Search Publications
The spiral potential of the Milky Way
Carraro, G.; Grosbøl, P.
Context. The location of young sources in the Galaxy suggests a four-armed spiral structure, whereas tangential points of spiral arms observed in the integrated light at infrared and radio wavelengths indicate that only two arms are massive.
Aims: Variable extinction in the Galactic plane and high light-to-mass ratios of young sources make it…
Detailed chemical abundance analysis of the thick disk star cluster Gaia 1
Kunder, Andrea; Hansen, Terese T.; Koch, Andreas
Star clusters, particularly those objects in the disk-bulge-halo interface are as yet poorly charted, despite the fact that they carry important information about the formation and the structure of the Milky Way. Here, we present a detailed chemical abundance study of the recently discovered object Gaia 1. Photometry has previously suggested it as…
An atlas of cool supergiants from the Magellanic Clouds and typical interlopers. A guide for the classification of luminous red stars
Negueruela, Ignacio; González-Fernández, Carlos; Dorda, Ricardo +1 more
We present an atlas composed of more than 1500 spectra of late-type stars (spectral types from G to M) observed simultaneously in the optical and calcium triplet spectral ranges. These spectra were obtained as part of a survey to search for cool supergiants in the Magellanic Clouds and were taken over four epochs. We provide the spectral and lumin…
The root of a comet tail: Rosetta ion observations at comet 67P/Churyumov-Gerasimenko
Behar, E.; Nilsson, H.; Goetz, C. +7 more
Context. The first 1000 km of the ion tail of comet 67P/Churyumov-Gerasimenko were explored by the European Rosetta spacecraft, 2.7 au away from the Sun.
Aims: We characterised the dynamics of both the solar wind and the cometary ions on the night-side of the comet's atmosphere.
Methods: We analysed in situ ion and magnetic field measure…
Searching for supernovae in the multiply-imaged galaxies behind the gravitational telescope A370
Lidman, C.; Amanullah, R.; Fabbro, S. +7 more
Aims: Strong lensing by massive galaxy clusters can provide magnification of the flux and even multiple images of the galaxies that lie behind them. This phenomenon facilitates observations of high-redshift supernovae (SNe) that would otherwise remain undetected. Type Ia supernovae (SNe Ia) detections are of particular interest because of the…
Low-mass star formation and subclustering in the H II regions RCW 32, 33, and 27 of the Vela Molecular Ridge. A photometric diagnostics for identifying M-type stars
Micela, G.; Sciortino, S.; Guarcello, M. G. +4 more
Context. Most stars are born in clusters, and recent results suggest that star formation (SF) preferentially occurs in subclusters. Studying the morphology and SF history of young clusters is crucial for understanding early cluster formation processes.
Aims: We aim to identify the embedded population of young stellar objects (YSOs) down to th…
Modeling dust emission in PN IC 418
Morisset, C.; García-Lario, P.; Szczerba, R. +2 more
We investigated the infrared (IR) dust emission from PN IC 418, using a detailed model controlled by a previous determination of the stellar properties and the characteristics of the photoionized nebula, keeping as free parameters the dust types, amounts, and distributions relative to the distance of the central star. The model includes the ionize…
Passband reconstruction from photometry
Jordi, C.; Fabricius, C.; Carrasco, J. M. +1 more
Context. Based on an initial expectation from laboratory measurements or instrument simulations, photometric passbands are usually subject to refinements. These refinements use photometric observations of astronomical sources with known spectral energy distribution.
Aims: This work investigates the methods for and limitations in determining p…
Revised SED of the triple protostellar system VLA 1623-2417
Hogerheijde, M. R.; Harsono, D.; Murillo, N. M. +2 more
Context. VLA 1623-2417 is a triple protostellar system deeply embedded in Ophiuchus A. Sources A and B have a separation of 1.1″, making their study difficult beyond the submillimeter regime. Lack of circumstellar gas emission suggested that VLA 1623-2417 B has a very cold envelope and is much younger than source A, which is generally considered t…
Discovery of X-ray pulsations in the Be/X-ray binary IGR J06074+2205
Zezas, A.; Reig, P.
Context. IGR J06074+2205 is a poorly studied X-ray source with a Be star companion. It has been proposed to belong to the group of Be/X-ray binaries (BeXBs). In BeXBs, accretion onto the neutron star occurs via the transfer of material from the Be star's circumstellar disk. Thus, in the absence of the disk, no X-ray should be detected.
Aims: …