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Near-Infrared Spectroscopy of Infrared-Excess Stellar Objects in the Young Supernova Remnant G54.1+0.3

Kim, Hyun-Jeong and Koo, Bon-Chul and Moon, Dae-Sik (2013) Near-Infrared Spectroscopy of Infrared-Excess Stellar Objects in the Young Supernova Remnant G54.1+0.3. Astrophysical Journal, 774 (1). Art. No. 5. ISSN 0004-637X.

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We present the results of broadband near-infrared spectroscopic observations of the recently discovered mysterious stellar objects in the young supernova remnant G54.1+0.3. These objects, which show significant mid-infrared-excess emission, are embedded in a diffuse loop structure of ~1' in radius. Their near-infrared spectra reveal characteristics of late O- or early B-type stars with numerous H and He I absorption lines, and we classify their spectral types to be between O9 and B2 based on an empirical relation derived here between the equivalent widths of the H lines and stellar photospheric temperatures. The spectral types, combined with the results of spectral energy distribution fits, constrain the distance to the objects to be 6.0 ± 0.4 kpc. The photometric spectral types of the objects are consistent with those from the spectroscopic analyses, and the extinction distributions indicate a local enhancement of matter in the western part of the loop. If these objects originate via triggered formation by the progenitor star of G54.1+0.3, then their formations likely began during the later evolutionary stages of the progenitor, although a rather earlier formation may still be possible. If the objects and the progenitor belong to the same cluster of stars, then our results constrain the progenitor mass of G54.1+0.3 to be between 18 and ~35 M_☉ and suggest that G54.1+0.3 was either a Type IIP supernova or, with a relatively lower possibility, Type Ib/c from a binary system.

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Moon, Dae-Sik0000-0003-4200-5064
Additional Information:© 2013 American Astronomical Society. Received 2013 April 8; accepted 2013 June 11; published 2013 August 8. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work was supported by NRF (National Research Foundation of Korea) Grant funded by the Korean Government (NRF-2012-Fostering Core Leaders of the Future Basic Science Program). B.-C.K. is supported by Basic Science Research program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (NRF-2011-0007223). D.-S.M. acknowledges support from the Natural Science and Engineering Research Council of Canada. This paper was studied with the support of the Ministry of Education, Science, and Technology (MEST) and the Korean Federation of Science and Technology Societies (KOFST). We thank Professor Sang-Gak Lee for helpful advice on calibration and analysis of TripleSpec spectra.
Funding AgencyGrant Number
National Research Foundation of KoreaNRF-2011-0007223
Ministry of Education, Science, and Technology (Korea)UNSPECIFIED
Korean Federation of Science and Technology Societies (KOFST)UNSPECIFIED
Subject Keywords: circumstellar matter; infrared: stars; ISM: individual objects (G54.1+0.3); stars: early-type; techniques: spectroscopic
Issue or Number:1
Record Number:CaltechAUTHORS:20130924-104817875
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Official Citation:Near-Infrared Spectroscopy of Infrared-Excess Stellar Objects in the Young Supernova Remnant G54.1+0.3 Hyun-Jeong Kim et al. 2013 ApJ 774 5
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41499
Deposited By: Ruth Sustaita
Deposited On:24 Sep 2013 18:10
Last Modified:19 Nov 2019 00:28

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