The Cygnus X region XXI. Radio emission at 1420 MHz from Cyg OB2 stars and two probable cometary HII regions

✍ Scribed by H. J. Wendker; L. A. Higgs; T. L. Landecker

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 602 KB
• Volume: 317
• Category: Article
• ISSN: 0004-6337
• DOI: 10.1002/asna.2113170110

✦ Synopsis

We have searched our previously published radio surveys of the Cygnus X region for faint radio point sources that may be associated with luminous stars of the Cyg OB2 association. Five positional coincidences have been found between stars and 1420 MHz radio sources. A particularly interesting example is the Wolf-Rayet star VCLS 146, which has shown a rapid change in 1420 MHz flux density. In addition, sensitive upper limits have been derived for the emission from 14 early-type stars, which help establish the time history of their non-thermal radio emission. Two radio features have been detected which have the properties of cometary HI1 regions, except that they are several arcminutes in size. Their detection provides evidence of recent star formation in Cyg OB2. K e y words: Early type stars -Cyg OB2 associationradio emissioncometary nebulae AAA subject classification: 112, 132, 152 1. 'IPAC is funded by NASA as part of the IRAS extended mission program under contract to JPL.