Search Publications
Solving the distance discrepancy for the open cluster NGC 2453. The planetary nebula NGC 2452 is not a cluster member
Silva-Villa, E.; Moitinho, A.; Moni Bidin, C. +6 more
Context. The open cluster (OC) NGC 2453 is of particular importance since it has been considered to host the planetary nebula (PN) NGC 2452, however their distances and radial velocities are strongly contested.
Aims: In order to obtain a complete picture of the fundamental parameters of the OC NGC 2453, 11 potential members were studied. The …
Molecular environs and triggered star formation around the large Galactic infrared bubble N 24
Li, Dalei; Tang, Xindi; Zhou, Jianjun +10 more
A multi-wavelength analysis of the large Galactic infrared bubble N 24 is presented in this paper in order to investigate the molecular and star-formation environment around expanding H II regions. Using archival data from Herschel and ATLASGAL, the distribution and physical properties of the dust over the entire bubble are studied. Using the Clum…
The Complex Nature of Magnetic Element Transport in the Quiet Sun: The Lévy-walk Character
Giannattasio, F.; Berrilli, F.; Consolini, G. +1 more
The study of the dynamic properties of small-scale magnetic fields in the solar photosphere (magnetic elements, MEs) provides a fundamental tool to investigate some still unknown aspects of turbulent convection, and gain information on the spatial and temporal scales of evolution of the magnetic field in the quiet Sun. We track the MEs in a set of…
Estimating the solar wind pressure at comet 67P from Rosetta magnetic field measurements
Madanian, Hadi; Timar, Aniko; Nemeth, Zoltan +3 more
Aims: The solar wind pressure is an important parameter of space weather, which plays a crucial role in the interaction of the solar wind with the planetary plasma environment. Here we investigate the possibility of determining a solar wind pressure proxy from Rosetta magnetic field data, measured deep inside the induced magnetosphere of comet 67P…
High-mass Star Formation in the nearby Region G352.630-1.067. I. Parallax
Chen, Xi; Xu, Ye; Zhang, Bo +5 more
Young or forming high-mass stars that are nearby and not within a cluster environment have the potential to provide fundamental insights into star formation. In this paper we report such a candidate (G352.630-1.067), for which we have measured the distance through very long baseline interferometry parallax observations of the associated 6.7 GHz cl…
WASP-92, WASP-93, and WASP-118: transit timing variations and long-term stability of the systems
Evans, Phil; Gajdoš, Pavol; Vaňko, Martin +8 more
We studied three exoplanetary systems with transiting planets: WASP-92, WASP-93, and WASP-118. Using ground-based photometric observations of WASP-92 and WASP-93 and Kepler-K2 observations of WASP-118, we redetermined the orbital and physical parameters of these planets. The precise times of all transits were determined. We constructed O-C diagram…
Exploring the Interstellar Medium Using an Asymmetric X-Ray Dust Scattering Halo
Li, Guangxing; Jin, Chichuan; Ponti, Gabriele +1 more
SWIFT J1658.2-4242 is an X-ray transient discovered recently in the Galactic plane, with severe X-ray absorption corresponding to an equivalent hydrogen column density of ∼2 × 1023 cm-2. Using new Chandra and XMM-Newton data, we discover a strong X-ray dust scattering halo around it. The halo profile can be well fitted by the…
Constraining X-Ray Coronal Size with Transverse Motion of AGN Ultra-fast Outflows
Tombesi, Francesco; Fukumura, Keigo
One of the canonical physical properties of ultra-fast outflows (UFOs) seen in a diverse population of active galactic nuclei is its seemingly very broad width (i.e., Δv ≳ 10,000 km s-1), a feature often required for X-ray spectral modeling. While unclear to date, this condition is occasionally interpreted and justified as internal turb…
Magnetic activities on active solar-type stars
Pandey, J. C.; Raj, A.; Savanov, I. S. +2 more
We present results obtained from the studies of magnetic activities on four solar-type stars (F-type star KIC 6791060, K-type star LO Peg, and two M-type planet-hosting stars K2-33 and EPIC 211901114) by using optical observations from several ground- and space-based telescopes. In this study, we investigate magnetic activities such as spot-topogr…
A multiwavelength study of filamentary cloud G341.244-00.265
Wang, Jun-Jie; Yu, Nai-Ping; Xu, Jing-Long
We present a multiwavelength study toward the filamentary molecular cloud G341.244-00.265, to investigate the physical and chemical properties, as well as star formation activities taking place therein. Our radio continuum and molecular line data were obtained from the Sydney University Molonglo Sky Survey (SUMSS), Atacama Pathfinder Experiment Te…