2004A&A...428..199R


Query : 2004A&A...428..199R

2004A&A...428..199R - Astronomy and Astrophysics, volume 428, 199-204 (2004/12-2)

Altair's inclination from line profile analysis.

REINERS A. and ROYER F.

Abstract (from CDS):

We present a detailed spectroscopic study of line broadening in the A7IV-V star Altair. In a wavelength region covering 690Å 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 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<245km/s or slower than 53% of breakup velocity on a 1σ level.

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: early-type - line: profiles - stars: individual: Altair

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * del02 Tau PM* 04 24 05.7614531616 +17 26 38.871301956 5.07 4.95 4.80 4.64 4.57 A2Vs 239 0
2 * 25 CVn ** 13 37 27.62782 +36 17 41.6337   5.05 4.82     A7III+A8V: 146 0
3 * gam Boo dS* 14 32 04.6717964 +38 18 29.704270 3.33 3.21 3.02 2.88 2.80 A7IV+(n) 252 0
4 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 875 1

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