Radio continuum observations of NML Cygni

Journal Article · Mon Mar 01 04:00:00 EST 1976 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/154211· OSTI ID:7352601

Gregory, P C; Seaquist, E R

An attempt to detect thermal radio emission from a compact circumstellar cloud about the infrared star NML Cyg has been carried out at three frequencies, 2.7, 8.1, and 10.5 GHz. Although positive results were obtained with single-dish observations at 10.5 GHz, the radio emission is not from a circumstellar cloud about NML Cyg. Instead it is postulated that the emission is from an H ii region with an angular extent of approx.2'. The red print of the Sky Survey shows a faint nebulosity of comparable angular size overlapping the star's position, lending support to this interpretation. The interferometer observations at 2.7 and 8.1 GHz provide an upper limit on the radio emission from any compact circumstellar cloud about NML Cyg of 2.8 mJy, which is well below the flux density expected for the absorbing cloud postulated by Davies et al. (1972). (AIP)

• Research Organization: Physics Department and Institute of Astronomy, University of British Columbia
• OSTI ID: 7352601
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 204:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
FREQUENCY DEPENDENCE
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
GIANT STARS
H2 REGIONS
HYDROXYL RADICALS
INFRARED RADIATION
INTERFEROMETRY
NEBULAE
RADIATIONS
RADICALS
RADIOWAVE RADIATION
STARS
SUPERGIANT STARS