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Now showing items 1-13 of 13

Examining Barium Deuteride Molecules in Sunspots

Karthikeyan, B; Shanmugapriya, G; Rajamanickam, N; Bagare, S. P (American Astronomical Society, 2018-02)
Polarization Measurements of Selected Young Stars with Circumstellar Dusty Disks

Parthasarathy, M; Jain, S. K (American Astronomical Society, 2021-09)

BVRI polarization measurements of 14 selected young stars with circumstellar dust disks are presented. The interstellar polarization in the direction of these stars is not significant. The observed polarization data and ...
Outbursts of Comet 67P/Churyumov-Gerasimenko

Sharma, Kritti; Kelley, Michael S. P; Joharle, Simran; Kumar, Harsh; Swain, Vishwajeet; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu (IOP Publishing, 2021-12)

We monitored the comet 67P/Churyumov-Gerasimenko close to its perihelion in November 2021 with the GROWTH-India Telescope. We observed two outbursts of this comet on 2021 October 29.940 and November 17.864 UTC, -3.12 days ...
Gaia EDR3 Data of Post-AGB Stars with Overabundance of s-process Elements: Evolutionary Status and Binarity

Parthasarathy, M (American Astronomical Society, 2022-02)

Kamath et al. analyzed Gaia EDR3 data of 18 post-asymptotic giant branch (AGB) supergiants having overabundance of s-process elements, some of which exhibit unusually low luminosities in disagreement with expectations of ...
Evolutionary Status of Selected Post-AGB Single and Binary Stars in Gaia DR3

Parthasarathy, M; Kounkel, Marina; Stassun, Keivan G (IOP Publishing, 2022-08)

Gaia data is helping to further understand the evolutionary status of post-AGB and related stars. In this paper we present an analysis of Gaia DR3 data of post-AGB stars and post-AGB binaries with accurate parallaxes. Gaia ...
Smallest Scale Clumpy Star Formation in Stephan's Quintet Revealed from UV and IR Imaging

Joseph, P; George, K; Subramanian, S; Mondal, C; Subramaniam, A (IOP Publishing, 2022-09)

The spatial distribution and physical sizes of star-forming clumps at the smallest scales provide valuable information on hierarchical star formation (SF). In this context, we report the sites of ongoing SF at ∼120 pc along ...
Evolutionary Status of Selected Post-AGB Stars Based on Gaia DR3

Parthasarathy, M; Kounkel, M; Stassun, Keivan G (American Astronomical Society, 2022-10)

The evolutionary status of 24 post-AGB stars is presented based on Gaia DR3 data. All 24 stars have parallaxes accurate to better than 3σ and have RUWE values <1.4. Based on the Gaia DR3 distances the absolute luminosities ...
Fifteen Hypervelocity Stars Whose Gaia G Magnitudes are Less Than 16.0 and Radial Velocities Less Than-600 km per second

Parthasarathy, M (American Astronomical Society, 2023-12)

From Gaia DR3 data using a simple search criteria fifteen hypervelocity stars (HVS) are detected. These stars have radial velocities less than -600 km s-1, Gaia G magnitudes less than 16.0 and Renormalized Unit Weight Error ...
Seventeen 2 Micron All Sky Survey (2MASS) Hypervelocity Stars (HVS) from Gaia DR3

Parthasarathy, M (American Astronomical Society, 2024-01)

As part of an ongoing search for hypervelocity stars I found seventeen two micron all sky survey sources with Gaia G magnitudes less than 16.0 and radial velocities less than -600 km s-1. All these stars are brighter in ...
Thirty Bright High Velocity B, A, and F Stars that may have Late-type Companions

Parthasarathy, M (American Astronomical Society, 2024-01)

I found thirty high velocity stars that have large V ‑ K values compared to standard stars of similar spectral types indicating the possible presence of late-type companion stars. All these thirty stars are relatively ...
Galactic Bulge Hypervelocity (HVS) RR Lyrae Variable Stars and One High Galactic Latitude HVS HB Star

Parthasarathy, M (American Astronomical Society, 2024-01)

Six Galactic Bulge Hypervelocity (HVS) RR Lyrae stars and one high galactic latitude HVS Horizontal Branch (HB) star found from the ongoing search for HVS in the Gaia DR3 and SIMBAD data are presented. Some of these stars ...
A Selection of 23 Bright Hypervelocity Gaia DR3 Stars

Parthasarathy, M (American Astronomical Society, 2024-03)

From the Gaia DR3 data twenty three bright hypervelocity stars that have Tycho catalogue numbers are presented. All these stars are of high galactic latitude and some may be galactic halo stars. All of them have accurate ...
Forty Hypervelocity Stars from Gaia DR3

Parthasarathy, M (American Astronomical Society, 2024-04)

Forty hypervelocity stars (HVS) are detected from a search for HVS in Gaia DR3 data whose G magnitudes are less than 17.0 and radial velocities are more +400 km s‑1. The Gaia DR3 astrophysical parameters and spectra indicate ...

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