Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..799k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Dec. 1981, p. 799-813.
Astronomy and Astrophysics
Astronomy
18
B Stars, Fine Structure, Interstellar Matter, Line Spectra, Stellar Coronas, Atmospheric Composition, Atmospheric Models, Calcium, Cn Emission, Radial Velocity, Sodium, Stellar Evolution, Stellar Models, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
High resolution observations of Ca II and Na I interstellar line profiles toward four halo B stars are analyzed in terms of multicloud models. Stellar CNO lines present in the spectra have been used in conjunction with an LTE model atmosphere program to derive values of effective temperature and microturbulence. Using these atmospheric parameters, stellar contributions to the interstellar Ca II and Na I profiles have been calculated and removed. The subsequent renormalized interstellar line profiles were analyzed to derive information on the radial velocities, internal velocity dispersions and column densities within individual interstellar clouds. The Na I/Ca II ratio decreases from a value of 2 to 0.02 with increasing radial velocity; this range is smaller than that found by previous workers using the doublet ratio method. Additionally, the stellar CNO lines in the halo stars imply a composition similar to that found for unevolved B stars in the galactic plane.
Blades Chris J.
Dufton Philip L.
Keenan Francis P.
McKeith Conal D.
No associations
LandOfFree
A fine analysis of stellar and interstellar lines towards four halo B stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A fine analysis of stellar and interstellar lines towards four halo B stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A fine analysis of stellar and interstellar lines towards four halo B stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1264657