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The 2018 eruption and long-term evolution of the new high-mass Herbig Ae/Be object Gaia-18azl = VES 263
Munari, U.; Banerjee, D. P. K.; Čotar, K. +10 more
We have been monitoring, at high cadence, the photometric and spectroscopic evolution of VES 263 following the discovery in 2018 of a brightening labelled as event Gaia-18azl. VES 263 is so far a neglected emission-line object discovered in the 1960s on objective prism plates, tentatively classified as a semiregular AGB cool giant by automated ana…
X-ray emission in the enigmatic CVSO 30 system
Schmitt, J. H. M. M.; Schmidt, T. O. B.; Czesla, S. +3 more
CVSO 30 is a young, active, weak-line T Tauri star; it possibly hosts the only known planetary system with both a transiting hot-Jupiter and a cold-Jupiter candidate (CVSO 30 b and CVSO 30 c). We analyzed archival ROSAT, Chandra, and XMM-Newton data to study the coronal emission in the system. According to our modeling, CVSO 30 shows a quiescent X…
Magnetic Stability of Massive Star-forming Clumps in RCW 106
Kusune, Takayoshi; Nakamura, Fumitaka; Tamura, Motohide +6 more
The RCW 106 molecular cloud complex is an active massive star-forming region where a ministarburst is taking place. We examined its magnetic structure by near-IR polarimetric observations with the imaging polarimeter SIRPOL on the IRSF 1.4 m telescope. The global magnetic field is nearly parallel to the direction of the Galactic plane and the clou…
Molecular oxygen generation from the reaction of water cations with oxygen atoms
Fortenberry, Ryan C.; Trabelsi, Tarek; Westbrook, Brent R. +2 more
The oxywater cation (H2OO+), previously shown to form barrierlessly in the gas phase from water cations and atomic oxygen, is proposed here potentially to possess a 2A″ ←4A″ excitation leading to the H2⋯O2+ complex. This complex could then easily decompose into molecular …
Optical Observations of the Nearby Galaxy NGC 2366 Through Narrowband H_alpha and [SII] Filters. Supernova Remnants Status
Vučetić, M. M.; Onić, D.; Petrov, N. +2 more
We present detection of 64 HII regions, three superbubbles and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR candidates were detected by applying [SII]Hα ratio criterion to observations made with the 2-m RCC telescope at Rozhen National Astronomical Observatory in Bulgaria. In this paper we report …
IU Cancri: a solar-type contact binary with mass transfer
Dai, Hai-Feng; Yuan, Hui-Yu; Yang, Yuan-Gui
We present new CCD photometry of the solar-type contact binary IU Cnc, which was observed from November 2017 to March 2018 with three small telescopes in China. BV light curves imply that IU Cnc is a W-type contact binary with total eclipses. The photometric solution indicates that the mass ratio and fill-out factor are q = 4.104 ± 0.004 and f = 3…
QSOs sigposting cluster size halos as gravitational lenses: halo mass, projected mass density profile and concentration at z~0.7
Bonavera, L.; González-Nuevo, J.; Negrello, M. +6 more
Magnification bias is a gravitational lensing effect that is normally overlooked because it is considered sub-optimal in comparison with the lensing shear. Thanks to the demonstrated optimal characteristics of the sub-millimetre galaxies (SMGs) for lensing analysis, in this work we were able to measure the magnification bias produced by a sample o…
Correlation length around Mars: a statistical study with MEX and MAVEN observations
Fränz, Markus; Echer, Ezequiel; Marques de Souza Franco, Adriane +1 more
Asteroseismology of the Pre-main-sequence δ Scuti Pulsator IP Persei
Li, Yan; Chen, Xinghao
A grid of theoretical models are computed to fit the nine oscillation modes of IP Per detected earlier from a multi-site ground-based campaign. Fitting results show that there are two sets of theoretical models that could reproduce the observed frequencies more or less equally as well. In view of other available spectroscopic and photometric measu…
Observational determination of the galaxy bias from cosmic variance with a random pointing survey: clustering of z ∼ 2 galaxies from Hubble's BoRG survey
Cameron, Alex J.; Livermore, Rachael C.; Trenti, Michele +1 more
Gravitational clustering broadens the count-in-cells distribution of galaxies for surveys along uncorrelated (well-separated) lines of sight beyond Poisson noise. A number of methods have proposed to measure this excess `cosmic' variance to constrain the galaxy bias (i.e. the strength of clustering) independently of the two-point correlation funct…