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Bayesian Characterization of Main-sequence Binaries in the Old Open Cluster NGC 188
Cohen, Roger E.; von Hippel, Ted; Geller, Aaron M.
The binary fractions of open and globular clusters yield powerful constraints on their dynamical state and evolutionary history. We apply publicly available Bayesian analysis tools to a UBV RIJHK S photometric catalog of the open cluster NGC 188 to detect and characterize photometric binaries along the cluster main sequence. This tech…
AGILE and Konus-Wind Observations of GRB 190114C: The Remarkable Prompt and Early Afterglow Phases
Antonelli, L. A.; Costa, E.; Barbiellini, G. +36 more
GRB 190114C represents a breakthrough for the physics of gamma-ray bursts (GRBs), being the first GRB with delayed emission above 300 GeV, as reported by MAGIC. We present in this paper the sub-MeV/MeV data of the prompt and early afterglow emissions of GRB 190114C, as detected by AGILE and Konus-Wind, in the 20 keV-100 MeV energy range. The first…
The auroral radio emission of the magnetic B-type star ρ-=OphC
Umana, G.; Fossati, L.; Loru, S. +19 more
The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6-16.7 GHz) ATCA measurements of the early-type magnetic star ρ-=OphC, which is a flat-spectrum non-thermal radio source. The ρ-=OphC radio emission is partially circularly polarized with a steep spectral dependence: …
Connecting measurements of solar and stellar brightness variations
Solanki, S. K.; Shapiro, A. I.; Krivova, N. A. +3 more
Context. A comparison of solar and stellar brightness variations is hampered by the difference in spectral passbands that are used in observations, and also by the possible difference in the inclination of the solar and stellar rotation axes from the line of sight.
Aims: We calculate the rotational variability of the Sun as it would be measur…
Statistics of Wide Pre-main-sequence Binaries in the Orion OB1 Association
Tokovinin, Andrei; Petr-Gotzens, Monika G.; Briceño, Cesar
Statistics of low-mass pre-main-sequence binaries in the Orion OB1 association with separations ranging from 0"6 to 20″ (220 to 7400 au at 370 pc) are studied using images from the VISTA Orion mini survey and astrometry from Gaia. The input sample based on the CVSO catalog contains 1137 stars of K and M spectral types (masses between 0.3 and 0.9 $…
Multiple Explanations for the Single Transit of KIC 5951458 Based on Radial Velocity Measurements Extracted with a Novel Matched-template Technique
Kane, Stephen R.; Howard, Andrew W.; Dalba, Paul A. +2 more
Planetary systems that show single-transit events are a critical pathway to increasing the yield of long-period exoplanets from transit surveys. From the primary Kepler mission, KIC 5951458 b (Kepler-456b) was thought to be a single-transit giant planet with an orbital period of 1310 days. However, radial velocity (RV) observations of KIC 5951458 …
On the Metamorphosis of the Bailey Diagram for RR Lyrae Stars
Kovtyukh, V.; Lemasle, B.; Walker, A. R. +37 more
We collected over 6000 high-resolution spectra of four dozen field RR Lyrae (RRL) variables pulsating either in the fundamental (39 RRab) or in the first overtone (9 RRc) mode. We measured radial velocities (RVs) of four strong metallic and four Balmer lines along the entire pulsational cycle and derived RV amplitudes with accuracies better than 1…
Revisiting the Magnetic Field of the L183 Starless Core
Karoly, Janik; Bastien, Pierre; Coudé, Simon +4 more
We present observations of linear polarization from dust thermal emission at 850 µm toward the starless cloud L183. These data were obtained at the James Clerk Maxwell Telescope (JCMT) using the SCUBA-2 camera in conjunction with its polarimeter POL-2. Polarized dust emission traces the plane-of-sky magnetic field structure in the cloud, thu…
The Inner Disk of RY Tau: Evidence of Stellar Occultation by the Disk Atmosphere at the Sublimation Rim from K-band Continuum Interferometry
Monnier, John D.; Kraus, Stefan; Baron, Fabien +13 more
We present models of the inner region of the circumstellar disk of RY Tau that aim to explain our near-infrared (K-band: 2.1 µm) interferometric observations, while remaining consistent with the optical to near-infrared portions of the spectral energy distribution. Our submilliarcsecond-resolution CHARA Array observations are supplemented wi…
Non-stoichiometric amorphous magnesium-iron silicates in circumstellar dust shells. Dust growth in outflows from supergiants
Tamanai, Akemi; Pucci, Annemarie; Dohmen, Ralf +1 more
Aims: We study the growth of dust in oxygen-rich stellar outflows in order to find out to which extent dust growth models can quantitatively reconcile with the quantities and nature of dust as derived from observations of the infrared emission from circumstellar dust shells.
Methods: We use a set of nine well-observed massive supergiants…