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The Gaia AVU-GSR parallel solver: Preliminary studies of a LSQR-based application in perspective of exascale systems
Lattanzi, M. G.; Becciani, U.; Bucciarelli, B. +6 more
The Gaia Astrometric Verification Unit-Global Sphere Reconstruction (AVU-GSR) Parallel Solver aims to find the astrometric parameters for ∼ 108 stars in the Milky Way, the attitude and the instrumental specifications of the Gaia satellite, and the global parameter γ of the post Newtonian formalism. The code iteratively solves a system o…
The double-lined spectroscopic binary orbit of the massive supergiant HD 152147: A new target for interferometry
Gamen, R.; Barbá, R. H.; Morrell, N. I. +4 more
We present a new spectroscopic orbit of the O-type binary system HD 152147. We identify absorption lines in both components and use their radial velocities to determine the orbit, which results in a period of P = 50.2199 ± 0.0007 d, an eccentricity e = 0.738 ± 0.007, and a mean separation between the components of asin i = 151 ± 1 R⊙. C…
Disentangling the neighbouring pulsars SXP 15.3 and SXP 305
Udalski, A.; Coe, M. J.; Roy, A. +8 more
SXP 15.3 and SXP 305 are two Be X-ray binaries in the Small Magellanic Cloud that are spatially separated by ~7 arcsec. The small separation between these sources has, in the past, resulted in confusion about the origin of the emission from the combined region. We present long-term optical and X-ray monitoring results of both sources, where we stu…
A New Visit to the Variable Stars in M56 and its Colour-Magnitude Diagram Structure
Arellano Ferro, A.; Deras, D.; Yepez, M. A. +1 more
We present a VI CCD photometric study and a membership analysis of the globular cluster M56 (NGC 6779). This produced a CMD decontaminated from field stars, which enabled a better confrontation with theoretical isochrones, zero-age horizontal branches (ZAHB) and post-ZAHB evolutionary tracks. Post He-flash evolutionary models with a He-core mass o…
The outer orbit of the high-mass stellar triple system Herschel 36 determined with the VLTI
Brandner, W.; Pott, J. -U.; Alberdi, A. +8 more
Multiplicity is a ubiquitous characteristic of massive stars. Multiple systems offer us a unique observational constraint on the formation of high-mass systems. Herschel 36 A is a massive triple system composed of a close binary (Ab1-Ab2) and an outer component (Aa). We measured the orbital motion of the outer component of Herschel 36 A using infr…
Updates to the SUMER Spectral Atlas
Wilhelm, Klaus; Schühle, Udo; Curdt, Werner +3 more
We present a reworked version of the SUMER spectral atlas (Curdt et al., 2001). New identifications are given for more than 100 emission lines; entries were corrected or added to the list. The solar emission curve - spectral radiance versus wavelength - in the SUMER spectral range is now available in digital format as electronic supplementary mate…
Study of UV bright sources in globular cluster NGC 4590 using Ultraviolet Imaging Telescope (UVIT) observations
Pradhan, Ananta C.; Mohapatra, Abhisek; Parthasarathy, M. +5 more
We have studied ultraviolet (UV) bright sources in the Galactic globular cluster (GGC) NGC 4590 using Ultraviolet Imaging Telescope onboard the AstroSat satellite. Using UV-optical colour-magnitude diagrams (CMDs), we have identified and characterized the sources of different evolutionary stages i.e. blue horizontal branch stars (BHBs), extremely …
Magnetic fields and young stellar objects in cometary cloud L1616
Soam, Archana; Saha, Piyali; Gopinathan, Maheswar +3 more
The Lynds' Dark Nebula (LDN) 1615/1616 and CB 28 (hereafter L1616) together form a cometary globule located at an angular distance of about 8° west of the Orion OB1 association, aligned roughly along the east-west direction, and showing a distinct head-tail structure. The presence of massive stars in the Orion belt has been considered to be respon…
Variable Star Population in the Open Cluster NGC 6819 Observed by the Kepler Spacecraft
Németh, P.; Baran, A. S.; Sanjayan, S. +1 more
We present the list of variable stars we found in the Kepler superstamp data covering approximately nine arcminutes from the central region of NGC 6819. This is a continuation of our earlier work. We classified the variable stars based on the variability type and we established their cluster membership based on the available Gaia Data Release 3 as…
The MICROSCOPE space mission: the first test of the equivalence principle in a space laboratory
Bergé, Joel; Chhun, Ratana; Métris, Gilles +4 more
This paper introduces the current special issue focussed on the MICROSCOPE mission. This mission is the first experimental test in space of the weak equivalence principle (WEP) using man-made test-masses-as opposed to astronomical tests-with the goal to reach a precision two orders of magnitude better than ground-based experiments. Selected in 199…