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Title:
Altair's inclination from line profile analysis
Authors:
Reiners, A.; Royer, F.
Affiliation:
AA(Astronomy Department, University of California, Berkeley, CA 94720, USA ; Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany ), AB(Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland ; GEPI, CNRS UMR 8111, Observatoire de Paris, 5 place Janssen, 92195 Meudon Cedex, France )
Publication:
Astronomy and Astrophysics, v.428, p.199-204 (2004) (A&A Homepage)
Publication Date:
12/2004
Origin:
A&A
Astronomy Keywords:
stars: rotation, stars: early-type, line: profiles, stars: individual: Altair
DOI:
10.1051/0004-6361:20041315
Bibliographic Code:
2004A&A...428..199R

Abstract

We present a detailed spectroscopic study of line broadening in the A7IV-V star Altair. In a wavelength region covering 690 Å we reconstruct the overall broadening profile taking into account more than 650 spectral lines. From the broadening profile we determine the projected rotational velocity v sin i, 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 v sin i is (227 ± 11) km s-1. Measuring the first two zeros of the Fourier transformed broadening profile yields no signatures of differential rotation. We derive that Altair is seen under an inclination angle higher than i = 68° and it rotates at v < 245 km s-1 or slower than 53% of breakup velocity on a 1σ level.

Based on observations carried out at Observatoire de Haute-Provence (OHP), at the German-Spanish Astronomical Centre, Calar Alto, and retrieved from the Elodie Archive at Observatoire de Haute-Provence (OHP).

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