An H II region near NML Cygnus

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cygnus Constellation, H Ii Regions, Interstellar Masers, Radio Sources (Astronomy), Stellar Mass Ejection, Supergiant Stars, B Stars, Continuous Radiation, Hydroxyl Radicals, Ionized Gases, M Stars, Radio Telescopes, Thermal Radiation, Variable Stars, Water Masers

Scientific paper

Using the Westerbork Synthesis Radio Telescope, an extended continuum radio source near NML Cygnus has been detected at 21 cm. The source has a thermal spectrum between 2.8 and 21 cm and is associated with a faint H II region 35 arcsec to the west of NML Cygnus. It is argued that the H II region probably is physically associated with NML Cygnus. The H II region may have resulted from mass lost previously by the M supergiant and now ionized by a nearby B1-B2 star.

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