2020MNRAS.499.2327G

Query : 2020MNRAS.499.2327G

2020MNRAS.499.2327G - Mon. Not. R. Astron. Soc., 499, 2327-2339 (2020/December-1)

How well can we determine ages and chemical abundances from spectral fitting of integrated light spectra?

GONCALVES G., COELHO P., SCHIAVON R. and USHER C.

Abstract (from CDS):

The pixel-to-pixel spectral fitting technique is often used in studies of stellar populations. It enables the user to infer several parameters from integrated light spectra such as ages and chemical abundances. In this paper, we examine the question of how the inferred parameters change with the choice of wavelength range used. We have employed two different libraries of integrated light spectra of globular clusters (GCs) from the literature and fitted them to stellar population models using the code STARLIGHT. We performed tests using different regions of the spectra to infer reddening, ages, [Fe/H], and [α/Fe]. Comparing our results to age values obtained from isochrone fitting and chemical abundances from high-resolution spectroscopy, we find that: (1) the inferred parameters change with the wavelength range used; (2) the method in general retrieves good reddening estimates, specially when a wider wavelength range is fitted; (3) the ideal spectral regions for determination of age, [Fe/H], and [α/Fe] are 4170-5540, 5280-7020, and 4828-5364 Å, respectively; (4) the retrieved age values for old metal-poor objects can be several Gyr younger than those resulting from isochrone fitting. We conclude that, depending on the parameter of interest and the accuracy requirements, fitting the largest possible wavelength range may not necessarily be the best strategy.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: spectroscopic - Galaxy: abundances - Galaxy: fundamental parameters - Galaxy: globular clusters: general - galaxies: stellar content

VizieR on-line data: <Available at CDS (J/MNRAS/499/2327): table1.dat rv.dat fitparam.dat>

Simbad objects: 93

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Number of rows : 93
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 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 330 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
6 NGC 361 OpC 01 02 11.11 -71 36 25.3 12.86 12.43 11.77   10.70 ~ 105 0
7 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
8 NGC 416 Cl* 01 07 59.03 -72 21 20.5 12.73 12.55 11.76   10.71 ~ 156 1
9 NGC 419 OpC 01 08 17.26 -72 53 01.8 11.41 11.16 10.50   9.34 ~ 287 0
10 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 131 0
11 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
12 NAME Fornax H4 GlC 02 40 07.697 -34 32 10.59   15.18 13.91 14.08   ~ 112 0
13 NAME Fornax H5 GlC 02 42 21.111 -34 06 05.80   14.5       ~ 101 0
14 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
15 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 579 0
16 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
17 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 273 0
18 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 231 0
19 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 298 1
20 NGC 1856 Cl* 05 09 30.290 -69 07 45.08   10.40 10.06     ~ 163 0
21 NGC 1866 GlC 05 13 38.920 -65 27 52.75           ~ 437 0
22 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
23 NGC 1868 GlC 05 14 36.60 -63 57 25.7           ~ 123 0
24 NGC 1898 As* 05 16 45.380 -69 39 16.76   12.62 11.86     ~ 104 0
25 NGC 1916 Cl* 05 18 37.87 -69 24 22.9   11.16 10.38     ~ 94 0
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
27 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
28 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 317 0
29 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
30 NGC 2009 Cl* 05 30 59 -69 11.1   11.29 11.02     ~ 17 0
31 NGC 2019 Cl* 05 31 56.48 -70 09 32.5   10.9 10.86     ~ 124 0
32 NGC 2100 Cl* 05 42 07.200 -69 12 26.99           ~ 195 0
33 NGC 2136 Cl* 05 53 01.800 -69 29 24.24   10.99 10.70     ~ 121 1
34 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
35 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
36 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
37 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
38 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
39 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
40 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
41 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
42 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
43 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
44 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 333 0
45 NGC 5694 GlC 14 39 36.52 -26 32 18.0           ~ 323 0
46 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
47 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
48 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 499 0
49 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
50 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
51 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
52 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 231 0
53 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
54 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
55 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
56 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
57 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 406 1
58 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 302 0
59 NGC 6293 GlC 17 10 10.42 -26 34 54.2           ~ 309 0
60 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 394 0
61 NGC 6316 GlC 17 16 37.42 -28 08 24.0   10.33 9.03     ~ 247 0
62 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0
63 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 310 0
64 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 372 1
65 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
66 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
67 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
68 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
69 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 592 0
70 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
71 NGC 6522 GlC 18 03 34.08 -30 02 02.3           ~ 569 0
72 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 561 0
73 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 409 0
74 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 644 0
75 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 276 0
76 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 317 0
77 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
78 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
79 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
80 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
81 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
82 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
83 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 273 0
84 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
85 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
86 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
87 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
88 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 394 0
89 NGC 6934 GlC 20 34 11.37 +07 24 16.1           ~ 459 0
90 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 562 0
91 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
92 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
93 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0

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