2002A&A...384..912R

Query : 2002A&A...384..912R

2002A&A...384..912R - Astronomy and Astrophysics, volume 384912-924 (2002/3-4)

Chromospherically young, kinematically old stars.

ROCHA-PINTO H.J., CASTILHO B.V. and MACIEL W.J.

Abstract (from CDS):

We have investigated a group of stars known to have low chromospheric ages, but high kinematical ages. Isochrone, chemical and lithium ages are estimated for them. The majority of stars in this group show lithium abundances much smaller than expected for their chromospheric ages, which is interpreted as an indication of their old age. Radial velocity measurements in the literature also show that they are not close binaries. The results suggest that they can be formed from the coalescence of short-period binaries. Coalescence rates, calculated taking into account several observational data and a maximum theoretical time scale for contact, in a short-period pair, predict a number of coalesced stars similar to what we have found in the solar neighbourhood.

Abstract Copyright: ∼

Journal keyword(s): stars: late-type - stars: chromospheres - Galaxy: evolution

CDS comments: HR 1006 is a misprint for HR 756 (=HD 20766).

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 870 PM* 00 12 50.2492819896 -57 54 45.394533396 8.344 8 7.226 6.803 6.416 K0V 100 0
2 HD 1237 PM* 00 16 12.6780107483 -79 51 04.244506480 7.692 7.335 6.578     G8V 262 1
3 HD 4308 PM* 00 44 39.2672095011 -65 38 58.277728125 7.31 7.193 6.552     G6VFe-0.9 267 1
4 V* CF Tuc RS* 00 53 07.7675726832 -74 39 05.608753668   8.31 7.90   6.730 G2/5V+F0 241 0
5 HD 7983 PM* 01 18 59.9850724126 -08 56 22.186543721 9.48 9.49 8.90 8.36 8.00 G3V 120 0
6 HD 13445 PM* 02 10 25.9181700303 -50 49 25.465181208   6.945 6.117     K1.5V 484 1
7 HD 16176 PM* 02 36 57.1893902395 +38 44 00.915326924   6.38   5.6   F5V 72 0
8 * iot Hor PM* 02 42 33.4666679022 -50 48 01.055138166   5.97 5.40     F8V 446 1
9 * zet01 Ret PM* 03 17 46.1634549490 -62 34 31.152456644 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 324 0
10 * zet02 Ret ** 03 18 12.8188824117 -62 30 22.904711032   5.814 5.228     G1V 399 0
11 * eps Eri BY* 03 32 55.8444911587 -09 27 29.739493865 5.19 4.61 3.73 3.00 2.54 K2V 2073 1
12 V* SZ Pic RS* 05 53 27.3640188912 -43 33 31.322359296   8.66 7.906   6.974 G8V 73 0
13 HD 42807 RS* 06 13 12.5028624208 +10 37 37.712484445   7.12   6.0   G5V 254 0
14 HD 51754 PM* 06 58 38.5387458343 -00 28 49.696648518 9.60 9.567 9.009 8.663 8.334 G2V 145 0
15 HD 65721 SB* 07 58 36.9036668585 -34 56 41.188249683   8.70 7.96     G9V 59 0
16 HD 74385 PM* 08 42 07.5168804480 -42 55 45.982020576 9.654 9.018 8.107 7.587 7.137 K2+V 60 0
17 * tau01 Hya SB* 09 29 08.9313661104 -02 46 08.182035516   5.06 4.60     F5V 201 0
18 HD 88742 PM* 10 13 24.7290968722 -33 01 54.194829479 7.06 6.97 6.38     G0V 167 0
19 HD 89995 PM* 10 23 14.6182657248 +05 41 39.284234232   7.00   6.3   F6V 77 0
20 BD+51 1696 Pe* 11 46 35.1556060454 +50 52 54.680145444 10.32 10.47   9.5   sdG0 172 0
21 HD 103432 PM* 11 54 32.0677586770 +19 24 40.421649501   8.93   7.8   G6V 119 0
22 HD 103431 PM* 11 54 35.0802907132 +19 25 40.174289982   9.19   8.0   G5 80 0
23 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 443 0
24 HD 120237A PM* 13 48 55.0652037503 -35 42 15.049233110   7.11 6.56 6.44   F9V 101 0
25 HD 123651 PM* 14 10 04.8137260968 -46 16 10.023664872   8.72 8.19     G0/1V 75 0
26 HD 124580 PM* 14 15 38.6850588480 -45 00 02.720144880   6.900 6.305     G0V 83 0
27 HD 131582 PM* 14 53 41.5755679337 +23 20 42.828361048 10.363 9.601 8.608 8.046 7.545 K3V 75 0
28 HD 131977 BY* 14 57 28.0007918772 -21 24 55.727265310 7.89 6.83 5.72 4.74 4.19 K4V 525 0
29 HD 138268 PM* 15 31 43.4084816952 -20 09 53.729658468   6.44 6.22     A5V 60 0
30 V* AT CrB BY* 16 06 29.5992526286 +38 37 56.065088402   9.57   8.0   K3V 129 0
31 * 12 Oph BY* 16 36 21.4496896968 -02 19 28.513024233 7.00 6.55 5.77 5.13 4.74 K1V 525 0
32 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 562 0
33 HD 152391 PM* 16 52 58.8025159848 -00 01 35.118396116   7.40 6.64     G8.5Vk: 396 0
34 V* V2213 Oph BY* 17 05 16.8186610814 +00 42 09.221511649   6.59   5.6   F8.5IV-V 352 0
35 HD 165401 PM* 18 05 37.4541846601 +04 39 25.797083469 7.443 7.399 6.786 6.432 6.09 G2V 236 0
36 BD+15 3364 PM* 18 07 18.6143970216 +15 56 45.575251692   9.27   8.2   G6 60 0
37 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 364 0
38 HD 230409 PM* 19 00 43.3339876251 +19 04 28.418294811   10.78   9.6   G0 97 0
39 HD 181321 SB* 19 21 29.7277723051 -34 59 00.356331012 7.22 7.11 6.48     G2V 151 0
40 HD 183216 PM* 19 29 40.5714208320 -30 47 51.933050700   7.74 7.14     G2V 73 0
41 * 42 Aql PM* 19 37 47.3178819696 -04 38 51.505017792   6.07 5.68     F5Vm 84 0
42 HD 189931 PM* 20 04 02.6779767944 -37 52 35.364287524   7.53 6.93     G1V 55 0
43 HD 196850 PM* 20 38 40.1900743416 +38 38 06.337967064   7.37   6.4   G1V 105 0
44 HD 202628 PM* 21 18 27.2696247000 -43 20 04.743062448   7.39 6.742     G5V 208 0
45 HD 202917 PM* 21 20 49.9576157736 -53 02 03.155667216   9.32 8.67   7.882 G7V 191 0
46 HD 206667 * 21 44 44.7950428128 -42 07 46.427122992   8.59 8.03 7.66 8.026 F8/G0V 50 0
47 * eps Ind PM* 22 03 21.6536261624 -56 47 09.522795714   5.75 4.69     K5V 616 0
48 HD 217343 PM* 23 00 19.2868499184 -26 09 13.504347252   8.12 7.48   6.75 G5V 122 0
49 HD 219709 SB* 23 18 36.6757820352 -58 18 22.862744064   8.15 7.51     G1V 59 0
50 HD 221231 PM* 23 31 02.8541141712 -69 04 36.262044012   7.70 7.10     G1V 48 0
51 HD 223913 PM* 23 53 39.8793669576 -65 56 49.686492768   7.23 6.65     G0V 42 0

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