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Novel application to estimate the mass-loss and the dust-formation rates in O-type gamma-ray binaries using near-infrared photometry
Moritani, Yuki; Kawachi, Akiko; Okazaki, Atsuo T. +2 more
We have performed the near-infrared photometric monitoring observations of two TeV gamma-ray binaries with O-stars (LS 5039 and 1FGL J1018.6-5856), using IRSF/SIRIUS at SAAO, in order to study the stellar parameters and their perturbations caused by the binary interactions. The whole orbital phase was observed multiple times and no significant var…
Dynamic Study of the Triple Star T Tauri
Romanenko, L. G.; Kiyaeva, O. V.
The triple system of young stars T Tauri was discovered relatively recently and has attracted the attention of numerous researchers. Many papers have been dedicated to the study of the physical properties of the system's stars, which are surrounded by a disk of dust and gas. Our work is focused on the astrometric analysis of this triple system usi…
Searching for overlooked TDEs in the 4XMM catalogue
Risaliti, Guido; Sacchi, Andrea; Miniutti, Giovanni
Tidal disruption events (TDEs) are usually discovered as bright transients, either in the X‑ray or optical/UV band. These events are often characterized by a "super‑soft" emission in the X‑ray band, which has not been observed in any other extragalactic source, with few exceptions (novae and supersoft active galactic nuclei, AGN), which can howeve…
New Insight into the FS CMa System MWC 645 from Near-Infrared and Optical Spectroscopy
Kraus, Michaela; Arias, María Laura; Eenmäe, Tõnis +2 more
The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of mat…
Search of nearby resolved neutron stars among optical sources
Bihain, Gabriel
Neutron stars are identified as pulsars, X-ray binary components, central objects of supernovae remnants, or isolated thermally emitting sources and at distances beyond 120 pc. A population extrapolation suggests 103 objects within that boundary. Potentially, neutron stars could continuously emit gravitational waves at sensitivity reach…
Vela X-1 in depth: a review article on an outstanding object
Degenaar, N.; Utrilla, E.; Ramos-Lerate, M. +9 more
The paper - https://ui.adsabs.harvard.edu/abs/2021A%26A...652A..95K/abstract {Revisiting the archetypical wind accretor Vela X-1 in depth}. Case study of a well-known X-ray binary and the limits of our knowledge - provided a thoughtful compilation of the knowledge of the Vela X-1 system and its modelling published over decades; added new informati…
Formation of a Massive Lenticular Galaxy Under the Tidal Interaction with a Group of Dwarf Galaxies
Zhang, Chuan-Peng; Xu, Jin-Long; Zhu, Ming +6 more
Based on the atomic-hydrogen (H I) observations using the Five-hundred-meter Aperture Spherical radio Telescope, we present a detailed study of the gas-rich massive S0 galaxy NGC 1023 in a nearby galaxy group. The presence of a H I extended warped disk in NGC 1023 indicates that this S0 galaxy originated from a spiral galaxy. The data also suggest…
Development and coupling test of active spacecraft potential control - Next generation (ASPOC-NG)
Cipriani, Fabrice; Nakamura, Rumi; Steller, Manfred +7 more
The active spacecraft potential control (ASPOC) system developed in the 1990s emits positive ions to neutralise the spacecraft potential, such as used in several missions like Geotail, Equator-S, Cluster, Doublestar and MMS. With the experience gained, the next generation of the active spacecraft potential control (ASPOC-NG) instrument has been de…
BCD spectrophotometry for massive stars in transition phases
Zorec, J.; Borges Fernandes, M.; Kraus, M. +7 more
Context. Stars in transition phases, such as those showing the B[e] phenomenon and luminous blue variables (LBVs), undergo strong, often irregular mass-ejection events. The prediction of these phases in stellar evolution models is therefore extremely difficult, if not impossible. As a result, their effective temperatures, their luminosities, and e…
Investigations of late-type giant stars from the First Byurakan Spectral Sky Survey
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R.
We study late-type giants found in the First Byurakan Survey (FBS) data base. The third Gaia data release (Gaia EDR3) photometric and astrometric data have been used to characterize our sample of 1 100 M-type giants and 130 C-type stars found at high latitudes. Phase dependent light-curves from large sky area variability data bases such as Catalin…