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 - 2021
#notes
1 * zet Scl SB* 00 02 19.9296342495 -29 43 13.597009065 4.29 4.879 5.022     B3/5V 126 0
2 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 260 0
3 HD 13402 * 02 12 57.2573832812 +59 32 18.782309046 8.26 8.59 8.10     B0.5Ib 69 0
4 Cl Stock 2 OpC 02 14 43 +59 29.1           ~ 102 0
5 HD 13735 * 02 15 55.3346148734 +59 24 08.748742275   9.28 8.89     A1V 24 0
6 HD 13909 * 02 17 35.0061172699 +59 32 09.399764649   8.99 8.68     A0IV 23 0
7 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 778 0
8 * 34 Per * 03 29 22.05019 +49 30 32.2114 4.01 4.610 4.735     B3V 156 0
9 HD 21455 Be* 03 29 26.2865159828 +46 56 16.317222688   6.305 6.217 7.27   B7Vne 98 0
10 HD 21551 * 03 30 36.9481554065 +48 06 12.977506037 5.46 5.78 5.82     B8V 118 0
11 * psi Per Be* 03 36 29.3798227 +48 11 33.478941 3.60 4.17 4.23     B5Ve 398 0
12 * del Per Be* 03 42 55.5042561 +47 47 15.174633 2.38 2.89 3.01 2.99 3.10 B5III 308 0
13 * 17 Tau Be* 03 44 52.5368818 +24 06 48.011217 3.19 3.59 3.70 3.71 3.80 B6IIIe 381 1
14 * q Tau * 03 45 12.4957802 +24 28 02.209730 3.73 4.19 4.30 4.30 4.40 B6IV 262 0
15 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 416 2
16 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3104 0
17 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 520 1
18 * 28 Tau Be* 03 49 11.2175463444 +24 08 12.172181348 4.73 5.01 5.09   5.08 B8Vne 443 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 498 0
20 * c Per Be* 04 08 39.6921578 +47 42 45.042937 3.45 4.00 4.03 3.91 3.93 B3Ve 369 0
21 M 36 OpC 05 36 18 +34 08.4   6.09 6.0     ~ 161 2
22 NGC 2323 OpC 07 02 47.5 -08 20 16           ~ 163 0
23 * d01 Pup * 07 39 27.3383375 -38 18 28.878559 3.99 4.65 4.84 4.92 5.08 B3V 96 0
24 * d04 Pup Be* 07 39 57.9912451679 -37 34 45.923730119 5.50 5.944 5.996     B5IV 71 0
25 NGC 2451A OpC 07 43 12 -38 24.0           ~ 89 0
26 NGC 2451 Cl* 07 45.4 -37 58           ~ 154 1
27 HD 63465 * 07 47 24.9927224690 -38 30 40.105236095 4.32 4.952 5.068     B2IV/V 62 0
28 HD 73120 * 08 35 11.9438778750 -39 49 50.492798068   9.79 8.82     G5 5 0
29 HD 73618 ** 08 39 56.4910221018 +19 33 10.817863022   7.49 7.30     Am 87 0
30 * 40 Cnc BS* 08 40 11.4527985964 +19 58 16.085231072   6.62 6.61     A1V 143 0
31 HD 73711 * 08 40 18.0972692668 +19 31 55.164675891   7.67 7.51     F0III 104 0
32 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1317 0
33 IC 2391 OpC 08 40 32 -53 02.0           ~ 741 0
34 V* EP Cnc dS* 08 40 56.2950535699 +19 34 49.231323265 7.090 6.950 6.780     A6Vn 109 0
35 IC 2602 OpC 10 42 58 -64 24.0           ~ 582 0
36 NGC 7092 OpC 21 31 48 +48 26.0           ~ 197 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-16:44:02

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