Search Publications
Asymptotic Giant Branch Stars in the Nearby Dwarf Galaxy Leo P
van Loon, J. Th.; Zijlstra, A. A.; Skillman, E. D. +7 more
We have conducted a highly sensitive census of the evolved-star population in the metal-poor dwarf galaxy Leo P and detected four asymptotic giant branch (AGB) star candidates. Leo P is one of the best examples of a nearby analog of high-redshift galaxies because of its primitive metal content (2% of the solar value), proximity, and isolated natur…
High-velocity Bullets from V Hydrae, an Asymptotic Giant Branch Star in Transition: Ejection History and Spatio-kinematic Modeling
Sahai, R.; Morris, M. R.; Scibelli, S.
The carbon star V Hydrae (V Hya) provides new insight into the nature of the launching mechanism of jet-like outflows that are believed to be the cause of the poorly understood transition phase of asymptotic giant branch stars into aspherical planetary nebulae. V Hya has been shown to periodically eject collimated gas blobs at high velocities (“bu…
Ground-based detection of a cloud of methanol from Enceladus: when is a biomarker not a biomarker?
Clements, D. L.; Drabek-Maunder, E.; Greaves, J. +2 more
aturn's moon Enceladus has vents emerging from a sub-surface ocean, offering unique probes into the liquid environment. These vents drain into the larger neutral torus in orbit around Saturn. We present a methanol (CH3OH) detection observed with IRAM 30-m from 2008 along the line-of-sight through Saturn's E-ring. Additionally, we also p…
Three-dimensional analysis of spatial resolution of MIRO/Rosetta measurements at 67P/Churyumov-Gersimenko
Shi, X.; Hartogh, P.; Rezac, L. +3 more
Context. The MIRO instrument's remote sensing capability is integral to constraining water density, temperature, and velocity fields in the coma of 67P/Churyumov-Gersimenko.
Aims: Our aim is to quantify how much water density originates from the facets of the shape model within the field of view of MIRO versus the water contribution from all …
Investigating Early-type Galaxy Evolution with a Multiwavelength Approach. III. Insights from SPH Simulations with Chemophotometric Implementation
Mazzei, Paola; Rampazzo, Roberto; Marino, Antonietta +3 more
We are exploring galaxy evolution in low-density environments exploiting smooth particle hydrodynamic simulations, including chemophotometric implementation. From a large grid of simulations of galaxy encounters and mergers starting from triaxial halos of gas and dark matter, we single out the simulations matching the global properties of our targ…
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…