A young solar twin in the Rosette cluster NGC 2244 line of sight

Huber, Jeremy M. and Kielkopf, John F. and Mengel, Matthew and Carter, Bradley D. and Ferland, Gary J. and Clark, Frank O. (2018) A young solar twin in the Rosette cluster NGC 2244 line of sight. Monthly Notices of the Royal Astronomical Society, 476 (1). pp. 323-335. ISSN 0035-8711

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Abstract

Based on prior precision photometry and cluster age analysis, the bright star GSC 00154−01819 is a possible young pre-main sequence member of the Rosette cluster, NGC 2244. As part of a comprehensive study of the large-scale structure of the Rosette and its excitation by the cluster stars, we noted this star as a potential backlight for a probe of the interstellar medium and extinction along the sight line towards a distinctive nebular feature projected on to the cluster centre. New high-resolution spectra of the star were taken with the University College London Echelle Spectrograph of the AAT. They reveal that rather than being a reddened spectral type B or A star within the Mon OB2 association, it is a nearby, largely unreddened, solar twin of spectral type G2V less than 180 Myr old. It is about 219 pc from the Sun with a barycentric radial velocity of +14.35 ± 1.99 km s−1. The spectrum of the Rosette behind it and along this line of sight shows a barycentric radial velocity of +26.0 ± 2.4 km s−1 in H α, and a full width at half-maximum velocity dispersion of 61.94 ± 1.38 km s−1.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 17 Jul 2018 01:01
Last Modified: 17 Jul 2018 01:01
Uncontrolled Keywords: stars: distances, stars: solar-type, H II regions
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/sty188
URI: http://eprints.usq.edu.au/id/eprint/34449

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