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New Types of the Chromospheric Anemone Microflares: Case Study
Dumin, Yurii V.; Somov, Boris V.
Chromospheric anemone microflares (AMFs) are transient solar phenomena whose emission regions have a multi-ribbon configuration. As distinct from the so-called "atypical" solar flares, also possessing a few ribbons, the temporal and spatial scales of AMFs are a few times less, and the configuration of their ribbons is more specific (star-like). Th…
Photometric study of five kepler contact binaries
Liu, Liang; Li, Xu-Zhi
A lot of data in time domain were obtained by the Kepler mission, including many contact binaries. Long-term observation lets us obtain more information about the short time scale variation in their light curves or in their orbital periods. Unfortunately, the exposure time is too long (most of them are 30 minutes). Hence, many variations in light …
A survey of extended matter around chromospherically active binary systems
Karakuş, Osman; Ekmekçi, Fehmi
We present an analysis of colour excess (CE) observations for 13 chromospherically active binary systems, together with 27 inactive reference stars of similar spectral types and luminosity classes of the components of these 13 binaries. We used the observations which were made by Johnson-Cousins BVRcIc , 2MASS, and WISE photo…
The explosive life of massive binaries
Renzo, M.; Zapartas, E.
Massive stars are born predominantly as members of binary (or higher multiplicity) systems, and the presence of a companion can significantly alter their life and final fate. Therefore, any observed sample of massive stars or associated transients is likely to be significantly influenced by the effects of binarity. Here, we focus on the relationsh…
Detecting Exoplanets Using Eclipsing Binaries as Natural Starshades
Zabludoff, Ann I.; Guyon, Olivier; Bellotti, Stefano +2 more
We investigate directly imaging exoplanets around eclipsing binaries using the eclipse as a natural tool for dimming the binary and thus increasing the planet to star brightness contrast. At eclipse, the binary becomes pointlike, making coronagraphy possible. We select binaries where the planet-star contrast would be boosted by >10× during ecli…
ACRONYM IV: Three New, Young, Low-mass Spectroscopic Binaries
Kraus, Adam L.; Shkolnik, Evgenya L.; Bowler, Brendan P. +4 more
As part of our search for new low-mass members of nearby young moving groups (YMGs), we discovered three low-mass, spectroscopic binaries, two of which are not kinematically associated with any known YMG. Using high-resolution optical spectroscopy, we measure the component and systemic radial velocities of the systems, as well as their lithium abs…
Re-Reduction of the Old Photographic Observations of Interamnia (704) Based on Gaia DR2 Reference Catalogue
Protsyuk, Yu. I.; Maigurova, N. V.
A new astrometric reduction of old photographic astroplates benefiting from integration of modern technologies such as the high precision digitizing machines and the high precision Gaia DR2 catalogue could be useful to study the orbital motion of Solar system minor bodies. Based on the newly released Gaia DR2 star catalogue, the scans of the photo…
Multiple populations of Hβ emission line stars in the Large Magellanic Cloud cluster NGC 1971
Piatti, Andrés E.
We revisited the young Large Magellanic Cloud star cluster NGC 1971 with the aim of providing additional clues to our understanding of its observed extended main-sequence turnoff (eMSTO), a feature commonly seen in young star clusters that has recently been argued to be caused by a real age spread similar to the cluster age (∼160 Myr). We combined…
Vertical controlled landing on 67P / Churyumov-Gerasimenko
Probst, A.; San Martín, A.; Zimmer, A. +2 more
With the increasing interest of small body science due to its important role in the puzzle of the solar system formation, missions to small bodies are studied and developed in preparation for future exploration. Together with the operational experience gained and the general rapid technology development, landers and surface mobility elements enabl…
Global Parameters of the Newly-discovered W UMa Stars WISEJ004327.7+722407 and WISEJ234557.8+510456
Ibryamov, S.; Kjurkchieva, D.
Photometric observations in g' and i' bands of the newly-discovered W UMa stars WISEJ004327.7+722407 and WISEJ234557.8+510456 are presented. The two targets are with shallow-contact configurations and their components are of G--K spectral type. We found that WISEJ004327.7+722407 is of A subtype while WISEJ234557.8+510456 is of W subtype. The diffe…