Journal of Astrophysics and Astronomy
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Suzaku observation of the eclipsing high mass X-ray binary pulsar XTE J1855-026
Journal of Astrophysics and Astronomy - Tập 39 - Trang 1-7 - 2018
We report results from analysis performed on an eclipsing supergiant high mass X-ray binary pulsar XTE J1855-026 observed with the X-ray Imaging Spectrometer (XIS) on-board Suzaku Observatory in April 2015. Suzaku observed this source for a total effective exposure of
$$\sim $$
......
Transition between general relativity and quantum gravity using quark and strange quark matter with some kinematical test
Journal of Astrophysics and Astronomy - Tập 39 - Trang 1-8 - 2018
Contemporary piece of writing devotes to the investigation of plane symmetric cosmological model with quark and strange quark matter in the deformations of the Einstein’s theory of General Relativity (GR). At small or large scales (ultraviolet or infrared gravity), deformations of the Einstein’s theory could provide a better handling of cosmic acceleration without magnetism (along with singulariti......
Special calibrations during AstroSat mission operations towards meeting observation and pointing requirements
Journal of Astrophysics and Astronomy - Tập 42 Số 2 - 2021
Possibilities of identifying members from Milky Way satellite galaxies using unsupervised machine learning algorithms
Journal of Astrophysics and Astronomy - Tập 45 - Trang 1-20 - 2024
A detailed study of stellar populations in Milky Way (MW) satellite galaxies remains an observational challenge due to their faintness and fewer spectroscopically confirmed member stars. We use unsupervised machine learning methods to identify new members for nine nearby MW satellite galaxies using Gaia data release-3 (Gaia DR3) astrometry, the Dark Energy Survey (DES) and the DECam Local Volume E......
Yields of Nucleosynthesis from massive and intermediate mass stars and constraints on their final evolution
Journal of Astrophysics and Astronomy - - 1985
Supernovae and the Ap phenomenon
Journal of Astrophysics and Astronomy - Tập 1 - Trang 155-164 - 1980
We put forward evidence that relates the phenomenon of the chemically peculiar stars of the upper main sequence to Supernovae explosions in young clusters. In the Upper Scorpius region we find that a supernova shell has interacted with dense clouds and that the peculiar stars lie close to or along the edges of interaction. We argue that the stars at or near the cloud faces are capable of acquiring......
A search for OB stars in supernova remnants
Journal of Astrophysics and Astronomy - Tập 1 - Trang 67-70 - 1980
A massive binary, in which the primary becomes a supernova, should leave a luminous secondary near the centre of its remnant. Contrary to expectation no statistically significant excess of OB stars is, however, found near the centres of optically visible galactic supernova remnants.
Changed Relation between Solar 10.7-cm Radio Flux and some Activity Indices which describe the Radiation at Different Altitudes of Atmosphere during Cycles 21–23
Journal of Astrophysics and Astronomy - Tập 35 - Trang 1-15 - 2014
The correlation coefficients of the linear regression of six solar indices versus 10.7 cm radio flux F
10.7 were analysed in solar cycles 21, 22 and 23. We also analysed the interconnection between these indices and F
10.7 with help of approximation by polynomials of second order. The indices we have studied in this paper are: the relative sunspot numbers – SSN, 530......
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