2012A&A...548A..10M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST00:55:13

2012A&A...548A..10M - Astronomy and Astrophysics, volume 548A, 10-10 (2012/12-1)

Spin down of the core rotation in red giants.

MOSSER B., GOUPIL M.J., BELKACEM K., MARQUES J.P., BECK P.G., BLOEMEN S., DE RIDDER J., BARBAN C., DEHEUVELS S., ELSWORTH Y., HEKKER S., KALLINGER T., OUAZZANI R.M., PINSONNEAULT M., SAMADI R., STELLO D., GARCIA R.A., KLAUS T.C., LI J., MATHUR S. and MORRIS R.L.

Abstract (from CDS):

The space mission Kepler provides us with long and uninterrupted photometric time series of red giants. We are now able to probe the rotational behaviour in their deep interiors using the observations of mixed modes. We aim to measure the rotational splittings in red giants and to derive scaling relations for rotation related to seismic and fundamental stellar parameters. We have developed a dedicated method for automated measurements of the rotational splittings in a large number of red giants. Ensemble asteroseismology, namely the examination of a large number of red giants at different stages of their evolution, allows us to derive global information on stellar evolution. We have measured rotational splittings in a sample of about 300 red giants. We have also shown that these splittings are dominated by the core rotation. Under the assumption that a linear analysis can provide the rotational splitting, we observe a small increase of the core rotation of stars ascending the red giant branch. Alternatively, an important slow down is observed for red-clump stars compared to the red giant branch. We also show that, at fixed stellar radius, the specific angular momentum increases with increasing stellar mass. Ensemble asteroseismology indicates what has been indirectly suspected for a while: our interpretation of the observed rotational splittings leads to the conclusion that the mean core rotation significantly slows down during the red giant phase. The slow-down occurs in the last stages of the red giant branch. This spinning down explains, for instance, the long rotation periods measured in white dwarfs.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: interiors - stars: rotation - stars: late-type

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASS J18493004+4808458 RG* 18 49 30.0470802989 +48 08 45.675334033   12.65 11.88     G8IV 12 0
2 BD+42 3187 RG* 18 54 16.9545538305 +42 59 00.382313454       9.6   G2 68 0
3 KIC 9574650 RG* 18 59 58.6326813027 +46 14 30.260919560   12.71 11.81     K0II 18 0
4 KIC 9267654 RG* 19 00 07.4662980203 +45 45 32.504907285           K1IV 25 0
5 KIC 5858947 RG* 19 01 13.9625744549 +41 09 06.016394129   12.13 11.73     ~ 15 0
6 BD+49 2935 RG* 19 06 59.9010647441 +49 32 24.405411314   10.68 9.54     K0 17 0
7 KIC 10866415 RG* 19 35 59.6203950263 +48 17 30.377253715   12.64 11.52     K1IV 20 0
8 2MASS J19493651+4124143 RG* 19 49 36.5255261248 +41 24 14.226498569   12.22 11.22     ~ 25 0
9 HD 226069 RG* 19 50 04.5838236604 +39 52 21.579412468   10.78 9.767     K1III 21 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-00:55:13

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