Search Publications
Studies of the distinct regions due to CO selective dissociation in the Aquila molecular cloud
Li, Dalei; Zhou, Jianjun; Wu, Gang +6 more
Aims: We investigate the role of selective dissociation in the process of star formation by comparing the physical parameters of protostellar-prestellar cores and the selected regions with the CO isotope distributions in photo-dissociation regions. We seek to understand whether there is a better connection between the evolutionary age of star…
Dense cores in the Seahorse infrared dark cloud: physical properties from modified blackbody fits to the far-infrared-submillimetre spectral energy distributions
Miettinen, O.
Context. Infrared dark clouds (IRDCs) can be the birth sites of high-mass stars, and hence determining the physical properties of dense cores in IRDCs is useful to constrain the initial conditions and theoretical models of high-mass star formation.
Aims: We aim to determine the physical properties of dense cores in the filamentary Seahorse IR…
The K supergiant runaway star HD 137071
Comerón, F.; Figueras, F.
Context. Extensive work exists on runaway massive stars with peculiar motions that are much higher than those typical of the extreme Population I to which they belong. Work on runaways has focused almost exclusively on O and B stars, most of which undergo a red supergiant phase before ending their lives as supernovae. Very few examples are known o…
Signatures of the Galactic bar in high-order moments of proper motions measured by Gaia
Allende Prieto, Carlos; Palicio, Pedro A.; Martinez-Valpuesta, Inma +1 more
Our location in the Milky Way provides an exceptional opportunity to gain insight on the galactic evolution processes, and complement the information inferred from observations of external galaxies. Since the Milky Way is a barred galaxy, the study of motions of individual stars in the bulge and disc is useful to understand the role of the bar. Th…
Fast quasi-periodic oscillations in the eclipsing polar VV Puppis from VLT and XMM-Newton observations
Dhillon, V. S.; Bonnet-Bidaud, J. M.; Marsh, T. R. +7 more
We present high time resolution optical photometric data of the polar VV Puppis obtained simultaneously in three filters (u', HeII λ4686, r') with the ULTRACAM camera mounted at the ESO-VLT telescope. An analysis of a long 50 ks XMM-Newton observation of the source, retrieved from the database, is also provided. Quasi-periodic oscillations (QPOs) …
Multiple populations of Hβ emission line stars in the Large Magellanic Cloud cluster NGC 1971
Piatti, Andrés E.
We revisited the young Large Magellanic Cloud star cluster NGC 1971 with the aim of providing additional clues to our understanding of its observed extended main-sequence turnoff (eMSTO), a feature commonly seen in young star clusters that has recently been argued to be caused by a real age spread similar to the cluster age (∼160 Myr). We combined…
Quantitative assessment of water content and mineral abundances at Gale crater on Mars with orbital observations
Liu, Yang; Zou, Yongliao; Stachurski, Federico +1 more
Context. The information of water content can help to improve atmospheric and climate models, and thus provide a better understanding of the past and present role of water and aqueous alteration on Mars. Mineral abundances can provide unique constraints on their formation environments and thus also on the geological and climate evolution of Mars. …
Diagnostics of plasma ionisation using torsional Alfvén waves
Ballai, I.
Aims: Using the recently observed torsional Alfvén waves in solar prominences, we determine the ionisation state of the plasma by taking into account that Alfvén waves propagate in a partially ionised prominence plasma. We derive the evolutionary equation of waves and compare the analytical solutions to observations to determine the number de…
Extended view on the dust shells around two carbon stars
Groenewegen, M. A. T.; Kerschbaum, F.; Aringer, B. +4 more
Context. Stars on the asymptotic giant branch lose considerable amounts of matter through their dust-driven stellar winds. A number of such sources have been imaged by Herschel/PACS, revealing a diverse sample of different morphological types. Among them are a few examples which show geometrically thin, spherically symmetric shells which can be us…
Infrared interferometric imaging of the compact dust disk around the AGB star HR3126 with the bipolar Toby Jug Nebula
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +1 more
Aims: The asymptotic giant branch (AGB) star HR3126, associated with the arcminute-scale bipolar Toby Jug Nebula, provides a rare opportunity to study the emergence of bipolar structures at the end of the AGB phase. Our goal is to image the central region of HR3126 with high spatial resolution.
Methods: We carried out long-baseline inter…