Search Publications
The early B-type star Rho Ophiuchi A is an X-ray lighthouse
Reale, Fabio; Wolk, Scott J.; Pillitteri, Ignazio +1 more
We present the results of a 140 ks XMM-Newton observation of the B2 star ρ Oph A. The star has exhibited strong X-ray variability: a cusp-shaped increase of rate, similar to that which we partially observed in 2013, and a bright flare. These events are separated in time by about 104 ks, which likely correspond to the rotational period of the star …
The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394
Henning, Thomas; Brandner, Wolfgang; Calissendorff, Per +6 more
We combine new Lucky Imaging astrometry from New Technology Telescope/AstraLux Sur with already published astrometry from the AstraLux Large M-dwarf Multiplicity Survey to compute orbital elements and individual masses of the 2MASS J10364483+1521394 triple system belonging to the Ursa-Major moving group. The system consists of one primary low-mass…
Galaxy kinematics in the XMMU J2235-2557 cluster field at z 1.4
Böhm, A.; Tanaka, M.; Ziegler, B. +2 more
Aims: The relationship between baryonic and dark components in galaxies varies with the environment and cosmic time. Galaxy scaling relations describe strong trends between important physical properties. A very important quantitative tool in case of spiral galaxies is the Tully-Fisher relation (TFR), which combines the luminosity of the stell…
A deeper view of the CoRoT-9 planetary system. A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering
Aigrain, S.; Alonso, R.; Bordé, P. +27 more
Complete spectral energy distribution of the hot, helium-rich white dwarf RX J0503.9-2854
Hoyer, D.; Rauch, T.; Werner, K. +2 more
Context. In the line-of-sight toward the DO-type white dwarf
Evolution of the anti-truncated stellar profiles of S0 galaxies since z = 0.6 in the SHARDS survey. I. Sample and methods
Barro, Guillermo; Pérez-González, Pablo G.; Borlaff, Alejandro +5 more
Context. The controversy about the origin of the structure of early-type S0-E/S0 galaxies may be due to the difficulty of comparing surface brightness profiles with different depths, photometric corrections and point spread function (PSF) effects (which are almost always ignored).
Aims: We aim to quantify the properties of Type-III (anti-trun…
Long-term optical and X-ray variability of the Be/X-ray binary H 1145-619: Discovery of an ongoing retrograde density wave
Mas-Hesse, J. M.; Coe, M. J.; Reig, P. +7 more
Context. Multiwavelength monitoring of Be/X-ray binaries is crucial to understand the mechanisms producing their outbursts. H 1145-619 is one of these systems, which has recently displayed X-ray activity.
Aims: We investigate the correlation between the optical emission and X-ray activity to predict the occurrence of new X-ray outbursts from …
The Wolf-Rayet star population in the dwarf galaxy NGC 625
Walsh, J. R.; Monreal-Ibero, A.; Relaño, M. +4 more
Context. Quantifying the number, type, and distribution of Wolf-Rayet (W-R) stars is a key component in the context of galaxy evolution, since they put constraints on the age of the star formation bursts. Nearby galaxies (distances ≲5 Mpc) are particularly relevant in this context since they fill the gap between studies in the Local Group, where i…
Segmentation of photospheric magnetic elements corresponding to coronal features to understand the EUV and UV irradiance variability
Giono, G.; Zender, J. J.; Kariyappa, R. +5 more
Context. The magnetic field plays a dominant role in the solar irradiance variability. Determining the contribution of various magnetic features to this variability is important in the context of heliospheric studies and Sun-Earth connection.
Aims: We studied the solar irradiance variability and its association with the underlying magnetic fi…
Mid-infrared interferometric variability of DG Tauri : Implications for the inner-disk structure
Jaffe, W.; Ábrahám, P.; Chen, L. +12 more
Context. DG Tau is a low-mass pre-main sequence star, whose strongly accreting protoplanetary disk exhibits a so-far enigmatic behavior: its mid-infrared thermal emission is strongly time-variable, even turning the 10 µm silicate feature from emission to absorption temporarily.
Aims: We look for the reason for the spectral variability a…