2004A&A...426.1021P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST09:03:34

2004A&A...426.1021P - Astronomy and Astrophysics, volume 426, 1021-1034 (2004/11-2)

The age-activity-rotation relationship in solar-type stars.

PACE G. and PASQUINI L.

Abstract (from CDS):

We present CaII K line chromospheric fluxes measured from high-resolution spectra in 35 G dwarf stars of 5 open clusters to determine the age-activity-rotation relationship from the young Hyades and Praesepe (0.6Gyr) to the old M 67 (∼4.5Gyr) through the two intermediate age clusters IC4651 and NGC3680 (∼1.7Gyr). The full amplitude of the activity index within a cluster is slightly above 60 % for all clusters but one, NGC 3680, in which only two stars were observed. As a comparison, the same Solar CaII index varies by ∼ 40 % during a solar cycle. Four of our clusters (Hyades and Praesepe, IC 4651 and NGC 3680) are pairs of twins as far as age is concerned; the Hyades have the same chromospheric-activity level as Praesepe, at odds with early claims based on X-ray observations. Both stars in NGC 3680 are indistinguishable, as far as chromospheric activity is concerned, from those in the coeval IC 4651. This is a validation of the existence of an age-activity relationship. On the other hand, the two intermediate age clusters have the same activity level as the much older M67 and the Sun. Our data therefore shows that a dramatic decrease in chromospheric activity takes place in solar stars between the Hyades and the IC 4651 age, of about 1Gyr. Afterwards, activity remains virtually constant for more than 3Gyr. We have also measured v sin i for all of our stars and the average rotational velocity shows the same trend as the chromospheric-activity index. We briefly investigate the impact of this result on the age determinations of field G dwarfs in the solar neighborhood; the two main conclusions are that a consistent group of ``young'' stars (i.e. as active as Hyades stars) is present, and that it is virtually impossible to give accurate chromospheric ages for stars older than ∼2Gyr. The observed abrupt decline in activity explains very well the Vaughan-Preston gap.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: activity - stars: chromosphere - stars: rotation

Simbad objects: 45

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Number of rows : 45

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 HD 20430 ** 03 17 26.3862804449 +07 39 20.918381490   7.958 7.373 7.050 6.739 F8 122 0
2 HD 20439 PM* 03 17 32.7801660070 +07 41 24.555463939   8.376 7.747 7.402 7.085 ~ 121 0
3 HD 25825 PM* 04 06 16.1277831435 +15 41 53.234613641   8.416 7.811 7.484 7.169 G0V 165 0
4 HD 26756 PM* 04 14 25.6502208510 +14 37 30.119616339   9.125 8.419 8.039 7.682 G5V 184 0
5 V* V1309 Tau BY* 04 14 27.2545515447 +12 26 07.132723657   8.682 8.030 7.673 7.341 G0 147 0
6 HD 26736 BY* 04 14 32.3143718674 +23 34 29.798017740   8.711 8.047 7.691 7.356 G5V 191 0
7 HD 27406 BY* 04 20 12.9666887102 +19 14 00.523124676   8.016 7.444 7.131 6.826 F9V+ 175 0
8 HD 27835 PM* 04 24 12.7839753099 +16 22 44.152489588   8.808 8.203 7.870 7.560 G0V 100 0
9 HD 27859 BY* 04 24 28.3272372657 +16 53 10.202274804   8.382 7.790     G2V 205 0
10 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2695 0
11 V* V993 Tau BY* 04 27 35.8913866973 +15 35 21.092605003   7.949 7.404 7.102 6.805 ~ 208 0
12 HD 28237 PM* 04 27 46.0745623833 +11 44 11.108366342   8.066 7.482     F8 131 0
13 HD 28344 BY* 04 28 48.2983169461 +17 17 07.686115512 8.57 8.456 7.837 7.498 7.180 G2V 256 0
14 HD 28635 SB* 04 31 29.3444023836 +13 54 12.322586634   8.300 7.746 7.445 7.147 F9V 127 0
15 HD 28992 BY* 04 34 35.3101760915 +15 30 16.643497474   8.530 7.898 7.556 7.226 ~ 188 0
16 HD 30589 PM* 04 49 32.1249664135 +15 53 19.474471734   8.324 7.739 7.412 7.111 F8 110 0
17 TYC 1395-1758-1 Ro* 08 37 46.6102814233 +19 26 18.049036568   11.243 10.635     F9V 38 0
18 K2-100 Ro* 08 38 24.3004849747 +20 06 21.828303951   11.085 10.521     G0V 60 0
19 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1259 0
20 Cl* NGC 2632 S 138 Ro* 08 40 42.4810997427 +19 33 57.626579766   12.063 11.331     G4V 49 0
21 Cl* NGC 2632 S 155 Ro* 08 41 10.3085858520 +19 49 07.003931605   12.268 11.495     G6.6 45 0
22 BD+20 2181 Ro* 08 41 25.8431960416 +19 56 36.849175368   11.342 10.687     G0V 50 0
23 BD+20 2184 Ro* 08 41 43.8163614906 +20 13 36.755425121   10.988 10.431     F7 57 1
24 Cl* NGC 2682 ES I-46 * 08 50 53.3447325187 +11 43 40.065214014 15.318 15.06 14.448   13.569 G0V 41 0
25 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2055 0
26 Cl* NGC 2682 ES I-3 SB* 08 51 24.8436428261 +11 48 04.037875415 15.432 15.26 14.516 14.121 13.669 G2V 18 0
27 NGC 2682 159 * 08 51 27.8885891317 +11 55 40.949719456 14.598 13.94 13.320   12.625 G1IV 33 0
28 Cl* NGC 2682 ES III-9 * 08 51 27.9474785266 +11 50 11.919029103 15.180 15.08 14.491   13.669 G4V 33 0
29 Cl* NGC 2682 ES III-13 * 08 51 29.9638668720 +11 51 09.062503600 14.821 14.72 14.191 13.773 13.398 G2V 31 0
30 NGC 2682 178 * 08 51 31.9171561313 +11 51 16.664399650 14.694 14.63 14.030 13.704 13.304 G0V 27 0
31 Cl* NGC 2682 ES II-7 * 08 51 36.0753568316 +11 47 47.049856350 15.268 15.14 14.486   13.745 G1V 35 0
32 NGC 3680 70 * 11 25 03.4758510149 -43 17 26.301529094   15.220 14.651     ~ 19 0
33 NGC 3680 OpC 11 25 38 -43 14.6   8.40 7.6     ~ 291 0
34 NGC 3680 60 * 11 26 20.7065618739 -43 13 07.466176954   14.99 14.36     ~ 24 0
35 Cl* IC 4651 MEI 6081 * 17 24 31.8192985679 -49 59 08.591581971           ~ 12 0
36 IC 4651 200 * 17 24 31.9672049907 -49 59 43.224503929   14.12 13.55     ~ 11 0
37 IC 4651 95 * 17 24 36.8673353386 -49 55 54.691175424   13.473 12.937     ~ 12 0
38 IC 4651 109 * 17 24 37.5542584853 -49 57 51.524626175   14.10 13.424     ~ 10 0
39 IC 4651 174 * 17 24 42.0637178257 -49 53 02.417010159   12.99 12.381     ~ 12 0
40 Cl* IC 4651 AMC 4226 * 17 24 43.4558015480 -50 01 01.274579314           ~ 15 0
41 IC 4651 77 * 17 24 46.0311708359 -49 54 51.049145684   14.09 13.53 13.48   ~ 12 0
42 IC 4651 17 * 17 24 48.0970124432 -49 55 47.356510983   15.250 14.545     ~ 13 0
43 IC 4651 OpC 17 24 49 -49 56.0           ~ 312 0
44 IC 4651 65 * 17 24 59.9717265502 -49 53 07.832280641       14.41   ~ 13 0
45 IC 4651 43 * 17 25 14.2401467688 -49 56 43.667985114   14.89 14.193     ~ 18 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-09:03:34

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