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KIC 8975515: A fast-rotating (γ Dor - δ Sct) hybrid star with Rossby modes and a slower δ Sct companion in a long-period orbit
Jofré, P.; Lampens, P.; Samadi-Ghadim, A. +1 more
Aims: KIC 8975515 is a double-lined spectroscopic binary system with hybrid nature. Regular monitoring with the échelle spectrograph HERMES show that both components have matching atmospheric properties (Teff ∼ 7400 K), and that one of them is a fast rotator (v sin i = 162 versus 32 km s-1). Our aim is to study the Keple…
CHEOPS observations of TESS primary mission monotransits
Lendl, Monika; Pollacco, Don; Cooke, Benjamin F. +2 more
We set out to look at the overlap between CHaracterizing ExOPlanets Satellite (CHEOPS) sky coverage and Transiting Exoplanet Survey Satellite (TESS) primary mission monotransits to determine what fraction of TESS monotransits may be observed by CHEOPS. We carry out a simulation of TESS transits based on the stellar population in TICv8 in the prima…
Temporal and Spatial Scales in Coronal Rain Revealed by UV Imaging and Spectroscopic Observations
Toriumi, Shin; Antolin, Patrick; Katsukawa, Yukio +1 more
Coronal rain corresponds to cool and dense clumps in the corona accreting towards the solar surface; it is often observed above solar active regions. These clumps are generally thought to be produced by a thermal instability in the corona and their lifetime is limited by the time they take to reach the chromosphere. Although the rain usually fragm…
NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit
Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano +35 more
We report the discovery of the transiting exoplanet NGTS-12b by the Next Generation Transit Survey (NGTS). The host star, NGTS-12, is a V = 12.38 mag star with an effective temperature of Teff = 5690 ± 130 K. NGTS-12b orbits with a period of P = 7.53 d, making it the longest period planet discovered to date by the main NGTS survey. We v…
The young stellar content of the giant H II regions M 8, G333.6-0.2, and NGC 6357 with VLT/KMOS
Henning, T.; Kaper, L.; De Ridder, J. +14 more
Context. The identification and characterisation of populations of young massive stars in (giant) H II regions provides important constraints on (i) the formation process of massive stars and their early feedback on the environment, and (ii) the initial conditions for population synthesis models predicting the evolution of ensembles of stars.
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Electron-positron pair plasma in TXS 0506+056 and the 'neutrino flare' in 2014-2015
Fraija, N.; Aguilar-Ruiz, E.; Galván-Gámez, A.
The detection of a prolonged flaring activity from blazar TXS 0506+056 in temporal and spatial coincidence with the energetic neutrino IceCube-170922A provided evidence about the photohadronic interactions in this source. However, analysis of the archival neutrino and multiwavelength data from the direction of this blazar between 2014 September an…
Stellar activity with LAMOST. III. Temporal variability pattern in Pleiades, Praesepe, and Hyades
Zhao, Gang; Bharat Kumar, Yerra; Bidin, Christian Moni +2 more
We present the results from a systematic study of temporal variation of stellar activity in young late-type stars. We used multi-epoch LAMOST (Large sky Area Multi-Object fiber Spectroscopic Telescope) low-resolution spectra of over 300 member candidates in three young open clusters: Pleiades, Praesepe, and Hyades. The spectral measurements of TiO…
The OH Megamaser galaxy IRAS11506-3851: an AGN and star formation revealed by multiwavelength observations
Robinson, Andrew; Storchi-Bergmann, Thaisa; Riffel, Rogemar A. +4 more
We present Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST), and Very Large Array (VLA) observations of the OH Megamaser (OHM) galaxy IRAS 11506-3851. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions and VLA data allow us to identify a partial ri…
Successful application of PSF-R techniques to the case of the globular cluster NGC 6121 (M 4)
Massari, D.; Fiorentino, G.; Milli, J. +4 more
Context. Precise photometric and astrometric measurements on astronomical images require an accurate knowledge of the point spread function (PSF). When the PSF cannot be modelled directly from the image, PSF-reconstruction techniques become the only viable solution. So far, however, their performance on real observations has rarely been quantified…
Performance of VERA in 10 micro-arcsecond astrometry
Hirota, Tomoya; Honma, Mareki; Nakagawa, Akiharu +9 more
Very Long Baseline Interferometry (VLBI) astrometry using the phase-referencing technique remains an open issue for the quantitative characterization of the observing conditions to achieve a feasible parallax precision of 10 micro-arcseconds (µas). To address this issue, we evaluated the astrometric performance of the VLBI Exploration of Rad…