26 citations · 138 across the 21 of their papers we have counts for
23 papers
A Novel Approach to Identify Unseen Companions: An In-Depth study of GDR3 220_28
T. B. Cysil, Blesson Mathew, B. Shridharan +6
Emission lines in the spectrum and the excess seen in the spectral energy distribution (SED) at infrared (IR) wavelengths serve as crucial indicators of accretion activity and the…
A comprehensive multi-wavelength study of two X-ray emitting Be stars
Hema Anilkumar, Blesson Mathew, Savithri H. Ezhikode +4
We present a multi-wavelength study of two X-ray-emitting Be stars, CXOU J052218.4+332820 (Star 1) and CXOU J052304.2+332846 (Star 2), identified from the LAMOST DR5 Hot emission-l…
A multi-epoch spectral and photometric study to understand the nature of the interesting Be star candidate HD 249179
Suman Bhattacharyya, Blesson Mathew, S Muneer +2
HD 249179, a B5 star with unclear classification as either a classical Be star or a high-mass X-ray binary (HMXB) system, is investigated using the first multi-epoch spectral and p…
Analysis of Forbidden Neon Emission lines in HAeBe Stars using Spitzer IRS spectra
D. Akhila, Blesson Mathew, S. Nidhi +7
We analyzed high-resolution mid-infrared spectra of 78 well-known Herbig Ae/Be (HAeBe) stars using Spitzer InfraRed Spectrograph data, focusing on the detection of [Ne {\sc II}] an…
Spectroscopic study of late-type emission-line stars using the data from LAMOST DR6
D. Edwin, Blesson Mathew, B. Shridharan +5
Low-mass emission-line stars belong to various evolutionary stages, from pre-main-sequence young stars to evolved stars. In this work, we present a catalog of late-type (F0 to M9)…
Serendipitous detection of an intense X-ray flare in the weak-line T Tauri star KM Ori with SRG/eROSITA
Savithri H. Ezhikode, Hema Anilkumar, R. Arun +8
Weak-line T Tauri stars (WTTS) exhibit X-ray flares, likely resulting from magnetic reconnection that heats the stellar plasma to very high temperatures. These flares are difficult…
Detection of a new sample of Galactic White Dwarfs in the direction of the Small Magellanic Cloud
A. V. Sidharth, B. Shridharan, Blesson Mathew +7
In this study, we demonstrate the efficacy of the Ultraviolet Imaging Telescope (UVIT) in identifying and characterizing white dwarfs (WDs) within the Milky Way Galaxy. Leveraging…
Insights on the Optical and Infrared Nature of MAXI J0709-159: Implications for High-Mass X-ray Binaries
Suman Bhattacharyya, Blesson Mathew, Gourav Banerjee +4
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 se…
Study of the Balmer decrements for Galactic classical Be stars using the Himalayan Chandra Telescope of India
Gourav Banerjee, Blesson Mathew, Suman Bhattacharyya +3
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 Teles…
Optical Spectroscopy of Classical Be Stars in Old Open Clusters
Madhu Kashyap Jagadeesh, Blesson Mathew, K. T. Paul +4
We performed the optical spectroscopy of 16 classical Be stars in 11 open clusters older than 100 Myr. Ours is the first spectroscopic study of classical Be stars in open clusters…
New insights in the bubble wall of NGC 3324: intertwined sub-structures and a bipolar morphology uncovered by JWST
L. K. Dewangan, A. K. Maity, Y. D. Mayya +4
We report the discovery of intertwined/entangled sub-structures towards the bubble wall of NGC 3324 below a physical scale of 4500 AU, which is the sharp edge/ionization front/elon…
Estimation of Stellar Parameters and Mass Accretion Rate of Classical T Tauri Stars from LAMOST DR6
S. Nidhi, Blesson Mathew, B. Shridharan +3
Classical T Tauri stars are low-mass pre-main sequence stars with an active circumstellar environment. In this work we present the identification and study of 260 Classical T Tauri…
Study of the transient nature of classical Be stars using multi-epoch optical spectroscopy
Gourav Banerjee, Blesson Mathew, K. T. Paul +8
Variability is a commonly observed property of classical Be stars (CBe) stars. In extreme cases, complete disappearance of the Hα emission line occurs, indicating a disc-less state…
Emission line star catalogues post-Gaia DR3: A validation of Gaia DR3 data using LAMOST OBA emission catalogue
B. Shridharan, Blesson Mathew, Suman Bhattacharyya +9
Gaia DR3 and further releases have the potential to identify and categorise new emission-line stars in the Galaxy. We perform a comprehensive validation of astrophysical parameters…
Decoding the X-ray flare from MAXI J0709-159 using optical spectroscopy and multi-epoch photometry
Suman Bhattacharyya, Blesson Mathew, Savithri H Ezhikode +10
We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/GSC observations in soft and hard X-rays from MAXI J0709-159 in the direction of HD 54786 (…
Identification of emission-line stars in transition phase from pre-main sequence to main sequence
Suman Bhattacharyya, Blesson Mathew, Gourav Banerjee +3
Pre-main sequence (PMS) stars evolve into main sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in existing literature that examines and att…
Identification of new Classical Ae stars in the Galaxy using LAMOST DR5
R. Anusha, Blesson Mathew, B. Shridharan +6
We report the first systematic study to identify and characterize a sample of classical Ae stars in the Galaxy. The spectra of these stars were retrieved from the A-star catalog us…
Optical spectroscopy of Galactic field Classical Be stars
Gourav Banerjee, Blesson Mathew, K. T. Paul +3
In this study, we analyze the emission lines of different species present in 118 Galactic field classical Be stars in the wavelength range of 3800 - 9000 Å. We re-estimated the ext…
Chemical freeze-out systematics of thermal model analysis using hadron yield ratios
Sumana Bhattacharyya, Amaresh Jaiswal, Sutanu Roy
We provide a framework to estimate the systematic uncertainties in chemical freeze-out parameters extracted from analysis of thermal model, using hadron multiplicity ratios i…
Dynamics of QCD Matter -- current status
Amaresh Jaiswal, Najmul Haque, Aman Abhishek +58
In this article, there are 18 sections discussing various current topics in the field of relativistic heavy-ion collisions and related phenomena, which will serve as a snapshot of…
Systematics of chemical freeze-out parameters in heavy-ion collision experiments
Sumana Bhattacharyya, Deeptak Biswas, Sanjay K. Ghosh +2
We discuss systematic uncertainties in the chemical freeze-out parameters from the analysis of hadron multiplicity ratios in the heavy-ion collision experiments. The systemat…
Novel scheme for parametrizing the chemical freeze-out surface in Heavy Ion Collision Experiments
Sumana Bhattacharyya, Deeptak Biswas, Sanjay K. Ghosh +2
We introduce a new prescription for obtaining the chemical freeze-out parameters in the heavy-ion collision experiments using the Hadron Resonance Gas model. The scheme is found to…
Phenomenological bound on the viscosity of the hadron resonance gas
Snigdha Ghosh, Sabyasachi Ghosh, Sumana Bhattacharyya
We have explored some phenomenological issues during calculations of transport coefficients for hadronic matter, produced in the experiments of heavy ion collisions. Here, we have…