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

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

2001A&A...377..512R - Astronomy and Astrophysics, volume 377, 512-521 (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 logL_X/ L_bol 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

Full paper

View the references in ADS

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 - 2023	#notes
1	NGC 1039	OpC	02 42 07.4	+42 43 19						~	422	0
2	* alf Per	V*	03 24 19.3700924	+49 51 40.245455	2.64	2.27	1.79			F5Ib	828	1
3	Cl Melotte 22	OpC	03 46 24.2	+24 06 50						~	3362	0
4	TYC 8960-1957-1	*	10 28 31.2267933336	-63 44 15.602582148		12.06	11.31			~	28	0
5	TYC 8964-165-1	*	10 29 32.7541192632	-63 49 15.558609936		12.37	11.34			K1IV	25	0
6	HD 91451	*	10 31 44.9206418496	-63 29 21.941207736		9.61	9.24	9.62		F2V	29	0
7	HD 307793	*	10 31 54.1069737648	-63 48 52.059350700		10.80	10.26			G5	16	0
8	TYC 8964-606-1	*	10 33 39.6722547984	-64 46 52.177192932		12.11	11.71			~	24	0
9	V* V542 Car	BY*	10 33 41.8054383552	-64 13 45.694878996		12.30	11.75			K2.5IV(e)	29	0
10	HD 91895	**	10 34 52.9014216236	-64 53 58.308152678		10.14	9.58			F6V	23	0
11	V* V546 Car	BY*	10 36 37.9550737536	-64 47 53.793182148		13.84				~	28	0
12	Cl* IC 2602 W 71	*	10 38 17.6636337312	-64 08 06.426429648		11.21	10.52	10.09		G5	31	0
13	V* V550 Car	BY*	10 39 55.9705701432	-63 59 30.093460584		13.10				~	28	0
14	TYC 8961-383-1	*	10 40 00.0331731240	-63 15 10.998100512		11.32	10.57	10.11	10.04	~	27	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	35	0
17	IC 2602	OpC	10 42 27.1	-64 25 34						~	657	0
18	V* V557 Car	BY*	10 42 41.5146144624	-64 21 04.333829688		11.26	12.03			G2V	62	0
19	GSC 08965-00231	*	10 42 56.1040951464	-63 55 51.147555708		12.77	11.90	11.77		G8	23	0
20	V* V558 Car	BY*	10 44 06.8106499248	-63 59 35.059923708		11.75				G4	41	0
21	HD 307960	*	10 44 13.9347547056	-64 46 27.324614496		12.23	11.32			K1V(e)	22	0
22	V* V559 Car	BY*	10 44 22.5515649000	-64 15 30.116510712		11.61				G0	45	0
23	V* V561 Car	BY*	10 44 59.6196312312	-65 02 19.075223040		11.44	10.88	10.54	10.128	G0	47	0
24	HD 93405	*	10 45 28.2397717680	-64 13 45.035793660		9.61	9.17			F3/5V	26	0
25	HD 308012	*	10 46 28.7870310120	-64 07 57.570933396		10.4	9.9			F8	33	0
26	V* V566 Car	BY*	10 46 51.8026332840	-63 34 15.765895812		14.19				~	26	0
27	V* V567 Car	BY*	10 48 18.3921107208	-64 09 53.338378428		11.0				G	33	0
28	V* V568 Car	BY*	10 48 25.3946019792	-64 22 43.951155672		15.16				~	21	0
29	V* V569 Car	BY*	10 49 26.2743503520	-64 38 59.971798320		14.72				~	15	0
30	V* V570 Car	BY*	10 49 48.4012130280	-64 46 28.467956388		12.26	11.32			G9Ve	43	0
31	V* V571 Car	BY*	10 49 56.8358871072	-63 48 19.080513396		14.19				~	18	0
32	IC 4665	OpC	17 46 13.0	+05 36 54						~	358	0
33	NGC 6475	OpC	17 53 47.3	-34 50 28						~	377	0

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