1994A&A...288..475P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST06:57:43

1994A&A...288..475P - Astronomy and Astrophysics, volume 288, 475-501 (1994/8-2)

Monte-Carlo simulations of binary stellar evolution in young open clusters.

POLS O.R. and MARINUS M.

Abstract (from CDS):

We present a model for calculating the evolution of close binaries, including mass exchange episodes, in an approximate way. Our model covers all parts of parameter space (initial masses and orbital separations) for binaries with primaries more massive than 2M, and calculates the evolution until both stars have become compact objects. The model is described in detail and its approximations and uncertainties are discussed. The model is applied in Monte-Carlo simulations of a large population of stars, representing the initial population of young open clusters. The colour-magnitude diagrams of these synthetic clusters reproduce several observed features of real young open clusters that can be attributed to the presence of binaries. In particular, blue stragglers are produced as remnants of mass exchange in close binaries. We identify five types of blue straggler. Four of these types are binaries with helium-star, white-dwarf, neutron-star, and stripped main-sequence-star companions; the fifth type are single, merged main-sequence stars. We derive the expected numbers and properties of each of these blue-straggler types as a function of cluster age. The numbers and properties of our synthetic blue stragglers (rapid rotation, small or absent radial-velocity variations) are consistent with the observed incidence and characteristics of blue stragglers in clusters younger than about 300 Myr. In contrast, our model appears to be unable to account for all the observed blue stragglers in intermediate-age clusters (between 300 and 1500 Myr). Other observed features that are reproduced by the inclusion of binaries are: the occurrence of a second main sequence, the appearance of "yellow straddler" giants between the giant branch and the turn-off point, and the occurrence of "blue interlopers" below the main sequence.

Abstract Copyright:

Journal keyword(s): stars: close binaries - stars: evolution - HR diagram - open clusters - blue stragglers

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 NGC 457 OpC 01 19 35 +58 17.2   6.97 6.4     ~ 217 2
2 NGC 884 OpC 02 22 23 +57 07.5           ~ 448 0
3 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 756 0
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3022 0
5 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2693 0
6 M 41 OpC 06 46 01 -20 45.4   4.89 4.5     ~ 249 0
7 NGC 2281 OpC 06 48 17 +41 04.7   6.05 5.4     ~ 125 0
8 NGC 2362 OpC 07 18 41 -24 57.3     4.1     ~ 361 0
9 NGC 2516 OpC 07 58 04 -60 45.2           ~ 595 0
10 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1257 0
11 Cl* NGC 2632 S 179 * 08 41 47.7692433687 +19 24 43.905066661   11.95 11.42     K0.3 25 0
12 * tet Car SB* 10 42 57.4019674 -64 23 40.020796 1.53 2.54 2.76 2.87 3.10 B0Vp 313 0
13 IC 2602 OpC 10 42 58 -64 24.0           ~ 557 0
14 NGC 3532 OpC 11 05 39 -58 45.2           ~ 270 0
15 NGC 3766 OpC 11 36 18 -61 36.9   5.66 5.3     ~ 185 0
16 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 487 0
17 IC 4665 OpC 17 46 18 +05 43.0           ~ 317 0
18 NGC 6475 OpC 17 53 51 -34 47.6           ~ 339 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-06:57:43

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