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

作者：Huber, Jeremy M.^*; Kielkopf, John F.^*; Mengel, Matthew; Carter, Bradley D.; Ferland, Gary J.; Clark, Frank O.

来源：Monthly Notices of the Royal Astronomical Society, 2018, 476(1): 323-335.

DOI：10.1093/mnras/sty188

• stars: distances
• stars: solar-type
• H II regions

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 alpha, and a full width at half-maximum velocity dispersion of 61.94 +/- 1.38 km s(-1).

• 出版日期2018-5