Altair's inclination from line profile analysis
arXiv:astro-ph/0408194 · doi:10.1051/0004-6361:20041315
Abstract
We present a detailed spectroscopic study of line broadening in the A7IV-V star Altair. In a wavelength region covering 690AA we reconstruct the overall broadening profile taking into account more than 650 spectral lines. From the broadening profile we determine the projected rotational velocity vsini, derive an upper limit for the equatorial velocity v from the shape of the profile and search for signatures of differential rotation. Our redetermined value of vsini is (227 +-11)km/s. Measuring the first two zeros of the Fourier transformed broadening profile yield no signatures of differential rotation. We derive that Altair is seen under an inclination angle higher than i=68deg and it rotates at v<245km/s or slower than 53% of breakup velocity on a 1sigma level.
A&A, accepted
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- Spectroscopic detection of Altair's non-radial pulsations
- High contrast imaging with Fizeau interferometry: The case of Altair
- Photometric determination of rotation axis inclination, rotation rate, and mass of rapidly rotating intermediate-mass stars