Zobrazeno 1 - 10
of 3 005
pro vyhledávání: '"Pandey, A. C."'
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
Autor:
Karmakar, Subhajeet, Bandyopadhyay, Avrajit, Weaver, Wm. Bruce, Shedge, Riddhi, Pandey, Jeewan C., Cotton, Daniel V., Perkins, Jean
Late-type stars are the most abundant in the galactic stellar population. These stars, with a similar internal structure to the Sun, are expected to have solar-like atmospheres. Investigating the stellar parameters and chemical abundances on late-typ
Externí odkaz:
http://arxiv.org/abs/2401.00113
We present the analyses of intense X-ray flares detected on the active fast rotator AB Dor using observations from the XMM-Newton. A total of 21 flares are detected, and 13 flares are analysed in detail. The total X-ray energy of these flares is foun
Externí odkaz:
http://arxiv.org/abs/2310.13416