Abundance variations in high-velocity interstellar gas
Journal Article
·
· Astrophys. J., Lett.; (United States)
Based on line-of-sight models and profile-fitting, abundance variations of Ca, Si, Fe, and Na in high-velocity interstellar clouds toward ..mu.. Colombae, HD 28497, and HD 50896 are discussed. The correlation of larger rations N (Ca II)/N (Na I) with increasing radial velocity, in clouds with 20 km s/sup -1/< or =vertical-bar..nu..vertical-bar< or =100 km s/sup -1/, is shown to quite likely be due to abundance variations in Ca, rather than an ionization effect. Copernicus UV data show that the ratios N (Fe II)/N (S II) and N (Si II)/N (S II) have the same velocity correlation as Ca II, and the ambiguity concerning the relative adundance of Na I to hydrogen is removed. Theories of grain disruption are discussed as they relate to the observed Ca, Si, and Fe enhancements and their correlation with cloud velocity.
- Research Organization:
- Princeton University Observatory
- OSTI ID:
- 7124470
- Journal Information:
- Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 211:3; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Grain disruption in interstellar hydromagnetic shocks
Copernicus observations of distant unreddened stars. I. Line of sight to MU Colombae and HD 28497
Galactic interstellar abundance surveys with IUE. III. Silicon, manganese, iron, sulfur, and zinc
Journal Article
·
Mon Aug 01 00:00:00 EDT 1977
· Astrophys. J.; (United States)
·
OSTI ID:7297861
Copernicus observations of distant unreddened stars. I. Line of sight to MU Colombae and HD 28497
Journal Article
·
Mon Jan 31 23:00:00 EST 1977
· Astrophys. J.; (United States)
·
OSTI ID:7304739
Galactic interstellar abundance surveys with IUE. III. Silicon, manganese, iron, sulfur, and zinc
Journal Article
·
Fri Jul 01 00:00:00 EDT 1988
· Astrophys. J.; (United States)
·
OSTI ID:6740904