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Remarks about the data processing of the Relaxation Probe on the Huygens experiment
Molina-Cuberos, G. J.; Godard, R.
On January 14, 2005, the Relaxation Probe (RP) on the Huygens experiment measured the electrical conductivity in the lower atmosphere of Titan, the largest Saturnian satellite, from 140 km to 40 km of altitude. The Huygens experiment provided a unique opportunity to compare results from the Mutual Impedance Probe (MIP) with the Relaxation Probe (R…
A New Variable in the Field of WD1145+017
Serebryanskiy, A.
Revisit of the CCD archive obtained during long-time monitoring of the white dwarf WD1145+015 at Tien-Shan Observatory revealed a new variable star, identified as Gaia DR2 3796400796427214848. It was inferred that this star is of spectral type G7V-G8V. The amount of photometric data allows performing detailed analysis of this target, revealing its…
Elemental abundances of RGB and red clump stars in the Kepler field
Wang, L.; Zhao, G.; Takeda, Y. +2 more
The helium flash is a key point in the evolution process of stars that have evolved off the main sequence. However, chemical abundance differences in the stellar photosphere before and after this step are poorly investigated, mainly because of the degeneracy of red giant branch (RGB) and red clump stars (RC) in the Hertzsprung-Russell (HR) diagram…
The HH34 Jet/Counterjet System at 1.5 and 4.5µm
Raga, A. C.; Noriega-Crespo, A.; Reipurth, B.
We present a (previously unpublished) 1.5 µm archival HST image of the HH 34 Herbig-Haro jet, in which the northern counterjet is seen at an unprecedented angular resolution of ≈0.1" (this counterjet had only been imaged previously at lower resolution with Spitzer). The jet/counterjet structure observed in this image shows evidence of low-am…
XMM-Newton and Fermi/LAT view on the supernova remnant 3C434.1
Santangelo, A.; Pühlhofer, G.; Sasaki, M. +3 more
We report on XMM-Newton observations of the supernova remnant (SNR) 3C434.1 (G94.0+1.0), the first in X-rays since the ROSAT era. Our analysis confirms the thermal origin of the observed extended X-ray emission, whose morphology appears more complex than previously reported. In particular, part of the shell shows a significantly harder spectrum wh…
New light curve solution of V568 Peg and first determination of its fundamental parameters
Kjurkchieva, Diana; Ibryamov, Sunay
We present V, R_c photometric observations of the short-period W UMa star V568 Peg. They allowed us to improve its period. The light curve solution revealed that V568 Peg is an overcontact binary of A subtype with moderate fill-out factor. Its components are K stars which undergo partial eclipses. The mass ratio was estimated by q-search analysis.…
A Kinematically Cold Structure of Candidate Young OB Stars toward the Anticenter
Casetti-Dinescu, Dana I.; Girard, Terrence M.
We combine Galaxy Evolution Explorer and Gaia DR2 catalogs to track star formation in the outskirts of our Galaxy. Using photometry, proper motions, and parallaxes we identify a structure of ∼300 OB-type candidates located between 12 and 15 kpc from the Galactic center that are kinematically cold. The structure is located between l = 120° and 200°…
Editor's note
Schartel, Norbert
Transient Dimming of the Bright Fe XIV Emission Region in the Solar Corona of the 21 August 2017 Total Solar Eclipse
Liebenberg, D. H.
During the 21 August 2017 total solar eclipse the corona was observed through a narrowband filter centered at the Fe XIV green emission line at a cadence of 30 frames/s. A bright region on the east limb was observed to dim during the 2 m 35 s totality. Details of the temporal behavior of this region are reported. The likely association of the dimm…
Data-Driven Pixelation with Voronoi Tessellation
Lam, Marco C.; McWhirter, Paul R.
In modern Astrophysics, Voronoi Tessellation is a rarely used as a pixelation scheme. While it exists, it is almost exclusively used in signal enhancements, clustering analysis, and simulations. In observational Astronomy, with Gaia, ZTF, DES, etc. data becoming available, this branch of science is becoming more and more data-driven. HEALPix offer…