On Mass-Ejection Sources in the Galactic Nucleus.

Abstract

view Abstract Citations (2) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On Mass-Ejection Sources in the Galactic Nucleus. Wehinger, Peter A. Abstract Mass ejection from various stellar sources is considered as a possible explanation for the observed neutral hydrogen outflow from the galactic center. Although 0- and B-type stars, M supergiants, T Tauri stars, and supernovae con- tribute to the enrichment of the interstellar medium in the spiral arms, they are not important in the central region of the Galaxy. Considerations are restricted to late-type dwarfs, M giants, planetary nebulae, and novae. Using available data for the galactic distribution of these objects and currently accepted mass-loss rates, their combined mass- ejection rate is 0.18 Mo/yr within 3.5 kpc from the galactic center. The major source of material is from the planetary nebulae, with an estimated ejection rate of 0.14 Mo/yr. The combined massejection rate is still less than the rate derived from the 21-cm data, i.e., 1 Mo/yr. In conclusion, it appears that some other sources and/or mechanisms may be required to account for the total mass outflow. Publication: The Astronomical Journal Pub Date: 1967 DOI: 10.1086/110472 Bibcode: 1967AJ.....72Q.837W full text sources ADS | data products SIMBAD (1)