Microturbulence in the upper photosphere of Alpha Persei (F5 Ib) derived from ultraviolet spectral observations

Details Microturbulence in the upper photosphere of Alpha Persei (F5 Ib) derived from ultraviolet spectral observations Microturbulence in the upper photosphere of Alpha Persei (F5 Ib) derived from ultraviolet spectral observations

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..229s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 229-232.

Astronomy and Astrophysics

Astrophysics

11

Atmospheric Turbulence, Energy Dissipation, Photosphere, Stellar Atmospheres, Supergiant Stars, Ultraviolet Spectra, High Resolution, Line Of Sight, Nasa Programs, Shock Waves, Stellar Luminosity

Scientific paper

High-resolution ultraviolet spectra of the moderate supergiant α Per (F5 Ib) were studied to determine the dynamic state of its upper photosphere. It was found that the line-of-sight microturbulent velocity component ζμ in the region of origin of the UV spectrum (which is 73,000 km above that of formation of the visual spectrum) is about 5 km s-1, and is slightly smaller than the value derived from the visual spectrum. This is ascribed to dissipation of mechanical energy between the higher and lower layers where, respectively, the ultraviolet and visual light lines originate. Between these two levels, which are one scale height apart, the mechanical energy flux decreases to about 0.3 of its photospheric value. The consequent value for the (outward directed) turbulent acceleration gt is 24 cm s-2, more than one half the observationally determined effective acceleration of gravity.

Affiliated with

Also associated with

No associations

Rating

Microturbulence in the upper photosphere of Alpha Persei (F5 Ib) derived from ultraviolet spectral observations 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 Microturbulence in the upper photosphere of Alpha Persei (F5 Ib) derived from ultraviolet spectral observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microturbulence in the upper photosphere of Alpha Persei (F5 Ib) derived from ultraviolet spectral observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1772960