2006A&A...455..247T


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.04CEST23:34:15

2006A&A...455..247T - Astronomy and Astrophysics, volume 455, 247-254 (2006/8-3)

The blue stragglers formed via mass transfer in old open clusters.

TIAN B., DENG L., HAN Z. and ZHANG X.B.

Abstract (from CDS):

In this paper, we present the simulations for the primordial blue stragglers in the old open cluster M 67 based on detailed modelling of the evolutionary processes. The principal aim is to discuss the contribution of mass transfer between the components of close binaries to the blue straggler population in M 67. First, we followed the evolution of a binary of 1.4M+0.9M. The synthetic evolutionary track of the binary system revealed that a primordial blue straggler had a long lifetime in the observed blue straggler region of color-magnitude diagram. Second, a grid of models for close binary systems experiencing mass exchange were computed from 1Gyr to 6Gyr in order to account for primordial blue-straggler formation in a time sequence. Based on such a grid, Monte-Carlo simulations were applied for the old open cluster M 67. Adopting appropriate orbital parameters, 4 primordial blue stragglers were predicted by our simulations. This was consistent with the observational fact that only a few blue stragglers in M 67 were binaries with short orbital periods. An upper boundary of the primordial blue stragglers in the color-magnitude diagram (CMD) was defined and could be used to distinguish blue stragglers that were not formed via mass exchange. Using the grid of binary models, the orbital periods of the primordial BSs could be predicted. Compared with the observations, it is clear that the mechanism discussed in this work alone cannot fully predict the blue straggler population in M 67. There must be several other processes also involved in the formation of the observed blue stragglers in M 67.

Abstract Copyright:

Journal keyword(s): stars: blue stragglers - stars: binaries: close - Galaxy: open clusters and associations: individual: M 67

VizieR on-line data: <Available at CDS (J/A+A/455/247): table2.dat>

Status at CDS:  

Simbad objects: 27

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Number of rows : 27

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 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3536 0
2 Cl* NGC 2682 SAND 145 * 08 48 59.8390013766 +11 44 51.355319154   13.37 12.927     F2V 12 0
3 Cl* NGC 2682 SAND 277 SB* 08 49 21.4778473577 +12 04 22.967643329   12.74 12.225     F6V 16 0
4 NGC 2682 16 * 08 50 47.6623433181 +11 44 51.457232953 13.159 13.18 12.671   12.073 F7IV 23 0
5 NGC 2682 30 * 08 50 55.6921714248 +11 52 14.688264367   12.64 11.954   11.369 F9IV 33 0
6 NGC 2682 55 BS* 08 51 03.5151854004 +11 45 02.820816207   11.61 11.295   10.941 B9V 62 0
7 NGC 2682 81 BS* 08 51 11.7795102754 +11 45 22.122658355   9.96 10.024     B8V 88 0
8 NGC 2682 90 BS* 08 51 14.3527704821 +11 45 00.552999082   11.43 10.819   10.544 ~ 42 0
9 NGC 2682 95 SB* 08 51 15.4466081466 +11 47 31.470706228 13.211 13.17 12.680 12.355 12.044 F2 36 0
10 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2025 0
11 NGC 2682 124 BS* 08 51 19.9071059100 +11 47 00.440184381 12.576 12.59 12.117 11.848 11.564 F5IV 78 0
12 NGC 2682 130 V* 08 51 20.5734892159 +11 46 16.413587383 13.346 13.34 12.950   12.30 G: 54 0
13 Cl* NGC 2682 SAND 1082 Al* 08 51 20.7915 +11 53 26.168   11.66 11.150 11.09 10.722 F5IV 114 0
14 NGC 2682 134 V* 08 51 21.2238994560 +11 45 52.754566390 12.903 12.83 12.315 11.904 11.553 F5 59 0
15 NGC 2682 136 SB* 08 51 21.7525357665 +11 52 37.871016235   11.92 11.235   10.595 G3III-IV 69 0
16 NGC 2682 153 BS* 08 51 26.4324574507 +11 43 50.739583578   11.41 11.269   11.101 A2V 71 0
17 NGC 2682 156 BS* 08 51 27.0113270349 +11 51 52.589157089   11.1 10.940   10.862 A2V 65 0
18 Cl* NGC 2682 SAND 1036 EB* 08 51 28.1469824237 +11 49 27.498107329 13.262 13.27 12.809   12.184 F3 65 0
19 Cl* NGC 2682 SAND 2226 BS* 08 51 28.3616962557 +12 07 38.612462428   12.55 12.718     F2V 15 0
20 Cl* NGC 2682 SAND 1280 dS* 08 51 32.5774374306 +11 50 40.631621887 12.537 12.52 12.269 12.121 11.922 F0 53 0
21 NGC 2682 185 BS* 08 51 32.5947464395 +11 48 52.103353760   11.46 11.48   10.80 A0V 49 0
22 Cl* NGC 2682 SAND 1284 dS* 08 51 34.3152667184 +11 51 10.499055646   11.17 10.92   10.622 B9V 87 0
23 NGC 2682 207 BS* 08 51 37.6908292893 +11 37 03.773189933 12.629 12.91 12.344   11.777 F2V 24 0
24 NGC 2682 210 * 08 51 39.2309747379 +11 50 03.854655086 12.866 12.79 12.277   11.566 F8V 36 0
25 NGC 2682 238 BS* 08 51 48.6388096586 +11 49 15.655645246   11.23 10.913     A1V 38 0
26 BD+12 1930 BS* 08 52 10.7434436388 +11 44 05.870422307   10.81 10.700     A1V 51 0
27 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2257 0

    Equat.    Gal    SGal    Ecl

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2020.06.04-23:34:15

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