Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357l..37z&link_type=abstract
Astronomy and Astrophysics, v.357, p.L37-L40 (2000)
Astronomy and Astrophysics
Astrophysics
13
Masers, Polarization, Stars: Formation, Ism: Individual Objects: G34.3+0.2
Scientific paper
We observed the hydroxyl (OH) masers in the ground-state 1665 and 1667 MHz transitions toward the cometary HII region G34.3+0.2 with the Very Long Baseline Array (VLBA). Our observations were sensitive to both right and left circular polarizations with a spectral resolution of 0.176 km s-1 and an angular resolution of 8 x 31 mas. We detected 120 maser features in a region of 3 x 6 arcsec, including 15 Zeeman pairs separated by an average distance of only 2 mas were identified. The OH masers are associated with two newly formed stars in the G34.3+0.2 complex. One star ionizes a weak, ultra-compact HII region (source B) and has a magnetic field orientation predominantly away from us. The other star, or stars, power the dominant cometary HII region (source C) and the magnetic field along the northern rim of the cometary source is directed toward us.
Moran James Michael
Reid Mark J.
Zheng Xian
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