Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196..115p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 115-127.
Astronomy and Astrophysics
Astrophysics
23
Binary Stars, Stellar Atmospheres, Stellar Spectra, Stellar Structure, Stellar Winds, Supergiant Stars, Color-Color Diagram, Photosphere, Radio Spectra, Stellar Models, Stellar Spectrophotometry
Scientific paper
The photospheric parameters of the hypergiant HR 8752 were determined on the basis of photometric and spectroscopic data. Results are T(eff) = 4200 K, log g(eff) = 0; the microturbulent velocity component is 5.9 + or - 0.4 km/s, a value close to the velocity of sound. The turbulent pressure and its gradient could be determined by making use of spectral lines originating at greatly different optical depths. From these values the (outward) turbulent acceleration is derived which appears to be comparable in value to the (inward) gravitational acceleration. This explains the strong instability of the star's photosphere. The long-standing problem of the enhancement of the ionic lines in the star's spectrum could be solved: the major parts of these lines originate in the part of the wind of the hypergiant that is ionized by a hot (B1) companion. The radio spectrum of HR 8752 is also emitted by the H(+) region and can be explained quantitatively. The rate of mass loss is about 2 x 10 to the -5th solar mass/yr.
de Jager Cornelis
Nieuwenhuijzen Hans
Piters Ankie
No associations
LandOfFree
The atmospheric structure, stellar wind and binary characteristics of the hypergiant HR 8752 (G0-5Ia+) 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 The atmospheric structure, stellar wind and binary characteristics of the hypergiant HR 8752 (G0-5Ia+), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The atmospheric structure, stellar wind and binary characteristics of the hypergiant HR 8752 (G0-5Ia+) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-853558