Search Publications
Period Changes of Mira Variables in the M16 - M17 Region
Nesci, R.; Tuvikene, T.; Soszynski, I.
We analyzed the light curves of 165 AGB variables, mostly Miras, in the sky area centered between M16 and M17 (l = 16, b = 0), using the OGLE GVS database in the Ic band. Comparison with the published light curves, derived about 50 years earlier by P. Maffei using Kodak I-N photographic plates, allowed us to find no significant period changes in a…
A Stellar Ranging Scheme Based on the Second-order Correlation Measurement
Li, Jian; Xu, Can; Liu, Yinshen +5 more
Stellar ranging is the basis for stellar dynamics research and in-depth research on astrophysics. The parallax method is the most widely used and important basic method for stellar ranging. However, it needs to perform high-precision measurement of the parallax angle and the baseline length together. We aim to propose a new stellar ranging scheme …
Erratum: "Identification of Faint Chandra X-Ray Sources in the Core-collapsed Globular Cluster NGC 6397: Evidence for a Bimodal Cataclysmic Variable Population" (2010, ApJ, 722, 20)
Anderson, Jay; Bogdanov, Slavko; Heinke, Craig O. +6 more
Spectral variability in NGC 1042 ULX1
Rana, Vikram; Ghosh, Tanuman
We report X-ray spectral variability in an ultraluminous X-ray source NGC 1042 ULX1, using archival XMM-Newton and recent NuSTAR observations. In long-term evolution, the source has shown a trend of variation in spectral hardness. The variability in different XMM-Newton observations is prominent above ~1 keV. Cool thermal disc component with a cha…
Machine Learning Enabled Global Mapping of Mg-Spinel Lithology Using Chandrayaan-1 Moon Mineralogy Mapper (M3) Data
Mall, U.; Bhatt, M.; Dhingra, D. +4 more
We present the first results from a machine learning-enabled systematic global mapping of Mg-spinel exposures using M3 data.
Multi-wavelength and Multi-perspective Studies of Coronal Mass Ejections and Their Driven Shocks
Ying, B. L.
Coronal Mass Ejections (CMEs) are one of the most fierce explosion phenomena in the solar atmosphere. CMEs usually release a large amount of energy and eject massive magnetized plasma. CME-driven shocks can further lead to solar energetic particle (SEP) events and affect the safety of spacecraft and astronauts. Therefore, researches on CME initiat…
An investigation of the magnetic activity of HD 134319 based on TESS photometry and ground-based spectroscopy
Gu, Shenghong; Xu, Fukun; Ioannidis, Panogiotis
We present an analysis of the starspot properties and chromospheric activity on HD 134319 using high-precision photometry by Transiting Exoplanet Survey Satellite (TESS) in sectors 14-16 (T1) and 21-23 (T2) and high-resolution spectroscopy by the ELODIE spectrograph on 1.93-m telescope of Observatoire de Haute-Provence (OHP/ELODIE) and the High Re…
Distance determination by magnitude analysis of some open clusters with GAIA era and stellar luminosity function
Elsanhoury, W. H.; Haroon, A. A.; Al-Johani, Amnah S. +1 more
In this work, we carry out by utilizing the distance equation with providing some basic descriptive statistics for both apparent and absolute magnitudes, the distances of some open clusters (i.e., Hyades, Pleiades, IC 2391, Koposov 12, Koposov 43, NGC 1348, NGC 2112, NGC 4337, SAI 24, and SAI 94) with the assumption that all members N are scatteri…
OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions
Udalski, Andrzej; Mróz, Przemek; Skowron, Jan +37 more
We report the discovery of a sub-Jovian-mass planet, OGLE-2014-BLG-0319Lb. The characteristics of this planet will be added into a future extended statistical analysis of the Microlensing Observations in Astrophysics (MOA) collaboration. The planetary anomaly of the light curve is characterized by MOA and OGLE survey observations and results in th…
A billion or more years of possible periglacial/glacial cycling in Protonilus Mensae, Mars
Soare, R. J.; Williams, J. -P.; Hepburn, A. J. +1 more
The long-term cyclicity and temporal succession of glacial-periglacial (or deglacial) periods or epochs are keynotes of Quaternary geology on Earth. Relatively recent work has begun to explore the histories of the mid- to higher-latitudinal terrain of Mars, especially in the northern hemisphere, for evidence of similar cyclicity and succession in …