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A Classification Catalog of Periodic Variable Stars for LAMOST DR9 Based on Machine Learning
Mei, Ying; Wang, Feng; Deng, Hui +4 more
Identifying and classifying variable stars is essential to time-domain astronomy. The Large Area Multi-Object Fiber Optic Spectroscopic Telescope (LAMOST) acquired a large amount of spectral data. However, there is no corresponding variable source-related information in the data, constraining LAMOST data utilization for scientific research. In thi…
First spectroscopic investigation of anomalous Cepheid variables
Ripepi, V.; Molinaro, R.; Marconi, M. +12 more
Context. Anomalous Cepheids (ACEPs) are intermediate-mass metal-poor pulsators that are mostly discovered in dwarf galaxies of the Local Group. However, recent Galactic surveys, including the Gaia Data Release 3, found a few hundred ACEPs in the Milky Way. Their origin is only poorly understood.
Aims: We aim to investigate the origin and evol…
The Complex Star Formation History of the Halo of NGC 5128 (Cen A)
Javadi, Atefeh; Saremi, Elham; van Loon, Jacco Th. +6 more
NGC 5128 (Cen A) is the nearest giant elliptical galaxy and one of the brightest extragalactic radio sources in the sky, boasting a prominent dust lane and jets emanating from its nuclear supermassive black hole. In this paper, we construct the star formation history (SFH) of two small fields in the halo of NGC 5128: a northeastern field (Field 1)…
The TESS-SPOC FFI target sample explored with Gaia
Bayliss, Daniel; Armstrong, David J.; Rodel, Toby +2 more
The Transiting Exoplanet Survey Satellite (TESS) mission has provided the community with high-precision times-series photometry for ~2.8 million stars across the entire sky via the full frame image (FFI) light curves produced by the TESS Science Processing Operations Center (SPOC). This set of light curves is an extremely valuable resource for the…
X-raying the ζ Tau binary system
Smith, Myron A.; Nazé, Yaël; Rauw, Gregor +2 more
Context. The Be star ζ Tau was recently reported to be a γ Cas analog; that is, it displays an atypical (bright and hard) X-ray emission. The origin of these X-rays remains debated.
Aims: The first X-ray observations indicated a very large absorption of the hot plasma component (NH ~ 1023 cm−2). This is most p…
The enigmatic multiple star VV Ori
Blackford, Mark G.; Southworth, John; Budding, Edwin +6 more
New photometry, including TESS data, have been combined with recent spectroscopic observations of the Orion Ib pulsating triple-star system VV Ori. This yields a revised set of absolute parameters with increased precision. Two different programmes were utilized for the light-curve analysis, with results in predictably close agreement. The agreemen…
Influence of the Jovian Current Sheet Models on the Mapping of the UV Auroral Footprints of Io, Europa, and Ganymede
André, N.; Hue, V.; Rabia, J. +4 more
The in situ characterization of moon-magnetosphere interactions at Jupiter and the mapping of moon auroral footpaths require accurate global models of the magnetospheric magnetic field. In this study, we compare the ability of two widely-used current sheet models, Khurana-2005 (KK2005) and Connerney-2020 (CON2020) combined with the most recent int…
Euclid: High-precision imaging astrometry and photometry from Early Release Observations: I. Internal kinematics of NGC6397 by combining Euclid and Gaia data
Altieri, B.; Cimatti, A.; Baccigalupi, C. +175 more
The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid's cameras is taken into account …
The GAPS programme at TNG. LVII. TOI-5076b: A warm sub-Neptune planet orbiting a thin-to-thick-disk transition star in a wide binary system
Scandariato, G.; Pagano, I.; Winn, J. N. +36 more
Aims: We report the confirmation of a new transiting exoplanet orbiting the star TOI-5076.
Methods: We present our vetting procedure and follow-up observations which led to the confirmation of the exoplanet TOI-5076b. In particular, we employed high-precision TESS photometry, high-angular-resolution imaging from several telescopes, and h…
Gaia23bab: A New EXor
Ábrahám, P.; Nagy, Z.; Schisano, E. +11 more
On 2023 March 6, the Gaia telescope alerted a 2 mag burst from Gaia23bab, a young stellar object in the Galactic plane. We observed Gaia23bab with the Large Binocular Telescope obtaining optical and near-infrared spectra close in time to the peak of the burst, and collected all public multiband photometry to reconstruct the historical light curve.…