Search Publications
Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
Palazzi, E.; Minniti, D.; Masetti, N. +15 more
The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the BAT instrument onboard the Neil Gehrels Swift Observatory (hereafter Swift) is unknown because of the lack of an identified longer-wavelength counterpart. Without such follow-up, an X-ray catalogue is of limited astrophysical value: we therefore emba…
Metallicity and absolute magnitude calibrations for F-G type main-sequence stars in the Gaia era
Bilir, S.; Ak, T.; Yontan, T. +3 more
In this study, photometric metallicity and absolute magnitude calibrations were derived using F-G spectral type main-sequence stars in the Solar neighbourhood with precise spectroscopic, photometric and Gaia astrometric data for UBV photometry. The sample consists of 504 main-sequence stars covering the temperature, surface gravity and colour inde…
Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)
Brosch, Noah; Mathew, Joice; Sreejith, A. G. +14 more
The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus—the original Indian entry to the Google Lunar X-Prize. Observations from the Moon provide a unique opportunity of a stable platform with an unobstructed vi…
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 (