2005A&A...430L..17R


Query : 2005A&A...430L..17R

2005A&A...430L..17R - Astronomy and Astrophysics, volume 430, L17-20 (2005/1-4)

Strong latitudinal shear in the shallow convection zone of a rapidly rotating A-star.

REINERS A., HUENSCH M., HEMPEL M. and SCHMITT J.H.M.M.

Abstract (from CDS):

We have derived the mean broadening profile of the star V102 in the region of the open cluster IC 4665 from high resolution spectroscopy. At a projected equatorial rotation velocity of vsini=(105±12)km/s we find strong deviation from classical rotation. We discuss several scenarios, the most plausible being strong differential rotation in latitudinal direction. For this scenario we find a difference in angular velocity of ΔΩ=3.6±0.8rad/d (ΔΩ/Ω=0.42±0.09). From the Hα line we derive a spectral type of A9 and support photometric measurements classifying IC 4665 V102 as a non-member of IC 4665. At such early spectral type this is the strongest case of differential rotation observed so far. Together with three similar stars, IC 4665 V102 seems to form a new class of objects that exhibit extreme latitudinal shear in a very shallow convective envelope.

Abstract Copyright:

Journal keyword(s): stars: rotation - line: profiles - stars: individual: IC 4665 V 102/P35 - clusters: individual: IC 4665

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 46273 ** 06 29 49.06454 -50 14 20.6831       6.36   F2V 66 0
2 HD 115810 * 13 19 04.2512105808 +35 07 40.731791772   6.26 6.02     A7IV 50 1
3 * y Cen ** 13 53 32.76039 -35 39 51.3200       6.74   F3V 54 0
4 IC 4665 OpC 17 46 13 +05 36.9           ~ 337 0
5 Cl* IC 4665 P 35 * 17 46 19.6498730520 +05 34 06.538548432   12.09 11.609   11.022 A9 9 0

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2022.05.21-15:45:47

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