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A GMRT 150 MHz search for variables and transients in Stripe 82
Frail, D. A.; Mooley, K. P.; Intema, H. T. +1 more
We have carried out a dedicated transient survey of 300 deg2 of the SDSS Stripe 82 region using the Giant Metrewave Radio Telescope (GMRT) at 150 MHz. Our multi-epoch observations, together with the TGSS survey, allow us to probe variability and transient activity on four different time-scales, beginning with 4 h and up to 4 yr. Data ca…
On the Fast Solar Wind Heating and Acceleration Processes: A Statistical Study Based on the UVCS Survey Data
Telloni, Daniele; Antonucci, Ester; Giordano, Silvio
The UltraViolet Coronagraph Spectrometer (UVCS) on board the SOlar and Heliospheric Observatory has almost continuously observed, throughout the whole solar cycle 23, the UV solar corona. This work addresses the first-ever statistical analysis of the daily UVCS observations, performed in the O VI channel, of the northern polar coronal hole, betwee…
Photometry of K2 Campaign 9 bulge data
Udalski, A.; Poleski, R.; Gould, A. +4 more
In its Campaign 9, K2 observed dense regions toward the Galactic bulge in order to constrain the microlensing parallaxes and probe for free-floating planets. Photometric reduction of the K2 bulge data poses a significant challenge due to a combination of the very high stellar density, large pixels of the Kepler camera, and the pointing drift of th…
2PBC J0658.0-1746: a hard X-ray eclipsing polar in the orbital period gap
Mukai, K.; de Martino, D.; Masetti, N. +2 more
The hard X-ray source 2PBC J0658.0-1746 was proposed as an eclipsing magnetic cataclysmic variable of the polar type, based on optical follow-ups. We present the first spectral and timing analysis at X-ray energies with XMM-Newton, complemented with archival X-ray, optical, infrared (IR) photometry, and spectroscopy. The X-ray emission shows brigh…
A VLT/FLAMES survey for massive binaries in Westerlund 1. V. The X-ray selected blue stragglers Wd1-27 and -30a
Negueruela, I.; Najarro, F.; Clark, J. S. +3 more
Context. Recent observational studies indicate that a large number of OB stars are found within binary systems which may be expected to interact during their lifetimes. Significant mass transfer or indeed merger of both components is expected to modify evolutionary pathways, facilitating the production of exceptionally massive stars which will pre…
YZ Phoenicis: a very short period K-type contact binary with variation of the O'Connell effect and orbital period change
Li, Lin-Jia; Qian, Sheng-Bang; Zhang, Jia +7 more
YZ Phe is a very short-period contact binary (Sp. = K2 V) with an orbital period of 0.2347 d near the short period limit (0.22 d). We present the complete light curves which photometric data were obtained from the 60 cm telescope of PROMPT-8 at CTIO in Chile during 2016 June to October and 2017 August. The photometric solutions were determined by …
Full inversion of solar relativistic electron events measured by the Helios spacecraft
Lario, D.; Heber, B.; Aran, A. +2 more
Context. The Parker Solar Probe and the incoming Solar Orbiter mission will provide measurements of solar energetic particle (SEP) events at close heliocentric distances from the Sun. Up to present, the largest data set of SEP events in the inner heliosphere are the observations by the two Helios spacecraft.
Aims: We re-visit a sample of 15 s…
Large Molecular Gas Reservoirs in Star-forming Cluster Galaxies
Mroczkowski, Tony; De Breuck, Carlos; Stroe, Andra +2 more
We present CO (2-1) observations of 72 galaxies in the nearby, disturbed Antlia Cluster with the Atacama Pathfinder Experiment telescope. The galaxies in our sample are selected to span a wide range of stellar masses (108 M ⊙ ≲ M ⋆ ≲ 1010 M ⊙) and star formation rates (0.0005 M ⊙ yr…
The peculiar chemistry of the inner ejecta of Eta Carina
Bordiu, Cristobal; Rizzo, J. Ricardo
We investigated continuum and molecular line emission of four species (CO, HCN, H13CN, and HCO+) at 0.8 mm in the inner region around η Car, using ALMA archival observations at a resolution better than 0.2 arcsec. We report the discovery of an asymmetric extended structure north-west of the star, independent from the continuu…
High-resolution spectroscopic study of dwarf stars in the northern sky. Na to Zn abundances in two fields with radii of 20 degrees
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +6 more
Context. New space missions, such as NASA TESS or ESA PLATO, will focus on bright stars, which have been largely ignored by modern large surveys, especially in the northern sky. Spectroscopic information is of paramount importance in characterising the stars and analysing planets possibly orbiting them, and in studying the Galactic disc evolution.…