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Young star clusters and the structure of the second Galactic quadrant II
Molina Lera, J. A.; Baume, G.; Gamen, R.
Galactic spiral arms are traced using young objects as giant molecular clouds, H II regions, OB stars, or young open/embedded clusters. To improve the knowledge of the Galactic structure in the second quadrant we selected, from more than 200 open clusters covered by the SDSS, a sample of 10 young stellar clusters to conduct a spectrophotometric st…
A study of accretion and disk diagnostics in the NGC 2264 cluster
Alencar, Silvia H. P.; Calvet, Nuria; Sousa, Alana P. +3 more
Context. Understanding disk dissipation is essential for studying how planets form. Disk gaps and holes, which almost correspond to dust-free regions, are inferred from infrared observations of T Tauri stars (TTS), indicating the existence of a transitional phase between thick accreting disks and debris disks. Transition disks are usually referred…
Inquiring into the nature of the Abell 2667 brightest cluster galaxy: physical properties from MUSE
Berta, S.; Popesso, P.; Rodighiero, G. +21 more
Based on HST and MUSE data, we probe the stellar and gas properties (i.e. kinematics, stellar mass, star formation rate) of the radio-loud brightest cluster galaxy (BCG) located at the centre of the X-ray-luminous cool-core cluster Abell 2667 (z = 0.2343). The bi-dimensional modelling of the BCG surface brightness profile reveals the presence of a…
On the possibilities of classical nova identifications among historical Far Eastern guest star observations
Hoffmann, Susanne M.; Vogt, Nikolaus; Tappert, Claus
More than 100 guest star observations have been obtained by Chinese, Korean, Japanese, and Vietnamese astronomers between ∼600 BCE and ∼1690 CE. Comparing the coordinates from the information given in old texts for eight supernova recoveries with modern supernova remnant positions, we estimate the typical positional accuracy of the order of 0.3–7°…
Islands of ice on Mars and Pluto
Bapst, Jonathan; Byrne, Shane; Becerra, Patricio +1 more
Ice sheets, such as the polar layered deposits (PLDs) of Mars, are of great interest as records of past climate. Smaller outlier ice deposits near the north and south PLDs are likely more sensitive to climate changes and thus may hold information about more recent climate history. However, the southern outlier deposits have largely remained unmapp…
Heterogeneous evolution of the Galaxy and the origin of the short-lived nuclides in the early solar system
Kaur, Tejpreet; Sahijpal, Sandeep
We present Galactic chemical evolution (GCE) models of the short-lived radionuclides (SLRs), 26Al, 36Cl, 41Ca, 53Mn, and 60Fe, across the entire Milky Way galaxy. The objective is to understand the spatial and temporal distribution of the SLRs in the galaxy. The gamma-ray observations infer wi…
Vertical and horizontal heterogeneity of atmospheric dust loading in northern Gale Crater, Mars
Lemmon, Mark T.; Newman, Claire E.; Moore, Casey A. +3 more
This paper updates the record of atmospheric dust loading within northern Gale Crater, Mars, by providing line-of-sight extinction (LOS-Ext) measurements of the intervening dust between the rover and the crater rim. These measurements are derived from images taken with the Navigation Cameras (Navcam) onboard the Mars Science Laboratory (MSL) rover…
Characteristics of the Solar Coronal Line Profiles from Fabry-Perot Interferometric Observations
Chandrasekhar, T.; Raju, K. P.; Prabhakar, Maya
This article reports the analysis of a set of Fabry-Perot interferograms that were studied to probe the physical parameters of the inner solar corona. The observations were carried out in the coronal green line, Fe XIV 5302.86 Å, during the total solar eclipse of 21 June 2001 that occurred in Lusaka, Zambia. The study was performed in the radial r…
The Enhancement of the Energetic Particle Intensities in ICMEs
Li, Gang; Wang, Yuming; Shen, Chenglong +5 more
The behavior of energetic particles in interplanetary coronal mass ejections (ICMEs) is of great interest. In general, due to the relatively closed magnetic structures of ICMEs, the energetic-particle intensities are usually depressed in them. However, previous studies have found some counterexamples. In this work, using protons with energies form…
Analysis of a long-lived, two-cell lightning storm on Saturn
Gurnett, D. A.; Kurth, W. S.; Delcroix, M. +4 more
Lightning storms in Saturn's atmosphere can last for a few days up to several months. In this paper we analyze a lightning storm that raged for seven and a half months at a planetocentric latitude of 35° south from the end of November 2007 until mid-July 2008. Thunderstorms observed by the Cassini spacecraft before this time were characterized by …