2011ApJ...726...27P


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET14:54:02

2011ApJ...726...27P - Astrophys. J., 726, 27 (2011/January-1)

An initial mass function for individual stars in galactic disks. I. Constraining the shape of the initial mass function.

PARRAVANO A., McKEE C.F. and HOLLENBACH D.J.

Abstract (from CDS):

We derive a semi-empirical galactic initial mass function (IMF) from observational constraints. We assume that the IMF, ψ(m), is a smooth function of the stellar mass m. The mass dependence of the proposed IMF is determined by five parameters: the low-mass slope γ, the high-mass slope -Γ (taken to be -1.35), the characteristic mass mch(∼ the peak mass of the IMF), and the lower and upper limits on the mass, m and mu(taken to be 0.004 and 120 M, respectively): ψ(m)dln m ∝ m –Γ{1 - exp [ - (m/mch)γ+Γ]}dln m. The values of γ and mch are derived from two integral constraints: (1) the ratio of the number density of stars in the range m = 0.1-0.6 M to that in the range m = 0.6-0.8 M as inferred from the mass distribution of field stars in the local neighborhood and (2) the ratio of the number of stars in the range m = 0.08-1 M to the number of brown dwarfs in the range m = 0.03-0.08 M in young clusters. The IMF satisfying the above constraints is characterized by the parameters γ = 0.51 and mch= 0.35 M(which corresponds to a peak mass of 0.27 M ). This IMF agrees quite well with the Chabrier IMF for the entire mass range over which we have compared with data, but predicts significantly more stars with masses <0.03 M; we also compare with other IMFs in current use and give a number of important parameters implied by the IMFs.

Abstract Copyright:

Journal keyword(s): evolution - stars: formation - stars: luminosity function, mass function

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 228 0
2 NGC 772 GiP 01 59 19.5556685548 +19 00 27.476398641 11.35 11.09 10.31 10.23 9.38 ~ 302 1
3 NGC 1333 SFR 03 28 55 +31 22.2   10.9       ~ 1195 1
4 IC 348 OpC 03 44 34 +32 09.8           ~ 1210 1
5 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2928 0
6 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3360 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1924 1
8 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1441 1
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1690 2
10 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 734 0
11 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1060 1
12 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 640 2
13 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3918 5
14 NGC 3603 HII 11 15 24 -61 15.0           ~ 926 2
15 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 536 1
16 HD 319718 ** 17 24 43.490 -34 11 57.03 12.28 11.94 10.44 10.05   O3.5If* 81 0
17 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 618 0
18 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 924 2

    Equat.    Gal    SGal    Ecl

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2020.01.28-14:54:02

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