2024MNRAS.531.3468Z

Query : 2024MNRAS.531.3468Z

2024MNRAS.531.3468Z - Mon. Not. R. Astron. Soc., 531, 3468-3478 (2024/July-1)

Determination method for binary fractions using the integrated spectrum.

ZHANG F., LI L., HAN Z. and WANG X.

Abstract (from CDS):

We need to resolve the individual stars for binary-fraction determinations of stellar systems. Therefore, it is not possible to obtain the binary fractions for dense or distant stellar systems. We propose a method to determine the binary fraction of a dense or distant stellar system: this method is first to determine the binary-fraction variation for any two adjacent regions and then to add up those binary-fraction variations along the radial direction to obtain the binary fraction for a stellar system. The binary-fraction variation is derived using 10 binary-fraction-sensitive spectral absorption feature indices (SAFIs) and the binary-fraction variation calibrations in terms of these SAFIs. Using this method, we first present the binary-fraction variations for 21 Galactic globular clusters (GCs). By comparison, we find that they agree well with the binary fractions based on the main-sequence fiducial line method from previous studies. This verifies that the above-mentioned method is feasible. Next, we present the binary-fraction variations of 13 Galactic GCs. We give the relationships between the binary fraction and various parameters, and find that the binary fraction is negatively correlated with NHB and NRR, the binary fraction of some studies is not strongly correlated with NBS, and the number of GCs with large binary fraction is greater for the extreme blue horizontal branch population ratio. Finally, if we want to obtain a more accurate binary fraction, we suggest that spectroscopic and photometric observations are conducted at an appropriate area interval for a stellar system.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): binaries: general - Galaxy: evolution - globular clusters: general - galaxies: fundamental parameters - galaxies:clusters

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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
4 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 547 0
5 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
6 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
7 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
8 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 499 0
9 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
11 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
12 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
13 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
14 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
15 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 302 0
16 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 394 0
17 NGC 6316 GlC 17 16 37.42 -28 08 24.0   10.33 9.03     ~ 247 0
18 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0
19 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 310 0
20 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 372 1
21 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
22 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
23 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
24 NGC 6522 GlC 18 03 34.08 -30 02 02.3           ~ 569 0
25 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 561 0
26 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 644 0
27 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 276 0
28 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
29 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
30 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
31 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
32 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
33 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
34 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
35 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
36 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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