Zobrazeno 1 - 10
of 1 660
pro vyhledávání: '"Pandey, P. C."'
Autor:
Bharathan, Athira M., Stalin, C. S., Sahayanathan, S., Wani, Kiran, Mandal, Amit Kumar, Chatterjee, Rwitika, Joshi, Santosh, Pandey, Jeewan C, Mathew, Blesson, Agrawal, Vivek K.
We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The X-ray polarimetric observations were carried out using {\it Imaging X-ray Polarimetry Explorer} ({\it IXPE}) on 06 Decem
Externí odkaz:
http://arxiv.org/abs/2409.16745
Autor:
Rawat, Nikita, De Martino, Domitilla, Mukai, Koji, Falanga, Maurizio, Masetti, Nicola, Pandey, Jeewan C.
We present our findings from the first long X-ray observation of the hard X-ray source Swift J0826.2-7033 with XMM-Newton, which has shown characteristics of magnetic accretion. The system appears to have a long orbital period (~7.8 h) accompanied by
Externí odkaz:
http://arxiv.org/abs/2409.15429
Publikováno v:
ApJ Letters 2024
This paper presents results from Kepler photometric light curves and high-resolution spectroscopic study of a super Li-rich giant KIC11087027. Using the light curve analysis, we measured the star's rotational period P$_{\rm rot}$=30.4$\pm$0.1~days, w
Externí odkaz:
http://arxiv.org/abs/2408.05931
Autor:
Raj, A., Bisht, M. S., Walter, F. M., Pandey, R., Woodward, C. E., Harker, D. E., Bisht, D., Singh, H. P., Agarwal, A., Pandey, J. C., Joshi, A., Belwal, K., Buil, Christian
V5579 Sgr was a fast nova discovered in 2008 April 18.784 UT. We present the optical spectroscopic observations of the nova observed from the Castanet Tolosan, SMARTS and CTIO observatories spanning over 2008 April 23 to 2015 May 11. The spectra are
Externí odkaz:
http://arxiv.org/abs/2408.01924
Publikováno v:
Bulletin de la Societe Royale des Sciences de Liege, 2024, Volume 93, No 2, 478-490
The high luminosity of massive, early-type stars drives strong stellar winds through line scattering of the stars continuum radiation. Their momenta contribute substantially to the dynamics and energetics of the ambient interstellar medium in galaxie
Externí odkaz:
http://arxiv.org/abs/2406.15094
Massive star winds are known to be responsible for X-ray emission arising from wind plasma heated by the strong shocks up to the temperature of 10$^6$--10$^7$ K in case of colliding wind binaries. We have investigated thermal and non-thermal X-ray em
Externí odkaz:
http://arxiv.org/abs/2404.02363
Autor:
Singh, Sadhana, Pandey, Jeewan C., Hoang, Thiem, Panwar, Neelam, Medhi, Biman J., Joshi, Vishal, Ganesh, Shashikiran
Using starlight polarization, we present the properties of foreground dust towards cluster NGC 7380 embedded in H{\sc ii} region Sh 2-142. Observations of starlight polarization are carried out in four filters using an imaging polarimeter equipped wi
Externí odkaz:
http://arxiv.org/abs/2403.20043
Autor:
Singh, Gurpreet, Pandey, Jeewan C.
Using long-term X-ray observations, we present the short-term and long-term X-ray variability analysis of the ultra-fast rotating active star AB Dor. Flaring events are common in X-ray observations of AB Dor and occupy a substantial portion of the to
Externí odkaz:
http://arxiv.org/abs/2402.19083
Autor:
Bandyopadhyay, Avrajit, Beers, Timothy C, Ezzeddine, Rana, Sivarani, Thirupathi, Nayak, Prasanta K, Pandey, Jeewan C, Saraf, Pallavi, Susmitha, Antony
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 529, Issue 3, pp.2191-2207, 2024
We present a comprehensive analysis of the detailed chemical abundances for a sample of 11 metal-poor, very metal-poor and extremely metal-poor stars ([Fe/H] = -1.65 to [Fe/H] = -3.0) as part of the HESP-GOMPA (Galactic survey Of Metal Poor stArs) su
Externí odkaz:
http://arxiv.org/abs/2402.17250
We present an X-ray and UV investigation of five X-ray flares detected on two active systems, CC Eri and AB Dor, using the AstroSat observatory. The peak X-ray luminosities of the flares in the 0.3$-$7.0 keV band are found to be within 10$^{31-33}$ e
Externí odkaz:
http://arxiv.org/abs/2401.00117