Search Publications
Discovery of a 26.2 day period in the long-term X-ray light curve of SXP 1323: a very short orbital period for a long spin period pulsar
Haberl, F.; Sturm, R.; Carpano, S.
Context. About 120 Be/X-ray binaries (BeXBs) are known in the Small Magellanic Cloud (SMC); about half of them are pulsating with periods from a few to hundreds of seconds. SXP 1323 is one of the longest-period pulsars known in this galaxy.
Aims: SXP 1323 is in the field of view of a large set of calibration observations that we analyse syste…
Constraining the thin disc initial mass function using Galactic classical Cepheids
Lemasle, B.; Figueras, F.; Mor, R. +1 more
Context. The initial mass function (IMF) plays a crucial role in galaxy evolution and its implications on star formation theory make it a milestone for the next decade. It is in the intermediate and high mass ranges where the uncertainties of the IMF are larger. This is a major subject of debate and analysis both for Galactic and extragalactic sci…
EXTraS discovery of two pulsators in the direction of the LMC: a Be/X-ray binary pulsar in the LMC and a candidate double-degenerate polar in the foreground
Salvaterra, R.; Haberl, F.; Tiengo, A. +10 more
Context. The Exploring the X-ray Transient and variable Sky (EXTraS) project searches for coherent signals in the X-ray archival data of XMM-Newton.
Aims: XMM-Newton performed more than 400 pointed observations in the region of the Large Magellanic Cloud (LMC). We inspected the results of the EXTraS period search to systematically look for ne…
Results from a triple chord stellar occultation and far-infrared photometry of the trans-Neptunian object (229762) 2007 UK126
Kiss, C.; Ortiz, J. L.; Braga-Ribas, F. +8 more
Context. A stellar occultation by a trans-Neptunian object (TNO) provides an opportunity to probe the size and shape of these distant solar system bodies. In the past seven years, several occultations by TNOs have been observed, but mostly from a single location. Only very few TNOs have been sampled simultaneously from multiple locations. Sufficie…
Evidence for different accretion regimes in GRO J1008-57
Rothschild, Richard E.; Fürst, Felix; Klochkov, Dmitry +6 more
We present a comprehensive spectral analysis of the BeXRB
What is the Milky Way outer halo made of?. High resolution spectroscopy of distant red giants
Minniti, D.; Jablonka, P.; Starkenburg, E. +5 more
In a framework where galaxies form hierarchically, extended stellar haloes are predicted to be an ubiquitous feature around Milky Way-like galaxies and to consist mainly of the shredded stellar component of smaller galactic systems. The type of accreted stellar systems are expected to vary according to the specific accretion and merging history of…
Monopole and dipole estimation for multi-frequency sky maps by linear regression
Banday, A. J.; Dickinson, C.; Eriksen, H. K. +9 more
We describe a simple but efficient method for deriving a consistent set of monopole and dipole corrections for multi-frequency sky map data sets, allowing robust parametric component separation with the same data set. The computational core of this method is linear regression between pairs of frequency maps, often called T-T plots. Individual cont…
Chemical composition of the stellar cluster Gaia1: no surprise behind Sirius
Bonifacio, P.; Saviane, I.; Monaco, L. +1 more
We observed six He-clump stars of the intermediate-age stellar cluster Gaia1 with the MIKE/Magellan spectrograph. A possible extra-galactic origin of this cluster, recently discovered thanks to the first data release of the ESA Gaia mission, has been suggested, based on its orbital parameters. Abundances for Fe, α, proton- and neutron-capture elem…
Towards the origin of the radio emission in AR Scorpii, the first radio-pulsing white dwarf binary
Marsh, T. R.; Marcote, B.; Stanway, E. R. +2 more
Context. The binary system AR Sco contains an M star and the only known radio-pulsing white dwarf. The system shows emission from radio to X-rays, likely dominated by synchrotron radiation. The mechanism that produces most of this emission remains unclear. Two competing scenarios have been proposed: collimated outflows, and direct interaction betw…
Limits to the presence of transiting circumbinary planets in CoRoT Data
Csizmadia, Sz.; Cabrera, J.; Klagyivik, P. +2 more
Aims: During its flight phase, from 2007-2012, the CoRoT mission delivered light curves for over 2000 eclipsing binaries. Data from the Kepler mission have proven the existence of several transiting circumbinary planets. While light curves from CoRoT typically have lower precision and shorter coverage, the number of CoRoT targets is similar t…