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Flickering of the jet‑ejecting symbiotic star MWC 560
Stoyanov, K. A.; Latev, G.; Boeva, S. +4 more
We analyzed the optical photometric data of short‑term variability (flickering) of the accreting white dwarf in the jet‑ejecting symbiotic star MWC 560. The observations were obtained on 17 nights during the period November 2011 to October 2019. The color‑magnitude diagram shows that the hot component of the system becomes redder as it gets bright…
Eruptions from coronal hole bright points: Observations and non-potential modelling
Madjarska, Maria S.; Mackay, Duncan H.; Galsgaard, Klaus +2 more
Context. We report on the third part of a series of studies on eruptions associated with small-scale loop complexes named coronal bright points (CBPs).
Aims: A single case study of a CBP in an equatorial coronal hole with an exceptionally large size is investigated to expand on our understanding of the formation of mini-filaments, their desta…
Spectropolarimetric follow-up of 8 rapidly rotating, X-ray bright FK Comae candidates
Wade, G. A.; Mason, E.; Sikora, J. +2 more
Our understanding of the evolved, rapidly rotating, magnetically active, and apparently single FK Comae stars is significantly hindered by their extreme rarity: only two stars in addition to FK Com itself are currently considered to be members of this class. Recently, a sample of more than 20 candidate FK Comae type stars was identified within the…
Yonsei Evolutionary Population Synthesis (YEPS) Model. III. Surface Brightness Fluctuation of Normal and Helium-enhanced Simple Stellar Populations
Chung, Chul; Lee, Sang-Yoon; Yoon, Suk-Jin +2 more
We present an evolutionary population synthesis model of the surface brightness fluctuation (SBF) for normal and He-enriched simple stellar populations (SSPs). While our SBF model for the normal He population agrees with other existing models, the He-rich population, containing hotter horizontal branch stars and brighter red clump stars than the n…
Dynamical Masses for the Pleiades Binary System HII-2147
Torres, Guillermo; Crepp, Justin R.; Dupuy, Trent J. +3 more
We report our long-term spectroscopic monitoring of the Pleiades member HII-2147, which was previously spatially resolved at radio wavelengths in very long baseline interferometry (VLBI) observations. It has also been claimed to be a (presumably short-period) double-lined spectroscopic binary with relatively sharp lines, although no orbit has ever…
Constraining spatial pattern of early activity of comet 67P/C-G with 3D modelling of the MIRO observations
Keller, H. U.; Hartogh, P.; Rezac, L. +3 more
Our aim is to investigate early activity (2014 July) of 67P/C-G with 3D coma and radiative transfer modeling of Microwave Instrument on the Rosetta Orbiter (MIRO) measurements, accounting for nucleus shape, illumination, and orientation of the comet. We investigate MIRO line shape information for spatial distribution of water activity on the nucle…
Spectroscopic characterization of nine binary star systems as well as HIP 107136 and HIP 107533
Neuhäuser, R.; Mugrauer, M.; Bischoff, R. +6 more
We present the results of our second radial velocity (RV) monitoring campaign, carried out with the Échelle spectrograph FLECHAS at the University Observatory Jena in the course of the Großschwabhausen binary survey between December 2016 and June 2018. The aim of this project is to obtain precise RV measurements for spectroscopic binary stars in o…
Wide field-of-view study of the Eagle Nebula with the Fourier transform imaging spectrograph SITELLE at CFHT
Prunet, S.; McLeod, A. F.; Flagey, N. +1 more
Context. We present the very first wide-field, 11' by 11', optical spectral mapping of M 16, one of the most famous star-forming regions in the Galaxy. The data were acquired with the new imaging Fourier transform spectrograph SITELLE mounted on the Canada-France-Hawaii Telescope (CFHT). We obtained three spectral cubes with a resolving power of 1…
Pyroxene chemistry and crystallization history of basaltic units in the Mare Humorum on the nearside of the Moon: Implications for the volcanic history of the region
Rajesh, V. J.; Thesniya, P. M.
Mare basalts are volcanic features on the lunar surface and are vital for understanding the Moon's volcanic and thermal history. The present study investigates the mineralogy and chemical variations of the mare basaltic units in the Mare Humorum on the Moon's nearside using orbital remote sensing data from recent lunar exploration missions. The pr…
Unraveling the Nature of the Deeply Embedded Wolf-Rayet Star WR 121a
Pandey, J. C.; Arora, Bharti
An X-ray study of the deeply embedded Wolf-Rayet star WR 121a has been carried out using long-term (spanning over ∼12 yr) archival observations from Chandra and XMM-Newton. For the first time, a periodic variation of 4.1 days has been detected in the X-ray light curve of WR 121a. No companion is seen in a merged and exposure-corrected Chandra X-ra…