Search Publications
Two new magnetic cataclysmic variables discovered in the 3XMM catalogue
Schwope, A.; Webb, N. A.; Rosen, S. R. +2 more
Context. X-ray catalogues provide a wealth of information on many source types, ranging from compact objects to galaxies, clusters of galaxies, stars, and even planets. Thanks to the huge volume of X-ray sources provided in the 3XMM catalogue, along with many source specific products, many new examples from rare classes of sources can be identifie…
Massive young stellar objects in the N 66/NGC 346 region of the SMC
Barbá, R. H.; Rubio, M.; Kalari, V. M.
We present HK spectra of three sources located in the N 66 region of the Small Magellanic Cloud. The sources display prominent stellar Brγ and extended H2 emission, and exhibit infrared excesses at λ > 2 µm. Based on their spectral features, and photometric spectral energy distributions, we suggest that these sources are massiv…
New nearby white dwarfs from Gaia DR1 TGAS and UCAC5/URAT
Jahreiß, H.; Meusinger, H.; Scholz, R. -D.
Aims: Using an accurate Tycho-Gaia Astrometric Solution (TGAS) 25 pc sample that is nearly complete for GK stars and selecting common proper motion (CPM) candidates from the 5th United States Naval Observatory CCD Astrograph Catalog (UCAC5), we search for new white dwarf (WD) companions around nearby stars with relatively small proper motions…
Identifying blue large-amplitude pulsators in the Galactic plane using Gaia DR2: a case study
Ramsay, G.
Blue large-amplitude pulsators (BLAPs) are blue stars emitting high-amplitude (> 0.2 mag) pulsations on a timescale of a few tens of minutes. Recently discovered using OGLE data, they form a new class of variable star and have inspired a number of investigations searching for the origin of their pulsations. This short study presents the Gaia DR…
Modelling the carbon AGB star R Sculptoris. Constraining the dust properties in the detached shell based on far-infrared and sub-millimeter observations
Mecina, M.; Kerschbaum, F.; Maercker, M. +2 more
Context. On the asymptotic giant branch (AGB), Sun-like stars lose a large portion of their mass in an intensive wind and enrich the surrounding interstellar medium with nuclear processed stellar material in the form of molecular gas and dust. For a number of carbon-rich AGB stars, thin detached shells of gas and dust have been observed. These she…
Multiepoch, multiwavelength study of accretion onto T Tauri. X-ray versus optical and UV accretion tracers
Schmitt, J. H. M. M.; Güdel, M.; Robrade, J. +2 more
Classical T Tauri stars (CTTSs) accrete matter from the inner edge of their surrounding circumstellar disks. The impact of the accretion material on the stellar atmosphere results in a strong shock, which causes emission from the X-ray to the near-infrared (NIR) domain. Shock velocities of several 100 km s-1 imply that the immediate pos…
Planetary nebulae with UVIT. II. Revelations from far-UV vision of Butterfly nebula NGC 6302
Sutaria, F.; Murthy, J.; Ray, A. +4 more
The high excitation planetary nebula, NGC 6302, has been imaged in two far-ultraviolet (FUV) filters, F169M (Sapphire; λeff: 1608 Å) and F172M (Silica; λeff: 1717 Å) and two near-UV (NUV) filters, N219M (B15; λeff: 2196 Å) and N279N (N2; λeff: 2792 Å) with the Ultra Violet Imaging Telescope (UVIT). The F…
Eclipsing spotted giant star with K2 and historical photometry
Vanderburg, A.; Rappaport, S.; Bieryla, A. +15 more
Context. Stars can maintain their observable magnetic activity from the pre-main sequence (PMS) to the tip of the red giant branch. However, the number of known active giants is much lower than active stars on the main sequence (MS) since the stars spend only about 10% of their MS lifetime on the giant branch. Due to their rapid evolution it is di…
Non-synchronous rotations in massive binary systems. HD 93343 revisited
Simón-Díaz, S.; Gamen, R.; Barbá, R. H. +5 more
Context. Most massive stars are in binary or multiple systems. Several massive stars have been detected as double-lined spectroscopic binaries and among these, the OWN Survey has detected a non-negligible number whose components show very different spectral line broadening (i.e., projected rotational velocities). This fact raises a discussion abou…
Data calibration for the MASCARA and bRing instruments
Snellen, I. A. G.; Mamajek, E. E.; Kenworthy, M. A. +8 more
Aims: MASCARA and bRing are photometric surveys designed to detect variability caused by exoplanets in stars with mV < 8.4. Such variability signals are typically small and require an accurate calibration algorithm, tailored to the survey, in order to be detected. This paper presents the methods developed to calibrate the raw ph…