Search Publications
Investigating datasets with high IRIS burst prevalence
Kleint, L.; Nelson, C. J.
Context. Approximately 0.01% of all Si IV 1394 Å spectra sampled in 2013 and 2014 by the Interface Region Imaging Spectrograph (IRIS) have IRIS burst profiles. However, these events are not evenly distributed across datasets with 19.31% of these spectra being identified in only six (of more than 3500) rasters.
Aims: Here, we investigate five …
Spatially resolved mid-infrared observations of the circumstellar environment of the born-again object FG Sge
Ohnaka, K.; Jara Bravo, B. A.
Context. FG Sge has evolved from the hot central star of the young planetary nebula Hen 1-5 to a G-K supergiant in the last 100 yr. It is one of the three born-again objects that have been identified as of yet, and they are considered to have undergone a thermal pulse in the post-asymptotic giant branch evolution.
Aims: We present mid-infrare…
Gaia-supported re-discovery of a remarkable weak line quasar from a variability and proper motion survey
Scholz, Ralf-Dieter; Meusinger, Helmut
We demonstrate that VPMS J170850.95+433223.7 is a weak line quasar (WLQ) which is remarkable in several respects. It was already classified as a probable quasar two decades ago, but with considerable uncertainty. The non-significant proper motion and parallax from the Gaia Early Data Release 3 have solidified this assumption. Based on previously u…
A Kepler K2 view of subdwarf A-type stars
Mösenlechner, G.; Paunzen, E.; Pelisoli, I. +3 more
Context. The spectroscopic class of subdwarf A-type (sdA) stars has come into focus in recent years because of their possible link to extremely low-mass white dwarfs, a rare class of objects resulting from binary evolution. Although most sdA stars are consistent with metal-poor halo main-sequence stars, the formation and evolution of a fraction of…
Cyclic changes in the interacting binary RX Cassiopeiae
Jurkovic, M. I.; Mennickent, R. E.; Djurašević, G. +6 more
We analyzed 109 years of published photometry and times of minima of the eclipsing interacting binary RX Cas. The inclusion of 171 previously unnoticed minima confirms the tendency of an increase in the orbital period at a rate of 1.84 s per cycle. We also find evidence of variations in the length of the previously reported long photometric cycle …
An astrometric mass estimate for asteroid (223) Rosa
Kretlow, M.
Context. Outer main belt asteroid (223) Rosa is a possible flyby target of opportunity for the European Space Agency (ESA) JUpiter ICy moons Explorer (JUICE) mission when it passes the asteroid belt on the way to Jupiter. The very low albedo and the featureless red spectra indicate a P-type asteroid in the Tholen taxonomy, though the yet known bul…
Mass assembly and active galactic nucleus activity at z ≳ 1.5 in the dense environment of XDCP J0044.0-2033
Tozzi, P.; Merlin, E.; Bongiorno, A. +4 more
Context. XDCP J0044.0−2033 is the most massive galaxy cluster known at z > 1.5 and its core shows a high density of galaxies, which are experiencing mergers and hosting nuclear activity.
Aims: We present a multi-wavelength study of a region of 24 kpc × 24 kpc located ∼157 kpc from the center of the cluster, for which we have photometric an…
Yet another star in the Albireo system. The discovery of Albireo Ad
Bastian, U.; Schröder, K. -P.; Mittag, M. +1 more
Context. Albireo is a well-known bright visual double star. It is still unclear if the components A and B form a gravitationally bound system. The component Albireo A is itself a binary star. The orbital parameters of the Albireo Aa, Ac system have been determined only recently. Thus, Albireo is still of interest for current research.
Aims: W…
Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE
Meisenheimer, K.; Augereau, J. -C.; Wolf, S. +50 more
Context. Asymptotic giant branch (AGB) stars are one of the main sources of dust production in the Galaxy. However, it is not yet clear what this process looks like and where the dust happens to be condensing in the circumstellar environment.
Aims: By characterizing the location of the dust and the molecules in the close environment of an AGB…
GS 121-05-037: A new Galactic chimney candidate with signs of triggered star formation
Molina Lera, J. A.; Cichowolski, S.; Suad, L. A.
Aims: The goal of this study is to analyze the H I supershell GS 121-05-037 and its role in triggering star formation.
Methods: To characterize the supershell, we analyzed the H I 21-cm line and the far-infrared emission distributions. In addition, to study the star formation processes related to GS 121-05-037, we used the Gaia survey, t…