Ultraviolet gas absorption and dust extinction toward M8

Abstract

view Abstract Citations (4) References (62) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet Gas Absorption and Dust Extinction toward M8 Boggs, Don ; Bohm-Vitense, Erika Abstract Interstellar absorption lines are analyzed using high-resolution IUE spectra of 11 stars in the young cluster NGC 6530 located in the M8 region. High-velocity clouds at -35 km/s and -60 km/s are seen toward all cluster stars. The components arise in gases that are part of large interstellar bubbles centered on the cluster and driven by stellar winds of the most luminous members. Absorption lines of species of different ionization states are separated in velocity. The velocity stratification is best explained as a 'champagne' flow of ionized gas away from the cluster. The C IV/Si IV ratios toward the hotter cluster members are consistent with simple photoionization models if the gas-phase C/Si ratio is increased by preferential accretion onto dust grains. High ion column densities in the central cluster decline with distance from W93, suggesting that radiation from a hot source near W93 has photoionized gas in the central cluster. Publication: The Astrophysical Journal Pub Date: August 1990 DOI: 10.1086/168998 Bibcode: 1990ApJ...358..441B Keywords: Absorption Spectra; Galactic Clusters; Gas Ionization; Interstellar Extinction; Interstellar Gas; Iue; B Stars; Cosmic Dust; H Ii Regions; Interstellar Matter; Photoionization; Astrophysics; CLUSTERS: OPEN; INTERSTELLAR: GRAINS; NEBULAE: INDIVIDUAL MESSIER NUMBER: M8; NEBULAE: H II REGIONS full text sources ADS | data products SIMBAD (25) MAST (1) INES (1)