2001A&A...375..851M


Query : 2001A&A...375..851M

2001A&A...375..851M - Astronomy and Astrophysics, volume 375, 851-862 (2001/9-1)

Accurate Vsini measurements in M 67: The angular momentum evolution of 1.2 M stars.

MELO C.H.F., PASQUINI L. and DE MEDEIROS J.R.

Abstract (from CDS):

By using FEROS spectrograph commissioning observations, we build a calibration of the FEROS cross-correlation function (CCF) to determine accurate projected rotational velocities Vsini for slow rotating F-K dwarf and giant stars. We apply this calibration to a sample of 28 main sequence, turnoff and giant stars belonging to the old open cluster M 67. We find that the stars behave in a very regular manner, depending on their position in the Color-Magnitude (C-M) diagram. Early main sequence G stars have a rotational velocity two times larger than the Sun, and they show a possible trend with (B-V) color, in that redder colors correspond to lower Vsini. The stars at the turnoff are the fastest rotators, with Vsini between 6.3 and 7.6km/s, while stars just above the turn-off are already significantly slower, with values between 4.6 and 4.9km/s. Along the Red Giant Branch (RGB), rotation decreases smoothly and for stars above (B-V)>1, only upper limits can be found, including for 4 clump stars. Analyzing the angular momentum history of 1.2M stars with the help of theoretical evolutionary tracks, we see that these stars probably obey different angular momentum evolution laws on the main sequence and along the RGB: while on the main sequence some extra braking is required in addition to angular momentum conservation, along the RGB the data are well represented by the IΩ=C law. Finally, comparing the Vsini of the M 67 turnoff stars with their main sequence progenitors in the younger open clusters NGC 3680 and Hyades we find that the younger clusters show substantially higher rotation rates. This indicates that 1.2M stars do experience main sequence braking. This could be relevant also for the interpretation of the nature of the ``Lithium gap''.

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: interior - open clusters and associations: individual: M 67

CDS comments: In ref list 1990AJ.100.1881M is a misprint for 1990AJ.100.1859M.

Simbad objects: 42

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Number of rows : 42
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 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 508 0
2 HD 4628 PM* 00 48 22.9759750919 +05 16 50.209484954 7.22 6.64 5.74 4.99 4.52 K2.5V 471 0
3 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1171 1
4 * gam Tau ** 04 19 47.6038491 +15 37 39.515422 5.46 4.64 3.65 4.83   G9.5IIIabCN0.5 530 0
5 * del Tau SB* 04 22 56.0951595936 +17 32 33.049802364 5.56 4.74 3.76 5.56   G9.5IIICN0.5 508 0
6 * eps Tau ** 04 28 37.0002551195 +19 10 49.563140930 5.42 4.54 3.53     G9.5IIICN0.5 567 1
7 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2843 0
8 NGC 2682 72 RG* 08 51 08.3845013448 +11 47 12.146447796   13.39 12.315     F0V 64 0
9 NGC 2682 73 * 08 51 08.5682228256 +11 50 53.061379440 14.471 14.39 13.779 13.450 13.096 G0V 30 0
10 NGC 2682 84 RG* 08 51 12.6931158192 +11 52 42.446745336   11.629 10.393 10.234 9.500 K1III 118 0
11 NGC 2682 105 RG* 08 51 17.0998188072 +11 48 16.173832932   11.554 10.316 9.942 9.07 K2III 133 0
12 NGC 2682 106 V* 08 51 17.3469363072 +11 47 00.664213272 13.671 13.638 13.069   12.393 ~ 59 0
13 Cl* NGC 2682 SAND 986 EB* 08 51 17.9917758696 +11 45 54.232467732 13.363 13.28 12.733   12.04 ~ 72 0
14 NGC 2682 115 V* 08 51 18.5413189200 +11 49 21.513324180 13.309 13.26 12.645 12.274 11.924 F9IV 74 0
15 NGC 2682 127 V* 08 51 20.1237509496 +11 46 41.751494436 13.336 13.32 12.776   12.08 ~ 77 0
16 NGC 2682 125 * 08 51 20.1572791392 +11 52 48.018858132 14.533 14.44 13.913   13.179 ~ 40 0
17 NGC 2682 128 * 08 51 20.3300020320 +11 45 52.481465496 13.782 13.72 13.244   12.445 ~ 59 0
18 NGC 2682 129 * 08 51 20.5508066664 +11 46 04.890109584 13.826 13.75 13.308   12.490 ~ 56 0
19 NGC 2682 135 RG* 08 51 21.5640702312 +11 46 06.216394188   12.53 11.394   10.39 K1III 99 0
20 NGC 2682 137 SB* 08 51 21.7550090064 +11 51 42.057856260   14.7 14.098   13.281 G2V 24 0
21 NGC 2682 140 Ro* 08 51 22.0511842656 +11 46 41.010219552 13.811 13.797 13.189 12.834 12.496 ~ 65 0
22 NGC 2682 141 RG* 08 51 22.8036640800 +11 48 01.779545736   11.570 10.346 10.180 9.40 ~ 130 0
23 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2173 0
24 Cl* NGC 2682 ES II-1 * 08 51 28.6970321736 +11 48 02.197022616 14.501 14.45 13.821   13.040 G1V 29 0
25 NGC 2682 164 RG* 08 51 28.9910274072 +11 50 33.127331784   11.675 10.441 10.250 9.46 K1III 125 0
26 NGC 2682 166 * 08 51 29.3544247680 +11 45 27.647071884 14.413 13.85 12.910   11.962 K0IV 58 0
27 BD+12 1926 RG* 08 51 29.9058258360 +11 47 16.870629444   11.004 9.555 9.360 8.36 K3III 134 0
28 NGC 2682 179 SB* 08 51 32.0621735592 +11 55 08.639510232 14.424 14.33 13.728   12.951 G0V 28 0
29 NGC 2682 193 RG* 08 51 35.7789056016 +11 53 34.748492712 13.904 13.22 12.267   11.228 K0III 90 0
30 NGC 2682 209 * 08 51 39.0509285256 +11 47 55.413468276 14.461 14.33 13.783   12.992 ~ 49 0
31 Cl* NGC 2682 ES III-35 RG* 08 51 39.3860048856 +11 51 45.671254056 13.832 13.1 12.117   11.078 K0III 58 0
32 NGC 2682 217 RG* 08 51 42.3635843520 +11 51 23.075134668   12.80 11.23     K1III 70 0
33 NGC 2682 224 RG* 08 51 43.5490441608 +11 44 26.477313396   11.894 10.686 10.460 9.660 K1III 98 0
34 NGC 2682 223 RG* 08 51 43.8874792752 +11 56 42.528745068   11.658 10.476   9.500 K1III 88 0
35 NGC 2682 226 * 08 51 44.0075287632 +11 46 24.535277112 13.749 13.549 12.790   11.928 G0 61 0
36 NGC 2682 266 RG* 08 51 59.5227693576 +11 55 04.835590284   11.65 10.463   9.490 ~ 81 0
37 NGC 3680 OpC 11 25 34 -43 14.4   8.40 7.6     ~ 298 0
38 * eps Vir PM* 13 02 10.5978496 +10 57 32.941443 4.45 3.71 2.79 2.16 1.71 G8III-IIIb 535 0
39 * 12 Oph BY* 16 36 21.4496896968 -02 19 28.513024233 7.00 6.55 5.77 5.13 4.74 K1V 464 0
40 * 36 Oph B PM* 17 15 20.9838262152 -26 36 10.173444860   5.88 5.03     K1V 235 0
41 * 71 Oph * 18 07 18.3593981592 +08 44 01.922061912   5.592 4.640     G8III 170 0
42 * 51 Peg PM* 22 57 27.9804852576 +20 46 07.797040104 6.39 6.16 5.46 4.97 4.61 G2IV 1115 1

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2022.05.21-15:37:11

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