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GK Car and GZ Nor: two low-luminous, depleted RV Tauri stars
Gezer, I.; Van Winckel, H.; Kamath, D. +1 more
We performed a photometric and spectroscopic analysis of two RV Tauri stars: GK Car and GZ Nor. Both objects are surrounded by hot circumstellar dust. Their pulsation periods, derived from ASAS (All Sky Automated Survey) photometric time-series, have been used to derive their luminosities and distances via the period-luminosity-distance (PLC) rela…
Candidates for non-pulsating stars located in the Cepheid instability strip in the Large Magellanic Cloud based on Strömgren photometry
Soszyński, I.; Smolec, R.; Udalski, A. +14 more
We present candidates for non-pulsating stars lying in the classical Cepheid instability strip based on the Optical Gravitational Lensing Experiment (OGLE) photometric maps combined with Strömgren photometry obtained with the 4.1-m Southern Astrophysical Research (SOAR) telescope, and Gaia Data Release 2 data in four fields in the Large Magellanic…
Influence of collisions on ion dynamics in the inner comae of four comets
Eriksson, A.; Vigren, E.; Galand, M. +2 more
Context. Collisions between cometary neutrals in the inner coma of a comet and cometary ions that have been picked up into the solar wind flow and return to the coma lead to the formation of a broad inner boundary known as a collisionopause. This boundary is produced by a combination of charge transfer and chemical reactions, both of which are imp…
Observations of a Flare-Generated Blast Wave in a Pseudo Coronal Mass Ejection Event
Zimovets, I. V.; Eselevich, M. V.; Eselevich, V. G.
We present an analysis of the event near the east limb, SOL2014-03-06T09:23, in which a pseudo coronal mass ejection (CME) was detected by the Large Angle and Spectrometric Coronagraph (LASCO) C2 instrument and indicated as "Poor Event; Only C2" in the Solar and Heliospheric Observatory (SOHO) LASCO CME Catalog. The analysis was performed based on…
Abnormal Subauroral Ion Drifts (ASAID) and Pi2s During Cross-Tail Current Disruptions Observed by Polar on the Magnetically Quiet Days of October 2003
Horvath, Ildiko; Lovell, Brian C.
In this study we further investigate the development of abnormal subauroral ion drifts/polarization streams (ASAID/ASAPS) during the magnetically quiet days of 9-10 October 2003. Our main aim is to provide direct observational evidence verifying that the Defense Meteorological Satellite Program F15 detected quiet-time ASAID/ASAPS features develope…
Solar irradiance, climatic indicators and climate change - An empirical analysis
Singh, A. K.; Bhargawa, Asheesh
Since the Sun is the main source of energy for our planet therefore even a slight change in its output energy can make a huge difference in the climatic conditions of the terrestrial environment. The rate of energy coming from the Sun (solar irradiance) might affect our climate directly by changing the rate of solar heating of the Earth and the at…
Hazes and clouds in a singular triple vortex in Saturn's atmosphere from HST/WFC3 multispectral imaging
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Irwin, Patrick G. J. +2 more
In this paper we present a study of the vertical haze and cloud structure over a triple vortex in Saturn's atmosphere in the planetographic latitude range 55°N-69°N (del Río-Gaztelurrutia et al., 2018) using HST/WFC3 multispectral imaging. The observations were taken during 29-30 June and 1 July 2015 at ten different filters covering spectral rang…
A Search for Analogs of KIC 8462852 (Boyajian’s Star): A Proof of Concept and the First Candidates
Schmidt, Edward G.
The seemingly normal F dwarf, KIC 8462852 (a.k.a. Boyajian’s Star), has been observed to exhibit two types of behavior unique among known variable stars: infrequent episodes of small brightness dips and a long-term decline in brightness between the dips. No satisfactory mechanism has been found for this behavior, at least in part, because there is…
Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20
Robinson, Andrew; Fischer, Travis C.; Schnorr-Müller, Allan +14 more
We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 × 1.9 kpc2 of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) at a spatial resolution of 250 pc and spectral resolution of 36 km s-1. Strong [O III], Hα, [N II] and [S …
Star Clusters in the Elliptical Galaxy NGC 4589 Hosting a Calcium-rich SN Ib (SN 2005cz)
Lee, Myung Gyoon; Kang, Jisu; Jang, In Sung
NGC 4589, a bright E2 merger-remnant galaxy, hosts the peculiar fast and faint calcium-rich SN Ib SN 2005cz. The progenitor of Ca-rich SNe Ib has been controversial: it could be (1) a young, massive star with 6-12 M ⊙ in a binary system, or (2) an old, low-mass star in a binary system that was kicked out from the galaxy center. Moreover…