Search Publications
Correction to: Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior
Cantat-Gaudin, T.; Moitinho, A.; Paunzen, E. +4 more
X-ray plasma flow and turbulence in the colliding winds of WR140
Hamaguchi, Kenji; Miyamoto, Asca; Sugawara, Yasuharu +5 more
We analyse the XMM-Newton RGS spectra of Wolf-Rayet (WR) 140, an archetype long-period eccentric WR+O colliding wind binary. We evaluate the spectra of O and Fe emission lines and find that the plasmas emitting these lines have the largest approaching velocities with the largest velocity dispersions between phases 0.935 and 0.968 where the inferio…
Two dynamically discovered compact object candidate binary systems from LAMOST low-resolution survey
Gu, Wei-Min; Yi, Tuan; Zhang, Zhi-Xiang +3 more
We report two binary systems, LAMOST J035540 + 381550 (hereafter J035540) and LAMOST J035916 + 400732 (hereafter J035916), identified through the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution survey (LRS). Each of these two systems contains an M-type star orbiting with a invisible compact object candidate. Follo…
HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
Hellier, Coel; Latham, David W.; Littlefield, Colin +49 more
We report the discovery and validation of HD 21520 b, a transiting planet found with Transiting Exoplanet Survey Satellite and orbiting a bright G dwarf (V = 9.2,
Coma and tail of Comet 67P/Churyumov-Gerasimenko during the 2021-2022 apparition
Lara, Luisa; Gray, Zuri; Bagnulo, Stefano +1 more
We present results on the global activity of comet 67P/Churyumov-Gerasimenko (67P), the ROSETTA target, during its first perihelion passage after the mission and after an encounter with planet Jupiter. 67P was observed by broad-band filter imaging at 33 epochs during 2021 May 21 to 2022 June 1. The mean radial flux profiles suggest that 'equilibri…
Horizontal branch structure, age, and chemical composition for very metal-poor extragalactic globular clusters
Sharina, M. E.; Kniazev, A. Y.; Shimansky, V. V. +2 more
This paper presents the results of analysing the integrated light (IL) low-resolution spectra of globular clusters (GCs) in the M31 and Centaurus A groups of galaxies. The sample consists of eight very metal-poor GCs ($\rm [Fe/H]\le -2$ dex) with high signal-to-noise ratio spectra acquired with the telescopes: the 6-m SAO RAS (BTA), the Southern A…
Multitechnique study of the B[e] supergiant RMC 82
Carciofi, A. C.; Seriacopi, D. B.; de Amorim, T. H. +9 more
B[e] supergiants (sgB[e]) are rare objects whose evolutionary stage remains uncertain. Observationally, they display strong Balmer emission lines, infrared excess, and intrinsic polarization, indicating a non-spherical circumstellar envelope. We present a study of the sgB[e] RMC 82, using new spectropolarimetric data complemented by photometry fro…
Asteroseismic modelling of the chemically peculiar B-type pulsator with an asymptotic period spacing - a Cen
Walczak, Przemysław; Kopacz, Agnieszka
A Cen is recognized as a magnetic variable star with peculiar helium abundance. The presence of large surface spots induces flux modulation, allowing for the derivation of the surface rotational period (~8.8 d). TESS photometry has unveiled additional signals that we interpreted as SPB-type pulsation. Furthermore, we managed to find a regular peri…
On the nature of the eccentric eclipsing binary star SY Phe with a pulsating γ Dor component
Erdem, Ahmet; Sürgit, Derya; Engelbrecht, Chris A. +3 more
Spectroscopic observations of the eccentric binary system SY Phe were made at the South African Astronomical Observatory in 2019, 2020, and 2021, and its mid-resolution spectra were obtained. The radial velocities of the component stars were measured using the cross-correlation method and Fourier disentangling of the spectra. The spectral type (he…
The miniJPAS survey. Multiwavelength exploration of detected Extreme Emission Line Galaxies
Mendes de Oliveira, Claudia; Benítez, Narciso; Amarantidis, Stergios +24 more
Extreme Emission Line Galaxies (EELGs) stand as remarkable objects due to their extremely metal poor environment and intense star formation. Considered as local analogues of high-redshift galaxies in the peak of their star-forming activity, they offer insights into conditions prevalent during the early Universe. Assessment of their stellar and gas…