The small molecular cloud toward HD 169454

Abstract

view Abstract Citations (33) References (63) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Small Molecular Cloud toward HD 169454 Jannuzi, Buell T. ; Black, John H. ; Lada, Charles J. ; van Dishoeck, Ewine F. Abstract Optical absorption line observations of the B1 supergiant HD 169454 reveal the presence of an intervening translucent interstellar cloud. Millimeter wavelength observations of CO emission show that the absorption lines can be attributed to a well-defined cloud approximately 18 by 22 min in extent at the same radial velocity as the C2 and CN absorption lines. The map of the CO emission shows three large condensations and evidence of unresolved structure on smaller scales. Various procedures for determining the cloud mass are compared. The estimated mass is 7-14 M solar masses if the cloud lies at the distance (D about 125 pc) of an extended atomic cloud at the same radial velocity, and is 250-500 M solar masses if the kinematic distance (D about 750 pc) is adopted. The dynamical state of the cloud is examined. The composition and structure of the cloud are discussed with reference to detailed theoretical models and the properties of other interstellar clouds. Publication: The Astrophysical Journal Pub Date: September 1988 DOI: 10.1086/166707 Bibcode: 1988ApJ...332..995J Keywords: Absorption Spectra; B Stars; Interstellar Gas; Line Spectra; Molecular Clouds; Supergiant Stars; Carbon Monoxide; Cn Emission; Millimeter Waves; Radial Velocity; Astrophysics; INTERSTELLAR: MOLECULES; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 169454 full text sources ADS | data products SIMBAD (1)