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Investigation of silicon dicarbide (\(\hbox {SiC}_2\)) in circumstellar envelopes around carbon-rich AGB stars

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Abstract

For known values of rotational and centrifugal distortion constants in conjunction with electric dipole moment, we have calculated energies of 80 rotational levels of para-\(\hbox {SiC}_2\) and radiative transition probabilities for 299 radiative transitions between the levels. These radiative transition probabilities in conjunction with scaled values for collisional rate coefficients are employed for solving a set of 80 statistical equilibrium equations coupled with 299 equations of radiative transfer. Brightness temperatures of 7 strongest (2 absorption and 5 emission) lines are investigated. These 7 transitions, where 3 are not yet found in any cosmic object, may play important role for identification of \(\hbox {SiC}_2\) in a cosmic object.

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Acknowledgements

We are thankful to learned reviewer for positive and constructive suggestions. MKS is grateful to Hon’ble Dr. Ashok K. Chauhan, Founder President, and Hon’ble Dr. Atul Chauhan, Chancellor, Prof. Dr. Balvinder Shukla, Vice Chancellor, Amity University, for valuable support and encouragements. AKS is thankful to the authorities of Swami Vivekanand Subharti University for support and encouragement.

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Authors and Affiliations

  1. Amity Centre for Astronomy and Astrophysics, Amity Institute of Applied Sciences, Amity University, Sector 125, Noida, 201313, India

    M K Sharma

  2. Physics Department, Swami Vivekanand Subharti University, Subhartipuram, NH58, Delhi-Haridwar, Meerut Bypass Road, Meerut, 250005, India

    A K Sharma

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  1. M K Sharma
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Correspondence to M K Sharma.

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Sharma, M.K., Sharma, A.K. Investigation of silicon dicarbide (\(\hbox {SiC}_2\)) in circumstellar envelopes around carbon-rich AGB stars. Indian J Phys 94, 1869–1874 (2020). https://doi.org/10.1007/s12648-019-01634-0

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  • DOI: https://doi.org/10.1007/s12648-019-01634-0

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