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Dust Structure Around Asymptotic Giant Branch Stars

Published online by Cambridge University Press:  30 December 2019

Devendra Raj Upadhyay ,
Lochan Khanal ,
Priyanka Hamal  and
Binil Aryal
Devendra Raj Upadhyay
Affiliation:
Amrit Campus, Tribhuvan University, G.P.O. Box: 102, Lainchour, Kathmandu, Nepal email: mnadphy03@gmail.com Central Department of Physics, Tribhuvan University, Kathmandu, Nepal email: aryalbinil@gmail.com
Lochan Khanal
Affiliation:
Amrit Campus, Tribhuvan University, G.P.O. Box: 102, Lainchour, Kathmandu, Nepal email: mnadphy03@gmail.com
Priyanka Hamal
Affiliation:
Amrit Campus, Tribhuvan University, G.P.O. Box: 102, Lainchour, Kathmandu, Nepal email: mnadphy03@gmail.com
Binil Aryal
Affiliation:
Central Department of Physics, Tribhuvan University, Kathmandu, Nepal email: aryalbinil@gmail.com
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Abstract

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This paper presents mass, temperature profile, and the variation of Planck’s function in different regions around asymptotic giant branch (AGB) stars. The physics of the interstellar medium (ISM) is extremely complex because the medium is very inhomogeneous and is made of regions with fairly diverse physical conditions. We studied the dust environment such as flux, temperature, mass, and inclination angle of the cavity structure around C-rich asymptotic giant branch stars in 60 μm and 100 μm wavelengths band using Infrared Astronomical Survey. We observed the data of AGB stars named IRAS 01142+6306 and IRAS 04369+4501. Flexible image transport system image was downloaded from Sky View Observatory; we obtained the surrounding flux density using software Aladin v2.5. The average dust color temperature and mass are found to be 25.08 K, 23.20 K and 4.73 × ;1026 kg (0.00024 M⊙), 2.58 × 1028 kg (0.013 M⊙), respectively. The dust color temperature ranges from 18.76 K ± 3.16 K to 33.21K ± K and 22.84 K ± 0.18 K to 24.48 K ± 0.63 K. The isolated cavity like structure around the AGB stars has an extension of 45.67 pc × 17.02 pc and 42.25 pc × 17.76 pc, respectively. The core region is found to be edge-on having an inclination angle of 79.46° and 73.99°, respectively.

Keywords

Stars: AGB and post-AGBmass-losscircumstellar matterdustISM: dust
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 525 - 526
Copyright
© International Astronomical Union 2019 

Footnotes

‡

The original version of this article was published with incorrect author information. A notice detailing this has been published and the error rectified in the online PDF and HTML copies.

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