Zobrazeno 1 - 10
of 397
pro vyhledávání: '"Joshi, Santosh"'
We present one high-resolution and a time series of 561 low-resolution follow-up spectroscopic observations of SZ Lyn. It is a high-amplitude Delta Scuti-type pulsating star in a binary system. The photometric observations reveal the existence of rad
Externí odkaz:
http://arxiv.org/abs/2405.12817
Autor:
Bhattacharyya, Suman, Mathew, Blesson, Banerjee, Gourav, G, Sindhu, Muneer, S., Kumar, S. Pramod, Joshi, Santosh
In our previous study (Bhattacharyya et al., 2022), HD~54786, the optical counterpart of the MAXI J0709-159 system, was identified to be an evolved star, departing from the main sequence, based on comparisons with non-X-ray binary systems. In this pa
Externí odkaz:
http://arxiv.org/abs/2404.13303
Autor:
Banerjee, Gourav, Mathew, Blesson, Bhattacharyya, Suman, Devaraj, Ashish, Kartha, Sreeja S, Joshi, Santosh
In a recent study, Banerjee et al. (2021) produced an atlas of all major emission lines found in a large sample of 115 Galactic field Be stars using the 2-m Himalayan Chandra Telescope (HCT) facility located at Ladakh, India. This paper presents our
Externí odkaz:
http://arxiv.org/abs/2404.10339
HD 12098 is an roAp star pulsating in the most distorted dipole mode yet observed in this class of star. Using TESS Sector 58 observations we show that there are photometric spots at both the magnetic poles of this star. It pulsates obliquely primari
Externí odkaz:
http://arxiv.org/abs/2402.06314
Publikováno v:
2024, Bulletin de la Societe Royale des Sciences de Liege, 94
In this paper, we report the detection of amplitude modulation in a delta Scuti star HD118660. We found that the p-mode frequency at 24.3837 c/d varies periodically in amplitude with frequency 0.0558 c/d. However, all other modes are stable in both a
Externí odkaz:
http://arxiv.org/abs/2402.03403
Autor:
Parida, Sugyan, Yadav, Abhay Pratap, Kraus, Michaela, Glatzel, Wolfgang, Joshi, Yogesh Chandra, Joshi, Santosh
B[e] type stars are characterised by strong emission lines, photometric $\&$ spectroscopic variabilities and unsteady mass-loss rates. MWC 137 is a galactic B[e] type star situated in the constellation Orion. Recent photometric observation of MWC 137
Externí odkaz:
http://arxiv.org/abs/2311.12549
Autor:
Uppal, Namita, Ganesh, Shashikiran, Joshi, Santosh, Sarkar, Mrinmoy, Prajapati, Prachi, Dileep, Athul
Dust is a ubiquitous component in our Galaxy. It accounts for only $1\%$ mass of the ISM but still is an essential part of the Galaxy. It affects our view of the Galaxy by obscuring the starlight at shorter wavelengths and re-emitting in longer wavel
Externí odkaz:
http://arxiv.org/abs/2311.09617
The Nainital-Cape Survey was initiated more than two decades ago aiming to search for and study the pulsational variability in two subclasses of chemically peculiar (CP) stars, namely the Ap and Am stars. In this paper, we present the TESS photometry
Externí odkaz:
http://arxiv.org/abs/2309.15879
Luminous blue variables (LBVs) are evolved massive stars close to the Eddington limit, with a distinct spectroscopic and photometric variability having unsteady mass-loss rates. These stars show a considerable change in their surface temperature from
Externí odkaz:
http://arxiv.org/abs/2307.03050
Autor:
Trust, Otto, Mashonkina, Lyudmila, Jurua, Edward, De Cat, Peter, Tsymbal, Vadim, Joshi, Santosh
We report the analysis of high-precision space-based photometric and high-resolution spectroscopic observations of HD 180347. The high-quality light curves from the Transiting Exoplanet Survey Satellite (TESS) under sectors 14, 15, and 26 were used.
Externí odkaz:
http://arxiv.org/abs/2306.14154