| Name: PREETI PREETI |
| Affiliation: ARIES, Nainital |
| Conference ID: ASI2026_736 |
| Title: Spectroscopic Analysis of Stellar Winds in the Wolf-Rayet Star WR125 |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Preeti(Aryabhatta Research Institute of Observational Sciences, Nainital - 263001, India), Jeewan C Pandey(Aryabhatta Research Institute of Observational Sciences, Nainital - 263001, India) |
| Abstract: Wolf-Rayet (WR) stars are evolved massive stars characterized by strong stellar winds and prominent emission lines, which provide critical insights into late stages of stellar evolution and massive star feedback. In this work, we present near-infrared spectroscopic observations of WR 125, a WC9+O III binary system, obtained using the TANSPEC instrument at the 3.6m Devasthal Optical Telescope (DOT). The data were reduced using the standard TANSPEC pipeline, which includes telluric and barycentric corrections, ensuring high-quality calibrated spectra. The spectrum of WR 125 reveals multiple broad emission features that are consistent with its WC9+O III classification. Of particular interest is the detection of a P Cygni profile near 1.083 μm, a diagnostic feature of stellar winds. A Gaussian fitting procedure was applied to the profile, and the Doppler shift between the emission peak and absorption minimum was used to estimate the wind terminal velocity. We derive a terminal velocity of v∞ ≈ 3176 ± 116 km s⁻¹. Additionally, the radial velocity of the system was determined to be −81.32 ± 15.60 km s⁻¹. These results provide direct constraints on the wind velocity and systemic motion of WR 125, reinforcing its classification as a late-type WC star. The high terminal velocity highlights the efficiency of mass loss in the system and serves as a critical input for models of binary interaction and circumstellar environment formation. Future observations will focus on time-resolved spectroscopy to probe wind variability and binary interaction effects in similar kind of stars.
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