Zobrazeno 1 - 10
of 51
pro vyhledávání: '"R. K. S. Yadav"'
Autor:
Kuldeep Belwal, D. Bisht, Mohit Singh Bisht, Geeta Rangwal, Ashish Raj, Arvind K. Dattatrey, R. K. S. Yadav, B. C. Bhatt
Publikováno v:
The Astronomical Journal, Vol 167, Iss 5, p 188 (2024)
We conducted a photometric and kinematic analysis of the young open cluster NGC 2345 using CCD UBV data from 2 m Himalayan Chandra Telescope, Gaia Data Release 3, Two Micron All-Sky Survey, and the Photometric All-Sky Survey data sets. We found 1732
Externí odkaz:
https://doaj.org/article/4b7cf1c994c5400fba5be3c48184d500
Autor:
R. K. S. Yadav, Arvind K. Dattatrey, Geeta Rangwal, Annapurni Subramaniam, D. Bisht, Ram Sagar
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 2, p 251 (2024)
We present the study of four far-ultraviolet (FUV) bright stars in the field of the open cluster NGC 2420 using the Ultra Violet Imaging Telescope mounted on AstroSat. The three stars 525, 527, and 560 are members, while star 646 is a nonmember of th
Externí odkaz:
https://doaj.org/article/bd735cc6863d4a57901fcde58aa31c09
Autor:
Arvind K. Dattatrey, R. K. S. Yadav, Sharmila Rani, Annapurni Subramaniam, Gaurav Singh, Snehalata Sahu, Ravi S. Singh
Publikováno v:
The Astrophysical Journal, Vol 943, Iss 2, p 130 (2023)
We report the discovery of extremely low mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroSat's Ultra Violet Imaging Telescope (UVIT). Spectral energy distributi
Externí odkaz:
https://doaj.org/article/7eda8cb1c7e94267a68ff6aa3345530d
Autor:
Arvind K Dattatrey, R K S Yadav, Gourav Kumawat, Sharmila Rani, Gaurav Singh, Annapurni Subramaniam, Ravi S Singh
We report the discovery of four blue lurkers with low and extremely low-mass white dwarf (ELM WDs) companions in the Galactic globular cluster NGC 362 using AstroSat Ultra Violet Imaging Telescope (UVIT). We analyzed the multi-wavelength spectral ene
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bfffacbfd78f4ea5e4fa36c162bba6c
http://arxiv.org/abs/2305.09723
http://arxiv.org/abs/2305.09723
Autor:
R. K. S. Yadav, Aditya Jaiswal, Arvind K. Dattatrey, Shobhit Yadav, Nandish Nanjappa, Neelam Panwar, Mukesh Kumar Jaiswar, Krishna Reddey, Jayshreekar Pant, Biman J. Medhi
Publikováno v:
Journal of Astronomical Instrumentation.
In this paper, we present the instrumental characterization and performance of the 4[Formula: see text]k CCD detector mounted on a 104-cm Sampurnanand telescope located at ARIES, Manora Peak Nainital, India. A detailed description of the filter wheel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23d5429273177c7b4656992bbe2dd008
https://doi.org/10.1142/s2251171722400062
https://doi.org/10.1142/s2251171722400062
We present the intra-cluster kinematics and dynamics of three open clusters: NGC 1193, NGC 2355, and King 12 by incorporating kinematical and photometric data from Gaia DR3, as well as a ground-based telescope. After selecting cluster members based o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f2bcfdf0792efdf11da0593d43b68bb
Autor:
D. Bisht, Qingfeng Zhu, R. K. S. Yadav, Geeta Rangwal, Devesh P. Sariya, Alok Durgapal, Ing-Guey Jiang
This paper presents a deep investigation of two open clusters, Haffner 22 and Melotte 71, using astrometric and photometric data from Gaia EDR3. We identified 382 and 597 most probable cluster members with membership probability higher than 50 percen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a54dc1ef14190e61c2c718cb16c842d1
Autor:
Arvind K. Dattatrey, R. K. S. Yadav, Sharmila Rani, Annapurni Subramaniam, Gaurav Singh, Snehalata Sahu, Ravi S. Singh
We report the discovery of extremely low-mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroSats Ultra Violet Imaging Telescope (UVIT). Spectral Energy Distributio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4d9ae18def3e4ade2dab8a9c7959b6a
Autor:
Amit Kumar, S. B. Pandey, Avinash Singh, R. K. S. Yadav, B. K. Reddy, N. Nanjappa, S. Yadav, R. Srinivasan
In the present work, recent characterization results of the 4K$\times$4K CCD Imager (a first light instrument of the 3.6m Devasthal Optical Telescope; DOT) and photometric calibrations are discussed, along with measurements of the extinction coeffici
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b38048ea070fb20bc33ab02d9a89d00
http://arxiv.org/abs/2111.13018
http://arxiv.org/abs/2111.13018
Autor:
D. Bisht, Qingfeng Zhu, W. H. Elsanhoury, R. K. S. Yadav, Geeta Rangwal, Devesh P. Sariya, Alok Durgapal, Ing-Guey Jiang
Publikováno v:
The Astronomical Journal. 164:171
Open clusters are groups of stars that form simultaneously; hence, these are excellent probes to test theories of star formation, stellar evolution, and dynamics in the Milky Way disk. We carry out a detailed photometric and kinematic study of five p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::063d866c4757691ae939f5f906cfb296
https://doi.org/10.3847/1538-3881/ac8cf4
https://doi.org/10.3847/1538-3881/ac8cf4