Abstract
The radiative transfer problem in non-LTE moving atmospheres has been explicitly solved for H..cap alpha.. line profiles. These computations have been done for a schematic model of the line-forming region over a wide range of optical depths and velocity gradients in order to cover the observed characteristics in 23 G and K supergiants. The best theoretical fits yield optical depths in the range 10-500 and velocity fields in the range 0.5-3 Doppler widths. The computed mass-flow rates lie in the range 10/sup -5/-10/sup -7/ Solar Mass yr/sup -1/; the higher the extent of the line-forming region, the lower the mass-loss rates. The effect of the extent on the H..cap alpha.. emission components has also been investigated in some detail.
Citation Formats
Mallik, S V.
Expanding chromospheres of late G and K supergiants.
United Kingdom: N. p.,
1986.
Web.
Mallik, S V.
Expanding chromospheres of late G and K supergiants.
United Kingdom.
Mallik, S V.
1986.
"Expanding chromospheres of late G and K supergiants."
United Kingdom.
@misc{etde_6024933,
title = {Expanding chromospheres of late G and K supergiants}
author = {Mallik, S V}
abstractNote = {The radiative transfer problem in non-LTE moving atmospheres has been explicitly solved for H..cap alpha.. line profiles. These computations have been done for a schematic model of the line-forming region over a wide range of optical depths and velocity gradients in order to cover the observed characteristics in 23 G and K supergiants. The best theoretical fits yield optical depths in the range 10-500 and velocity fields in the range 0.5-3 Doppler widths. The computed mass-flow rates lie in the range 10/sup -5/-10/sup -7/ Solar Mass yr/sup -1/; the higher the extent of the line-forming region, the lower the mass-loss rates. The effect of the extent on the H..cap alpha.. emission components has also been investigated in some detail.}
journal = []
volume = {222:2}
journal type = {AC}
place = {United Kingdom}
year = {1986}
month = {Sep}
}
title = {Expanding chromospheres of late G and K supergiants}
author = {Mallik, S V}
abstractNote = {The radiative transfer problem in non-LTE moving atmospheres has been explicitly solved for H..cap alpha.. line profiles. These computations have been done for a schematic model of the line-forming region over a wide range of optical depths and velocity gradients in order to cover the observed characteristics in 23 G and K supergiants. The best theoretical fits yield optical depths in the range 10-500 and velocity fields in the range 0.5-3 Doppler widths. The computed mass-flow rates lie in the range 10/sup -5/-10/sup -7/ Solar Mass yr/sup -1/; the higher the extent of the line-forming region, the lower the mass-loss rates. The effect of the extent on the H..cap alpha.. emission components has also been investigated in some detail.}
journal = []
volume = {222:2}
journal type = {AC}
place = {United Kingdom}
year = {1986}
month = {Sep}
}