2001A&A...370...87S

Query : 2001A&A...370...87S

2001A&A...370...87S - Astronomy and Astrophysics, volume 370, 87-99 (2001/4-4)

The IMF of open star clusters with Tycho-2.

SANNER J. and GEFFERT M.

Abstract (from CDS):

We studied the fields of nine nearby open star clusters based on the Tycho-2 catalogue. We determined membership probabilities for the stars in the cluster fields from the stellar proper motions and used the Tycho-2 photometry to compute the initial mass function (IMF) of the clusters from the main sequence turn-off point down to approx. 1M_☉. We found IMF slopes ranging from Γ=-0.69 down to Γ=-2.27 (when the Salpeter 1995 value would be Γ=-1.35). We also studied the membership of individual stars of special astrophysical interest. In some cases previous results had to be revised. As a by-product, we investigated some general properties of the Tycho-2 catalogue; we confirmed that the Tycho-2 proper motions show only marginal deviations from the Hipparcos catalogue. On the other hand, in some regions the completeness of the catalogue seems to decrease at magnitudes brighter than claimed by Hog et al. (2000A&A...355L..27H).

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: general - catalogs - astrometry - stars: kinematics - Hertzsprung-Russell (HR) and C-M diagrams - stars: luminosity function, mass function

Simbad objects: 36

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Number of rows : 36

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	* zet Scl	SB*	00 02 19.9270625208	-29 43 13.588516668	4.29	4.879	5.022			B5IV	133	0
2	Cl Blanco 1	OpC	00 03 24.7	-29 57 29						~	316	0
3	HD 13402	*	02 12 57.2571550152	+59 32 18.782459880	8.26	8.59	8.10			B0.5Ib	74	0
4	Cl Stock 2	OpC	02 15 25.4	+59 31 19						~	123	0
5	HD 13735	*	02 15 55.3344978144	+59 24 08.748944568		9.28	8.89			A1V	29	0
6	HD 13909	*	02 17 35.0060959344	+59 32 09.399221592		8.99	8.68			A0IV	30	0
7	Cl Melotte 20	OpC	03 26 28.1	+48 58 30						~	852	0
8	* 34 Per	*	03 29 22.0494961351	+49 30 32.230623601	4.01	4.610	4.735			B3V	161	0
9	HD 21455	Be*	03 29 26.2864669176	+46 56 16.318187592		6.305	6.217	7.27		B7Vne	109	0
10	HD 21551	Pu*	03 30 36.9521337744	+48 06 12.973490460	5.46	5.78	5.82			B8V	128	0
11	* psi Per	Be*	03 36 29.3797327450	+48 11 33.484405927	3.60	4.17	4.23			B5Ve	413	0
12	* del Per	Be*	03 42 55.5042561	+47 47 15.174633	2.38	2.89	3.01	2.99	3.10	B5III	318	0
13	* 17 Tau	Be*	03 44 52.5368818	+24 06 48.011217	3.19	3.59	3.70	3.71	3.80	B6IIIe	399	1
14	* q Tau	*	03 45 12.4957802	+24 28 02.209730	3.73	4.19	4.30	4.30	4.40	B6IV	274	0
15	* 23 Tau	Be*	03 46 19.5738428	+23 56 54.081244	3.70	4.12	4.18		4.16	B6IV(e)	431	2
16	Cl Melotte 22	OpC	03 46 24.2	+24 06 50						~	3387	0
17	* eta Tau	Be*	03 47 29.0765529	+24 06 18.488347	2.44	2.78	2.87	2.84	2.88	B7III	534	1
18	* 28 Tau	Be*	03 49 11.2165977912	+24 08 12.156712008	4.73	5.01	5.09		5.08	B8Vne	466	0
19	* eps Per	bC*	03 57 51.2320472	+40 00 36.775143	1.71	2.71	2.89	2.96	3.14	B1.5III	517	0
20	* c Per	Be*	04 08 39.6921578	+47 42 45.042937	3.45	4.00	4.03	3.91	3.93	B3Ve	380	0
21	M 36	OpC	05 36 20.2	+34 08 06		6.09	6.0			~	182	2
22	NGC 2323	OpC	07 02 44.2	-08 21 54						~	194	0
23	* d01 Pup	*	07 39 27.3386401968	-38 18 28.884430663	3.99	4.65	4.84	4.92	5.08	B3V	101	0
24	* d04 Pup	Be*	07 39 57.9910948536	-37 34 45.927401196	5.50	5.944	5.996			B5IV	75	0
25	NGC 2451A	OpC	07 42 56.6	-38 15 50						~	123	0
26	NGC 2451	Cl*	07 45.4	-37 58						~	158	1
27	HD 63465	Pu*	07 47 24.9925592232	-38 30 40.110462576	4.32	4.952	5.068			B2IV/V	70	0
28	HD 73120	*	08 35 11.9458963992	-39 49 50.510979876		9.79	8.82			G5	5	0
29	HD 73618	**	08 39 56.4981407544	+19 33 10.788354324		7.49	7.30			Am	90	0
30	* 40 Cnc	BS*	08 40 11.4526327416	+19 58 16.083202980		6.62	6.61			A1V	157	0
31	NGC 2632	OpC	08 40 13.0	+19 37 16						~	1526	0
32	HD 73711	*	08 40 18.0969905712	+19 31 55.163632944		7.67	7.51			F0III	112	0
33	V* EP Cnc	dS*	08 40 56.2946955456	+19 34 49.228381848	7.090	6.950	6.780			A6Vn	119	0
34	IC 2391	OpC	08 41 10.1	-52 59 28						~	811	0
35	IC 2602	OpC	10 42 27.1	-64 25 34						~	661	0
36	NGC 7092	OpC	21 31 33.4	+48 14 49						~	218	0

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