Axial inclination and differential rotation for 19 rapidly rotating stars

Details Axial inclination and differential rotation for 19 rapidly rotating stars Axial inclination and differential rotation for 19 rapidly rotating stars

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..801s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, Aug. 15, 1987, p. 801-813.

Astronomy and Astrophysics

Astronomy

26

B Stars, Differential Equations, Inclination, Stellar Rotation, Stellar Spectra, Astronomical Photography, Helium, Line Spectra, Magnesium, Tables (Data)

Scientific paper

The widths and shapes of He I 4471 and Mg II 4481 absorption lines in spectra of 19 rapidly rotating B-type main-sequence stars were analyzed to estimate the axial inclination and the presence or absence of differential rotation. The data are multiple, superimposed photographic coude spectra. The calculations use non-LTE intensity profiles summed over the disk of a gravity darkened Roche model star. Results show a scatter of aspects from equator-on to pole-on, and a strong indication of a negative differential rotation parameter, suggesting that the angular velocity increases toward the poles. Error bars in the data are used to determine uncertainties in the derived parameters. Opportunities for further work are presented.

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