448 citations · 1.3k across the 32 of their papers we have counts for
8 papers · 1 filter
Quiescence of an Outburst of a Low-Mass Young Stellar Object: LDN1415-IRS
Koshvendra Singh, Devendra K. Ojha, Joe P. Ninan +5
LDN1415-IRS, a low-mass young stellar object (YSO) went into an outburst between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb. LDN1415-Neb was found to have bright…
Spectroscopy of 9 eruptive young variables using TANSPEC
Arpan Ghosh, Saurabh Sharma, Joe P. Ninan +8
In recent times, 3.6m Devasthal Optical Telescope (DOT) has installed an optical to near infra-red spectrograph, TANSPEC, which provides spectral coverage from 0.55-2.5 microns. Us…
-band Temperature and Metallicity Indicators for Cool Giants: Empirical Relations in Bayesian Framework
Supriyo Ghosh, J. P. Ninan, D. K. Ojha
We explored here the near-infrared -band atmospheric window aiming to provide quantitative diagnostic tools for deriving stellar parameters, for instance, effective temperature…
Spectroscopic and photometric monitoring of a poorly known high-luminous OH/IR star: IRAS 18278+0931
Supriyo Ghosh, Soumen Mondal, Ramkrishna Das +1
We present the time-dependent properties of a poorly known OH/IR star IRAS 18278+0931 (hereafter, IRAS 18+09) towards the Ophiuchus constellation. We have carried out long-term…
New Temperature and Metallicity Scale of Cool Giants from K-band Spectra
Supriyo Ghosh, D. K. Ojha, J. P. Ninan
We present here quantitative diagnostic tools for cool giants that employ low-resolution near-infrared spectroscopy in the -band for stellar population studies. In this study, a…
Understanding Physical Properties of Young M-dwarfs: NIR spectroscopic studies
Dhrimadri Khata, Soumen Mondal, Ramkrishna Das +2
We present here medium resolution (λ/Δλ\sim1200) H- and K-band spectra of M type dwarf stars covering the wavelength range 1.50 - 1.80 μm and 1.95 - 2.45 μm. The sample includes 53…
Spectral Calibration of KM Giants from medium resolution near-infrared HK-band spectra
Supriyo Ghosh, Soumen Mondal, Ramkrishna Das +1
We present here new medium resolution spectra ( 1200) of KM giants covering wavelength range 1.501.80 and 1.952.45 m. The sample includes 72 K0M8 giants…
Phase-dependent photometric and spectroscopic characterization of the MASTER-Net Optical Transient J212444.87+321738.3: an oxygen rich Mira
Supriyo Ghosh, Soumen Mondal, Ramkrishna Das +4
We describe the time-dependent properties of a new spectroscopically confirmed Mira variable, which was discovered in 2013 as MASTER-Net Optical Transient (OT) J212444.87+321738.3…