Search Publications
The β Pictoris association low-mass members: Membership assessment, rotation period distribution, and dependence on multiplicity
Lanzafame, A. C.; Messina, S.; Zhang, L. +6 more
Context. Low-mass members of young loose stellar associations and open clusters exhibit a wide spread of rotation periods. Such a spread originates from the distributions of masses and initial rotation periods. However, multiplicity can also play a significant role.
Aims: We aim to investigate the role played by physical companions in multipl…
Observations of Ellerman bomb emission features in He I D3 and He I 10 830 Å
Joshi, Jayant; Leenaarts, Jorrit; Libbrecht, Tine +2 more
Context. Ellerman bombs (EBs) are short-lived emission features, characterised by extended wing emission in hydrogen Balmer lines. Until now, no distinct signature of EBs has been found in the He I 10 830 Å line, and conclusive observations of EBs in He I D3 have never been reported.
Aims: We aim to study the signature of EBs in ne…
Star formation towards the Galactic H II region RCW 120. Herschel observations of compact sources
Abergel, A.; Bernard, J. -P.; Hill, T. +16 more
Context. The expansion of H II regions can trigger the formation of stars. An overdensity of young stellar objects is observed at the edges of H II regions but the mechanisms that give rise to this phenomenon are not clearly identified. Moreover, it is difficult to establish a causal link between H II -region expansion and the star formation obser…
Strong H I Lyman-α variations from an 11 Gyr-old host star: a planetary origin?
Thomas, N.; Ehrenreich, D.; Lovis, C. +8 more
Kepler-444 provides a unique opportunity to probe the atmospheric composition and evolution of a compact system of exoplanets smaller than the Earth. Five planets transit this bright K star at close orbital distances, but they are too small for their putative lower atmosphere to be probed at optical/infrared wavelengths. We used the Space Telescop…
Luminosities and infrared excess in Type II and anomalous Cepheids in the Large and Small Magellanic Clouds
Groenewegen, M. A. T.; Jurkovic, M. I.
Type II and anomalous Cepheids (ACs) are useful distance indicators when there are too few classical Cepheids or when RR Lyrae stars are too faint. Type II and ACs follow a period-luminosity relation as well, but they are less well-studied classes of objects. In this paper we study the sample of 335 Type II and ACs in the Small and Large Magellani…
A swirling jet in the quasar 1308+326
Britzen, S.; Krause, M.; Moser, L. +12 more
Context. Despite numerous and detailed studies of the jets of active galactic nuclei (AGN) on pc-scales, many questions are still debated. The physical nature of the jet components is one of the most prominent unsolved problems, as is the launching mechanism of jets in AGN. The quasar 1308+326 (z = 0.997) allows us to study the overall properties …
Sulphur-bearing molecules in AGB stars. I. The occurrence of hydrogen sulphide
Olofsson, H.; Decin, L.; De Beck, E. +4 more
Context. Sulphur is a relatively abundant element in the local Galaxy that is known to form a variety of molecules in the circumstellar envelopes of AGB stars. The abundances of these molecules vary based on the chemical types and mass-loss rates of AGB stars.
Aims: Through a survey of (sub-)millimetre emission lines of various sulphur-bearin…
Approaching hell's kitchen: Molecular daredevil clouds in the vicinity of Sagittarius A*
Eckart, Andreas; Moser, Lydia; García-Marin, Macarena +9 more
We report serendipitous detections of line emission with the Atacama Large Millimeter/submillimeter Array (ALMA) in bands 3, 6, and 7 in the central parsec down to within 1'' around Sgr A* at an up to now highest resolution (<0.5'') view of the Galactic center (GC) in the submillimeter (sub-mm) domain. From the 100 GHz continuum and the H39α em…
Kinematic structures of the solar neighbourhood revealed by Gaia DR1/TGAS and RAVE
Bensby, T.; Schirmer, T.; Kushniruk, I.
Context. The velocity distribution of stars in the solar neighbourhood is inhomogeneous and rich with stellar streams and kinematic structures. These may retain important clues regarding the formation and dynamical history of the Milky Way. However, the nature and origin of many of the streams and structures is unclear, hindering our understanding…
The MUSE Hubble Ultra Deep Field Survey. III. Testing photometric redshifts to 30th magnitude
Inami, H.; Kollatschny, W.; Richard, J. +14 more
We tested the performance of photometric redshifts for galaxies in the Hubble Ultra Deep field down to 30th magnitude. We compared photometric redshift estimates from three spectral fitting codes from the literature (EAZY, BPZ and BEAGLE) to high quality redshifts for 1227 galaxies from the MUSE integral field spectrograph. All these codes can ret…