A magnetized disk around an O star in W75N. A VLBI map of the OH maser |
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| Authors: | V I Slysh I E Val’tts V Migenes |
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| Institution: | (1) Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia;(2) Department of Astronomy, University of Guanajuato, Apdo Postal 144, Guanajuato, GTO, CP36000, Mexico |
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| Abstract: | W75N is a star-forming region containing ultracompact H II regions as well as OH, H2O, and methanol masers. The VLBA maps obtained show that the masers are located in a thin disk rotating around an O star, which is the exciting star for the ultracompact H II region VLA1. A separate group of maser spots is associated with the ultracompact H II region VLA2. The radial velocity of the maser spots varies across the disk from 3.7 to 10.9 km/s. The disk diameter is 4000 AU. The maser spots revolve in Keplerian orbits around the O9 star. |
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