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

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

2001A&A...370...87S - Astronomy and Astrophysics, volume 37087-99 (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).

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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 - 2026 		#notes
1 * zet Scl SB* 00 02 19.9270625208 -29 43 13.588516668 4.29 4.879 5.022     B5IV 139 0
2 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
3 HD 13402 * 02 12 57.2571550152 +59 32 18.782459880 8.26 8.59 8.10     B0.5Ib 76 0
4 Cl Stock 2 OpC 02 15 47.8 +59 33 12           ~ 155 0
5 HD 13735 * 02 15 55.3344978144 +59 24 08.748944568   9.28 8.89     A1V 35 0
6 HD 13909 * 02 17 35.0060959344 +59 32 09.399221592   8.99 8.68     A0IV 35 0
7 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
8 * 34 Per * 03 29 22.0494961351 +49 30 32.230623601 4.01 4.610 4.735     B3V 172 0
9 HD 21455 Be* 03 29 26.2864669176 +46 56 16.318187592   6.305 6.217 7.27   B7Vne 120 0
10 HD 21551 Pu* 03 30 36.9521337744 +48 06 12.973490460 5.46 5.78 5.82     B8V 138 0
11 * psi Per Be* 03 36 29.3797327450 +48 11 33.484405927 3.60 4.17 4.23     B5Ve 431 0
12 * del Per Be* 03 42 55.4928046977 +47 47 14.988257477 2.38 2.89 3.01 2.99 3.10 B5III 328 0
13 * 17 Tau Be* 03 44 52.5370897890 +24 06 48.016260072 3.19 3.59 3.70 3.71 3.80 B6IIIe 415 1
14 * q Tau SB* 03 45 12.4999931614 +24 28 02.185543730 3.73 4.19 4.30 4.30 4.40 B6IV 288 0
15 * 23 Tau Be* 03 46 19.5858871361 +23 56 54.092177220 3.70 4.12 4.18   4.16 B6IV(e) 446 2
16 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
17 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 557 1
18 * 28 Tau Be* 03 49 11.2165977912 +24 08 12.156712008 4.73 5.01 5.09   5.08 B8Vne 494 0
19 * eps Per bC* 03 57 51.2393818140 +40 00 36.719213615 1.71 2.71 2.89 2.96 3.14 B0.5III 533 0
20 * c Per Be* 04 08 39.6935695869 +47 42 45.038007366 3.45 4.00 4.03 3.91 3.93 B3Ve 394 0
21 M 36 OpC 05 36 19.8 +34 08 02   6.09 6.0     ~ 206 2
22 NGC 2323 OpC 07 02 47.3 -08 22 07           ~ 212 0
23 * d01 Pup * 07 39 27.3386401968 -38 18 28.884430663 3.99 4.65 4.84 4.92 5.08 B3V 105 0
24 * d04 Pup Be* 07 39 57.9910948536 -37 34 45.927401196 5.50 5.944 5.996     B5IV 78 0
25 NGC 2451A OpC 07 42 55.4 -38 15 05           ~ 159 0
26 NGC 2451 Cl* 07 45.4 -37 58           ~ 165 1
27 HD 63465 Pu* 07 47 24.9925592232 -38 30 40.110462576 4.32 4.952 5.068     B2IV/V 77 0
28 HD 73120 * 08 35 11.9458963992 -39 49 50.510979876   9.79 8.82     G5 6 0
29 HD 73618 ** 08 39 56.4981407544 +19 33 10.788354324   7.49 7.30     kA4mF0III 95 0
30 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
31 * 40 Cnc BS* 08 40 11.4526327416 +19 58 16.083202980   6.62 6.61     A1V 172 0
32 HD 73711 * 08 40 18.0969905712 +19 31 55.163632944   7.67 7.51     F0III 122 0
33 V* EP Cnc dS* 08 40 56.2946955456 +19 34 49.228381848 7.090 6.950 6.780     A6Vn 131 0
34 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
35 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
36 NGC 7092 OpC 21 31 04.0 +48 17 47           ~ 245 0

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