the globular clusters that is closest to the Galactic center. It is on the blue horizontal branch and has a moderate metallicity of [Fe/H] ∼ -1.0. It is thus similar to the very old inner bulge globular clusters NGC 6522, NGC 6558, and HP 1, and therefore appears to be part of the primeval …
Dust properties in the cold and hot gas phases of the ATLAS3D early-type galaxies as revealed by AKARI
Kaneda, H.; Murata, K.; Yamagishi, M. +6 more
Context. The properties of the dust in the cold and hot gas phases of early-type galaxies (ETGs) are key to understanding ETG evolution.
Aims: We aim to conduct a systematic study of the dust in a large sample of local ETGs, focusing on relations between the dust and the molecular, atomic, and X-ray gas of the galaxies, as well as their envir…
J-PLUS: A wide-field multi-band study of the M 15 globular cluster. Evidence of multiple stellar populations in the RGB
Cortesi, Arianna; Chies-Santos, Ana L.; Mendes de Oliveira, Claudia +21 more
Context. As a consequence of internal and external dynamical processes, Galactic globular clusters (GCs) have properties that vary radially. Wide-field observations covering the entire projected area of GCs out to their tidal radii (rtidal) can therefore give crucial information on these important relics of the Milky Way formation era. …