2012A&A...548L...1D


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET01:04:23

2012A&A...548L...1D - Astronomy and Astrophysics, volume 548, L1-1 (2012/12-1)

Rotational periods and evolutionary models for subgiant stars observed by CoRoT.

DO NASCIMENTO J.-D.Jr, DA COSTA J.S. and CASTRO M.

Abstract (from CDS):

We present rotation period measurements for subgiants observed by CoRoT. Interpreting the modulation of stellar light that is caused by star-spots on the time scale of the rotational period depends on knowing the fundamental stellar parameters. Constraints on the angular momentum distribution can be extracted from the true stellar rotational period. By using models with an internal angular momentum distribution and comparing these with measurements of rotation periods of subgiant stars we investigate the agreement between theoretical predictions and observational results. With this comparison we can also reduce the global stellar parameter space compatible with the rotational period measurements from subgiant light curves. We can prove that an evolution assuming solid body rotation is incompatible with the direct measurement of the rotational periods of subgiant stars. Measuring the rotation periods relies on two different periodogram procedures, the Lomb-Scargle algorithm and the Plavchan periodogram. Angular momentum evolution models were computed to give us the expected rotation periods for subgiants, which we compared with measured rotational periods. We find evidence of a sinusoidal signal that is compatible in terms of both phase and amplitude with rotational modulation. Rotation periods were directly measured from light curves for 30 subgiant stars and indicate a range of 30 to 100 d for their rotational periods. Our models reproduce the rotational periods obtained from CoRoT light curves. These new measurements of rotation periods and stellar models probe the non-rigid rotation of subgiant stars.

Abstract Copyright:

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

Simbad objects: 31

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Number of rows : 31

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 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2588 0
2 CoRoT 102627000 * 06 42 04.8501286218 -01 02 55.620139368   15.051 14.028 13.874   G8IV 2 0
3 CoRoT 102636100 * 06 42 18.1864434532 -01 15 03.031120670           K8V 2 0
4 CoRoT 102645577 * 06 42 30.4797294888 -01 00 10.298039937   15.867 14.661 14.325   K6III 1 0
5 CoRoT 102690215 * 06 43 26.6385604171 -01 10 59.015748176   15.654 14.629 14.58   K3III 1 0
6 CoRoT 102736038 * 06 44 27.7745281185 -00 56 47.836445560   15.84 15.067 14.985   G9III 1 0
7 CoRoT 100519170 * 19 22 58.3203145793 +01 24 22.718828461   17.545 16.181 15.77   K2V 1 0
8 CoRoT 100543054 * 19 23 06.9051496711 +01 19 34.416467889   16.868 15.535 15.92   K0V 1 0
9 CoRoT 100570829 V* 19 23 16.9894417367 +01 11 36.581483326     15.199 14.976   K0IV 2 0
10 CoRoT 100603128 V* 19 23 28.6129872627 +01 25 51.458306204     16.428     ~ 4 0
11 CoRoT 100686488 * 19 23 58.6705059909 +00 56 53.256367548       16.384   M0V 1 0
12 CoRoT 110603474 * 19 24 00.5482911064 +00 44 53.437432058   15.924 14.773 14.811   K0IV 1 0
13 CoRoT 100698726 * 19 24 03.6665180016 +01 10 29.367783458       15.907   M0V 1 0
14 CoRoT 100722142 * 19 24 13.3421420956 +01 13 31.974682909       15.352   K5V 1 0
15 CoRoT 100723404 * 19 24 13.9666256491 +01 23 40.301819613       15.772   K5V 1 0
16 CoRoT 100726847 * 19 24 15.9398408530 +00 40 16.160896976       16.089   M0V 1 0
17 CoRoT 100736747 * 19 24 19.4550706590 +01 14 26.480033560   16.6 15.51 15.253   K5V 3 0
18 CoRoT 100754501 * 19 24 25.1137563050 +00 52 07.269244345       14.646   M0V 1 0
19 CoRoT 100796424 * 19 24 38.5325372383 +00 52 59.517308445           K2V 2 0
20 CoRoT 100799876 V* 19 24 39.6174798787 +00 41 46.927333406     15.766 15.308   M0V 2 0
21 CoRoT 100820430 * 19 24 46.1120299514 +00 37 34.314896104   16.585 15.354 14.778   K5V 1 0
22 CoRoT 100840079 * 19 24 52.2938247531 +00 50 46.226329838       15.698   K5V 1 0
23 CoRoT 100894594 V* 19 25 09.5563710018 +01 28 32.403855946   17.136 16.245 16.131   G5V 2 0
24 CoRoT 100914011 * 19 25 15.7400781106 +01 36 37.615006070   16.464 15.323 15.296   G5IV 1 0
25 CoRoT 101119921 * 19 26 33.9497695087 +00 39 56.007089871       15.886   M0V 1 0
26 CoRoT 101139463 * 19 26 41.2850620612 +00 33 40.760864131       15.828   K5V 1 0
27 CoRoT 101195094 V* 19 27 02.2504258569 +00 32 37.546499065     15.825 15.824   K5V 2 0
28 CoRoT 101237986 * 19 27 18.3588198116 +00 31 29.588470938       15.843   K5V 1 0
29 CoRoT 101297209 * 19 27 40.2853960836 +00 41 55.197940544   14.807 13.916 13.737   G2I 1 0
30 CoRoT 101541502 * 19 29 26.1360450455 -00 00 51.278976192       14.922   G8V 1 0
31 CoRoT 101642233 * 19 30 10.5784582506 +00 02 32.853535033       15.709   M0V 1 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-01:04:23

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