Other
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..760s&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 760-770.
Other
68
B Stars, O Stars, Oao 3, Stellar Mass Ejection, Stellar Spectra, Ultraviolet Spectra, Variable Stars, Absorption Spectra, Emission Spectra, Ionization, Scanning, Stellar Spectrophotometry, Stellar Winds
Scientific paper
The incidence and nature of variability occurring on time scales of years in the ultraviolet P Cygni profiles of 15 O and B stars are investigated using spectrophotometric data obtained with the Copernicus satellite. It is found that some change in at least a few details of the P Cygni profiles is evident in almost every case, that the changes in a few stars appear to represent substantial variations in the column densities of the particular ions observed, and that the changes in other stars are minor in nature and do not result from significant alterations in the quantity of material in the stellar winds. Most of the narrow absorption features are shown to be invariant in velocity, although their strengths have apparently changed in certain cases. The nature of the changes observed in each of the program stars is briefly described, the time scale for variability in the stellar winds is considered, and two stars (Zeta Pup and Delta Ori A) are identified for which some alteration in the total amount of material in the stellar wind has taken place. It is suggested that the narrow absorption features probably represent temperature gradients or plateaus in the stellar-wind velocity fields or may be caused by flat regions in the height dependence of the wind velocity.
No associations
LandOfFree
Long-term changes in ultraviolet P Cygni profiles observed with Copernicus 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 Long-term changes in ultraviolet P Cygni profiles observed with Copernicus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long-term changes in ultraviolet P Cygni profiles observed with Copernicus will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1130782