Search Publications
Fine structure of the main sequence of NGC 2516 scrutinized with Gaia andASteCA
Perren, G. I.; Pera, M. S.; Navone, H. D. +3 more
The fine structure of the open cluster NGC 2516 is investigated. This is an extended and relatively young open cluster subtending over two degrees in the sky, situated at just a few hundred PARSECs (< 400 pc) from the Sun. We collected Gaia DR2 data (G magnitude down to G=19, BP-RP color index, proper motions, and parallaxes) for more than 400,…
The Milky Way Project: Probing Star Formation with First Results on Yellowballs from DR2
Wolf-Chase, Grace; Kerton, C. R.; Devine, Kathryn +7 more
Yellowballs (YBs) were first discovered during the Milky Way Project (MWP) citizen science initiative. The MWP users noticed compact, yellow regions in Spitzer Space Telescope mid-infrared (MIR) images of the Milky Way plane and asked professional astronomers to explain these "yellow balls." Follow-up work by Kerton et al. determined that YBs like…
The RISOTTO radiative transfer and retrieval pipeline for the analysis of occultation spectra
Montmessin, F.; Ferron, S.; Braude, A. S.
We present a new radiative transfer and retrieval pipeline, referred to as RISOTTO, designed for observations made in occultation geometry. RISOTTO can retrieve accurate vertical profiles of the constituents of a planetary atmosphere using a Bayesian approach while simultaneously correcting for instrumental artefacts and uncertainties. The algorit…
The Solar Orbiter Radio and Plasma Waves (RPW) instrument (Corrigendum)
Hellinger, P.; André, M.; Maksimovic, M. +103 more
Asymmetric Distribution of the Solar Photospheric Magnetic-Field Values
Gao, Peng-Xin; Li, Ke-Jun; Xu, Jing-Chen
Understanding the characteristics of the solar magnetic field is essential for interpreting solar activities and dynamo. In this research, we investigated the asymmetric distribution of the solar photospheric magnetic-field values, using synoptic charts constructed from space-borne high-resolution magnetograms. It is demonstrated that the Lorentzi…
Long-term V (RI)c CCD photometry of pre-main-sequence stars in the association Cepheus OB3
Ibryamov, Sunay; Semkov, Evgeni; Peneva, Stoyanka +1 more
Results from optical CCD photometric observations of 13 pre-main-sequence stars collected during the period from February 2007 to November 2020 are presented. These stars are located in the association Cepheus OB3, in the field of the young star V733 Cephei. Photometric observations, especially concerning the long-term variability of the stars, ar…
A geometrical description for interplanetary propagation of Earth-directed CMEs based on radiative proxies
Salas-Matamoros, C.; Sanchez-Guevara, J.
We present a 3D geometrical model to describe the propagation and expansion of coronal mass ejections (CMEs) in the interplanetary space based on radiative proxies to be implemented in previous procedures that use SXR and microwave emissions to estimate the Earth-directed CME propagation speed. We carefully selected a sample of 45 well-defined CME…
The Detached Binary TW Coronae Borealis
Nelson, Robert H.
New radial velocity and photometric data for TW CrB have been obtained, and Roche-based simultaneous analysis of RV and light curve data for the system has been accomplished for the first time, using the 2003 version of the Wilson-Devinney code. Values for the masses and radii have been obtained: M1 = 1.31 (6) Mʘ, M2
Icarus: In-situ monitoring of the surface degradation on a near-Sun asteroid
Granvik, Mikael; Lehtinen, Tuomas; Bellome, Andrea +1 more
Icarus is a mission concept designed to record the activity of an asteroid during a close encounter with the Sun. The primary science goal of the mission is to unravel the nontrivial mechanism(s) that destroy asteroids on orbits with small perihelion distances. Understanding the destruction mechanism(s) allows us to constrain the bulk composition …
Modeling of emission lines in low-ionization windsof B-type stars
Kraus, M.; Cidale, L. S.; Torres, A. F. +2 more
Motivated by the availability of new observational material provided by Gaia mission, and focused on peculiar B-type stars, we develop a model to simulate the non-LTE line profiles of ionized elements such as Ca II and Mg II. The calculation is performed for a range of effective temperature and surface gravity, for different temperature and veloci…