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Quantitative analysis of isolated boulder fields on comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +37 more
Aims: We provide a detailed quantitative analysis of isolated boulder fields situated in three different regions of comet 67P/Churyumov-Gerasimenko: Imhotep, Hapi, and Hatmehit. This is done to supply a useful method for analyzing the morphology of the boulders and to characterize the regions themselves.
Methods: We used OSIRIS Narrow An…
Chemical evolution of HC3N in dense molecular clouds
Wang, Jun-Jie; Xu, Jin-Long; Yu, Naiping
We investigated the chemical evolution of HC3N in six dense molecular clouds, using archival available data from the Herschel infrared Galactic Plane Survey (Hi-GAL) and the Millimeter Astronomy Legacy Team Survey at 90 GHz (MALT90). Radio sky surveys of the Multi-Array Galactic Plane Imaging Survey (MAGPIS) and the Sydney University Mo…
CCD Photometry, Light Curve Deconvolution, Period Analysis, Kinematics, and Evolutionary Status of the HADS Variable V460 Andromedae
Alton, K. B.; Stepien, K.
Multi-color (BVIc) CCD-derived photometric data were acquired from V460 And, an intrinsic variable classically defined as a High Amplitude delta Scuti (HADS) type system. Deconvolution of precise time-series light curve data was accomplished using discrete Fourier transformation and revealed a fundamental mode (f0) of oscillation at 13.336 d-1 alo…
Multispacecraft Study of the Interaction Between an Interplanetary Shock and a Solar Wind Flux Rope
Burgess, D.; Blanco-Cano, X.; Kajdič, P. +1 more
Interplanetary (IP) shocks are driven in the heliosphere by fast coronal ejecta, they can accelerate particles and are associated with solar energetic particle and energetic storm particle events. IP shocks can interact with structures in the solar wind and with magnetospheres. We show how the properties of an IP shock change when it interacts wit…
New variable stars towards the Galactic Bulge - I. The bright regime
Rejkuba, M.; Anderson, J.; Zoccali, M. +8 more
We report the detection of 3714 variable stars towards the Galactic bulge, including 2521 previously uncatalogued variables, using time-series photometry extracted from data obtained with the VIMOS imager at the Very Large Telescope. Observations of the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS) field in the Galactic Bulge were…
The K2 Light Curves and Stunted Outbursts of AC Cnc
Schlegel, E. M.; Honeycutt, R. K.
We describe two observations of the nova-like cataclysmic variable AC Cnc obtained with Kepler during its revamped second mission (K2). Using the K2 1 minute cadence mode, the data were obtained during campaigns 5 and 18. Campaign 5 (C05) lasted from ∼2015 April 27 to ∼2015 July 10, a total of 74.8 days, and yielded ∼106,000 measurements. Campaign…
An automated approach for photometer and dust mass calculation of the Crab nebula
Sauvage, Marc; Nehmé, Cyrine; Kassounian, Sarkis
Ample evidence exists regarding supernovae being a major contributor to interstellar dust. In this work, the deepest far-infrared observations of the Crab Nebula are used to revisit the estimation of the dust mass present in this supernova remnant. Images in filters between 70 and 500 µ m taken by the PACS and SPIRE instruments on-board of t…
A Long-term Photometric Variability and Spectroscopic Study of Luminous Blue Variable AF And in M31
Joshi, Yogesh C.; Misra, Kuntal; Gangopadhyay, Anjasha +2 more
We present a photometric and spectroscopic analysis of the Hubble-Sandage variable star AF And in M31. The data have been taken under the Nainital Microlensing Survey during 1998-2002, and follow-up observations were carried out until 2011. During this period, photometric observations in Cousins R and I bands were obtained for 169 nights spanning …
NuSTAR and XMM-Newton observations of SXP 59 during its 2017 giant outburst
Weng, Shan-Shan; Ge, Ming-Yu; Zhao, Hai-Hui
The Be X-ray pulsar (BeXRP) SXP 59 underwent a giant outburst in 2017 with a peak X-ray luminosity of 1.1 × 1038 erg s-1. We report on the X-ray behaviour of SXP 59 with the XMM-Newton and NuSTAR observations collected at the outburst peak, decay, and the low luminosity states. The pulse profiles are energy dependent, the pul…
The Circumstellar Envelope of the Semiregular Variable Star V CVn
Lamzin, S. A.; Rastorguev, A. S.; Safonov, B. S. +1 more
V CVn is a red semiregular variable star with an amplitude of its V-band brightness variations of ≈2 m . An unusually high amplitude of its polarization variability, up to 6%, a noticeable inverse correlation between polarization and total flux, and relative constancy of the angle of polarization distinguish this star from other semireg…