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Fine Structures of the Inner Solar Corona and the Associated Magnetic Topology
Stenborg, Guillermo; Ko, Yuan-Kuen; Lionello, Roberto +3 more
We present the fine structure of the inner solar corona between 1.65 and 3.0 solar radii as revealed by the STEREO-A COR1 white-light coronagraph from 2008 June 20 to July 31. The COR1 imaging data were wavelet processed to enhance the intensity contrast of coronal features. The constructed limb synoptic maps at a range of altitudes show the evolu…
The Galaxy structure across the Vela Gum
Pera, M. S.; Vázquez, R. A.; Giorgi, E. E. +3 more
We present first and preliminary results of a study on the open cluster population seen against the Gum Nebula. This is a very large and nearby emission gas structure covering from l=240° to l=270° and from b=+8° to b=-15°, approximately. Taking advantage of the impressive precision and depth (G≈ 20) of data provided by the Gaia mission (EDR3) and…
The gMOSS: the galaxy survey and galaxy populations of the large homogeneous field
Movsessian, T. A.; Dodonov, S. N.; Kotov, S. S. +1 more
We present the gMOSS (Galaxies of Medium-band One-meter Schmidt telescope Survey) catalogue of ~19 000 galaxies in 20 filters (4 broad-band SDSS and 16 medium-band filters). We observed 2.386 deg2 on the central part of the HS47.5-22 field with the 1-m Schmidt telescope of the Byurakan Astrophysical Observatory. The gMOSS is a complete …
The SPHERE view of multiple star formation
Gratton, Raffaele; Bonavita, Mariangela; Marzari, Francesco +1 more
While a large fraction of the stars are in multiple systems, our understanding of the processes leading to the formation of these systems is still inadequate. Given the large theoretical uncertainties, observation plays a basic role. Here we discuss the contribution of high contrast imaging, and more specifically of the SPHERE instrument at the ES…
Stellar Magnetic Activity Measure Based on IUE Mg II h+k Emission Lines of Main-Sequence G Stars
Choi, Hwajin; Yi, Yu; Kim, Dowoon
Stellar magnetic activity is important for formulating the evolution of the star. To represent the stellar magnetic activity, the S index is defined using the Ca II H+K flux measure from the Mount Wilson Observatory. Mg II lines are generated in a manner similar to the formation of Ca II lines, which are more sensitive to weak chromospheric activi…
HD 183986: A High-contrast SB2 System with a Pulsating Component
Gajdoš, Pavol; Vaňko, Martin; Pribulla, Theodor +7 more
There is a small group of peculiar early-type stars on the main sequence that show different rotation velocities from different spectral lines. This inconsistency might be due to the binary nature of these objects. We aim to verify this hypothesis by a more detailed spectroscopic and photometric investigation of one such object: HD 183986. We obta…
Lack of evidence for paleolakes in the Aeolis Dorsa region, Mars; a mapping investigation
Burr, D. M.; Peel, S. E.
The discovery of impact crater paleolakes, like the discoveries of ancient fluvial valleys, has been instrumental in our developing understanding of the history of water on Mars. Numerous and varied inverted paleo-fluvial deposits have been found within the westernmost lobes (Aeolis and Zephyria Plana) of the Medusae Fossae Formation, ∼800 km east…
A study of the characteristic properties of SEP events observed by SOHO ERNE during solar cycle 24
Biji, M. S.; Prince, P. R.
Properties and association of Solar Energetic Particle (SEP) events with their solar sources during the 24th solar cycle were examined. SEPs observed by SOHO ERNE were used. SEP properties include solar release time, peak proton flux and total fluence in different energy channels. Solar release times of SEP events were found out using Velocity Dis…
Investigating the Origin of X-Ray Jets: A Case Study of Four Hybrid Morphology MOJAVE Blazars
Baum, Stefi A.; O'Dea, Christopher P.; Marshall, Herman L. +3 more
We carried out Chandra, Hubble Space Telescope (HST), and Very Large Array observations of four MOJAVE blazars that have previously been classified as hybrid (FR I/II) blazars in terms of radio morphology but not total radio power. The motivation of this study is to determine the X-ray emission mechanism in jets, these being different in FR I and …
Makine Öğrenmesi Yöntemiyle Keşfedilen Seçilmiş Açık Kümelerin Detaylı Analizi
Ülgen, Eyüp Kaan; Ak, Tansel; Akbulut, Burcu
Bu çaılşmada Gaia uydusunun erken üçüncü veri sürümü (Gaia EDR3) kataloğundaki astrometrik ve fotometrik verilerinden itibaren makine öğrenmesi yöntemiyle keşfedilen ve literatürde detaylı çalışması bulunmayan UPK 51, UPK 350, UPK 579 ve UPK 599 açık kümelerinin Gaia EDR3 ve 2MASS verileri kullanılarak astrometrik ve astrofizik parametreleri tayin…