Search Publications
A catalogue of 108 extended planetary nebulae observed by GALEX
Pradhan, Ananta C.; Panda, Swayamtrupta; Ojha, Devendra K. +2 more
We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of 108 extended PNe with sizes greater than
Cosmic biology in perspective
Wickramasinghe, N. C.; Lattanzio, John C.; Tout, Christopher A. +2 more
A series of astronomical observations obtained over the period 1986 to 2018 supports the idea that life is a cosmic rather than a purely terrestrial or planetary phenomenon. These include (1) the detection of biologically relevant molecules in interstellar clouds and in comets, (2) mid-infrared spectra of interstellar grains and the dust from come…
A search for evolutionary changes in the pulsation period of the classical Cepheid V609 Cygni
Dambis, A. K.; Berdnikov, L. N.; Pastukhova, E. N.
A total of 820 magnitude estimates were made for the long-period classical Cepheid V609 Cyg (
Ion escape from the upper ionosphere of Titan triggered by the solar wind
Lazar, M.; Moslem, W. M.; El-Labany, S. K. +3 more
The observed escape of ions from the ionosphere of Titan suggests a potential role of the solar wind in the interaction with the upper atmospheric layers. We investigate such a plausible scenario using a hydrodynamic fluid approach for the plasma expansion in the upper ionosphere of Titan, combining (Maxwellian) electrons and three different speci…
Study of eclipsing binary and multiple systems in OB associations V: MQ Cen in Crux OB1
Bakış, Volkan; Bilir, Selçuk; Nitschelm, Christian +6 more
The early-type massive binary MQ Cen (
AU Pegasi revisited: period evolution and orbital elements of a peculiar Type II Cepheid
Szabados, László; Csörnyei, Géza
New analysis on the period changes of Type II Cepheid AU Peg is presented. The available recent photometric measurements were collected and analysed with various methods. The period has been found to be constant for certain time intervals, although increasing in overall, in contrast with the previous expectations, which suggested the period change…
Gould Belt members in X-ray RAVE: cross-matching RAVE stars with 3XMM point sources
Özkan, M. T.; Plevne, O.; Coşkunoğlu, B.
In this paper the results of matching the RAdial Velocity Experiment (RAVE), a spectroscopic Southern hemisphere survey (
The puzzling high velocity G5 supergiant star HD 179821: new insight from Gaia DR2 data
Jasniewicz, G.; Parthasarathy, M.; Thěvenin, F.
HD 179821 is classified as G5 Ia star. From the IRAS colors and spectral energy distributions it was classified as a post-AGB star. But some studies classify it as a massive (30 to
Seasonal change of CH4/H2 ratio in the atmosphere of Uranus
Tu, Cui; Wang, Cong; Hu, Xiong
Uranus is mainly composed of elements heavier than hydrogen and helium, such as C, S, even though very little information about these elements has been detected. Methane is one of the most important component of the atmosphere of Uranus. Analysis of the full-disk spectra of Uranus, as observed by the Xinglong 2.16m telescope with BFOSC (Beijing-Fa…
Search for variable stars in the northern sky: analysis of photometric time series for 3598 stars
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +6 more
As extensive ground-based observations and characterisation of different variable stars are of the utmost importance in preparing optimal input catalogues for space missions, our aim was to search for new variable stars in selected fields of the northern sky. We obtained 24 470 CCD images and analysed photometric time series of stars using the DAO…