2001A&A...377..512R

Query : 2001A&A...377..512R

2001A&A...377..512R - Astronomy and Astrophysics, volume 377512-521 (2001/10-2)

On the dispersion in lithium and potassium among late-type stars in young clusters: IC 2602.

RANDICH S.

Abstract (from CDS):

We have measured the equivalent width (EW) of the K I 7699Å line in a sample of G and K-type members of the ∼35 Myr old cluster IC 2602 for which a dispersion in Li EWs had been reported by previous studies. Active cluster stars with 0.75≲B-V0≲1 are characterized by a dispersion in the EW of the K I 7699Å, while earlier and later-type stars do not show any significant scatter. Cluster stars at all colors show potassium EW excesses with respect to field inactive stars; furthermore, a statistically significant relationship is found between differential potassium EWs and logLX/ Lbol ratios, indicating that the EWs of the potassium feature are altered by activity. Our results suggest that the dispersion in Li EWs observed among cluster stars later than B-V0∼1 cannot be fully explained by the effects of activity. No final conclusion can instead be drawn for earlier-type stars.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: IC 2602 - stars: abundances - stars: interiors

Simbad objects: 33

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Number of rows : 33
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 NGC 1039 OpC 02 42 09.1 +42 44 02           ~ 467 0
2 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 870 1
3 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
4 TYC 8960-1957-1 * 10 28 31.2267933336 -63 44 15.602582148   12.06 11.31     ~ 39 0
5 TYC 8964-165-1 * 10 29 32.7541192632 -63 49 15.558609936   12.37 11.34     K1IV 33 0
6 HD 91451 * 10 31 44.9206418496 -63 29 21.941207736   9.61 9.24 9.62   F2V 38 0
7 HD 307793 * 10 31 54.1069737648 -63 48 52.059350700   10.80 10.26     G5 22 0
8 TYC 8964-606-1 * 10 33 39.6722547984 -64 46 52.177192932   12.11 11.71     ~ 32 0
9 V* V542 Car BY* 10 33 41.8054383552 -64 13 45.694878996   12.30 11.75     K2.5IV(e) 40 0
10 HD 91895 ** 10 34 52.9014216236 -64 53 58.308152678   10.191 9.714 9.763   F6V 27 0
11 V* V546 Car BY* 10 36 37.9550737536 -64 47 53.793182148   13.84       ~ 40 0
12 Cl* IC 2602 W 71 * 10 38 17.6636337312 -64 08 06.426429648   11.21 10.52 10.09   G5 47 0
13 V* V550 Car BY* 10 39 55.9705701432 -63 59 30.093460584   13.10       ~ 42 0
14 TYC 8961-383-1 * 10 40 00.0331731240 -63 15 10.998100512   11.32 10.57 10.11 10.04 ~ 33 0
15 RX J1041.1-6316 X 10 41 07.4 -63 16 38     12.06     ~ 2 0
16 V* V555 Car BY* 10 42 07.0839584184 -64 46 07.839386688   12.40       G 52 0
17 V* V557 Car BY* 10 42 41.5146144624 -64 21 04.333829688   11.26 12.03     G2V 71 0
18 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
19 GSC 08965-00231 * 10 42 56.1040951464 -63 55 51.147555708   12.77 11.90 11.77   G8 36 0
20 V* V558 Car BY* 10 44 06.8106499248 -63 59 35.059923708   11.75       G4 57 0
21 HD 307960 * 10 44 13.9347547056 -64 46 27.324614496   12.23 11.32     K1V(e) 29 0
22 V* V559 Car BY* 10 44 22.5515649000 -64 15 30.116510712   11.61       G0 62 0
23 V* V561 Car BY* 10 44 59.6196312312 -65 02 19.075223040   11.44 10.88 10.54 10.128 G0 59 0
24 HD 93405 * 10 45 28.2397717680 -64 13 45.035793660   9.61 9.17     F3/5V 33 0
25 HD 308012 * 10 46 28.7870310120 -64 07 57.570933396   10.4 9.9     F8 46 0
26 V* V566 Car BY* 10 46 51.8026332840 -63 34 15.765895812   14.19       ~ 41 0
27 V* V567 Car BY* 10 48 18.3921107208 -64 09 53.338378428   11.0       G 39 0
28 V* V568 Car BY* 10 48 25.3946019792 -64 22 43.951155672   15.16       ~ 27 0
29 V* V569 Car BY* 10 49 26.2743503520 -64 38 59.971798320   14.72       ~ 20 0
30 V* V570 Car BY* 10 49 48.4012130280 -64 46 28.467956388   12.26 11.32     G9Ve 58 0
31 V* V571 Car BY* 10 49 56.8358871072 -63 48 19.080513396   14.19       ~ 24 0
32 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
33 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0

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