2015ApJ...799..202M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST13:28:37

2015ApJ...799..202M - Astrophys. J., 799, 202 (2015/February-1)

The old, super-metal-rich open cluster, NGC 6791–Elemental abundances in turn-off stars from Keck/HIRES spectra.

MERCHANT BOESGAARD A., LUM M.G. and DELIYANNIS C.P.

Abstract (from CDS):

The study of star clusters has advanced our understanding of stellar evolution, Galactic chemical evolution, and nucleosynthesis. Here we investigate the composition of turn-off stars in the intriguing open cluster, NGC 6791, which is old, but super-metal-rich with high-resolution (R = 46,000) Keck/HIRES spectra. We find [Fe/H] = +0.30±0.02 from measurements of some 40 unblended, unsaturated lines of both Fe I and Fe II in eight turn-off stars. Our O abundances come from the O I triplet near 7774 Å and we perform a differential analysis relative to the Sun from our Lunar spectrum also obtained with Keck/HIRES. The O results are corrected for small nLTE effects. We find consistent ratios of [O/Fe]n with a mean of -0.06±0.02. This is low with respect to field stars that are also both old and metal-rich and continue the trend of decreasing [O/Fe] with increasing [Fe/H]. The small range in our oxygen abundances is consistent with a single population of stars. Our results for the alpha elements [Mg/Fe], [Si/Fe], [Ca/Fe], and [Ti/Fe] are near solar and compare well with those of the old, metal-rich field stars. The two Fe-peak elements, Cr and Ni, are consistent with Fe. These turn-off-star abundances provide benchmark abundances to investigate whether there are any observable abundance differences with the giants that might arise from nuclear-burning and dredge-up processes. Determinations of upper limits were found for Li by spectrum synthesis and are consistent with the upper limits in similar stars in the relatively old, super-metal-rich cluster NGC 6253. Our results support the prediction from standard theory that higher-metallicity stars deplete more Li. Probably no stars in NGC 6791 have retained their initial Li.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: NGC 6791 - stars: abundances - stars: evolution - stars: late-type - stars: Population II

Simbad objects: 76

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Number of rows : 76

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 1461 PM* 00 18 41.8673684261 -08 03 10.805762856   7.14 6.46     G3VFe0.5 310 1
2 NGC 188 OpC 00 48 26 +85 15.3           ~ 793 0
3 * 66 Cet B PM* 02 12 46.6412523732 -02 23 46.792715544   8.42 7.74     G1V 71 1
4 * 66 Cet SB* 02 12 47.5410114395 -02 23 37.066455992   6.23 5.68     F8V 118 1
5 HD 15069 PM* 02 28 20.7152250685 +62 13 08.443443139   8.40   7.4   G1V 30 0
6 V* AK For EB* 03 29 22.8751821925 -24 06 03.096791542   10.46 9.36     K3VkFe+0.4 34 0
7 HD 21727 ** 03 32 05.0971702026 +43 40 11.539266012       8.2   G9 58 0
8 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2581 0
9 HD 29528 PM* 04 39 36.5048100015 +13 07 23.146574100   9.79   8.4   K0 54 0
10 HD 33382 PM* 05 11 06.6871022850 +29 47 01.693636197   8.94 8.51     F5 4 0
11 HD 34634 PM* 05 21 49.3241361099 +51 29 10.490620366       7.3   F2 30 0
12 HD 45701 PM* 06 24 26.6023843750 -63 25 44.422321250   7.12 6.46     G1V 98 0
13 HD 47015 PM* 06 35 04.2640644107 -33 00 11.236833535   9.63 8.94     G5V 22 0
14 HD 47051 * 06 37 38.7694468550 +22 42 59.034863668   8.81 7.35     K2 4 0
15 HD 51219 PM* 06 56 34.1853326316 +01 09 43.504516044   8.11   6.9   G8V 87 0
16 HD 54468 * 07 08 07.3088253841 -18 46 34.766656422   9.18 9.16     A0V 4 0
17 HD 59468 PM* 07 27 25.4644171686 -51 24 09.358763608 7.689 7.428 6.714 6.33 5.976 G6.5V 102 0
18 * mu.02 Cnc PM* 08 07 45.8558112053 +21 34 54.532453099 6.14 5.93 5.30     G1IVb 208 0
19 HD 73393 PM* 08 40 42.1725962485 +55 40 03.847374444 8.910 8.690   7.6   G3V 52 0
20 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1983 0
21 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 944 1
22 HD 76151 PM* 08 54 17.9469808897 -05 26 04.046487788 6.89 6.67 6.00     G2V 462 0
23 HD 81748 * 09 27 07.7915482724 -17 15 56.535591290   9.75 9.19     (G)+A/F 6 0
24 HD 82265 * 09 31 20.1791591 +12 51 31.853797   7.97 6.90     K0 7 0
25 * 20 LMi PM* 10 01 00.6567799273 +31 55 25.216848499   6.02   4.9   G3VaHdel1 347 0
26 HD 94615 * 10 55 38.5229925024 +19 59 59.347560588   9.67 9.29     F5 2 0
27 * 83 Leo PM* 11 26 45.3217209044 +03 00 47.158549988 7.78 7.29   6.0   G9IV-V 202 0
28 HD 102081 * 11 45 01.4236449197 +19 30 00.446419176   8.76 8.50     A3 12 0
29 HD 102326 PM* 11 47 30.3467790711 +77 02 23.774708475   9.48   8.3   G8IV-V 33 0
30 HD 104304 PM* 12 00 44.4611593182 -10 26 46.055023587 6.76 6.32 5.55     G8IV 206 1
31 HD 108309 PM* 12 26 48.1415053432 -48 54 47.499036831   6.94 6.26     G2V 138 0
32 HD 110537 PM* 12 42 59.3251300046 -04 02 57.596129000   8.51 7.83     G6/8V 64 0
33 HD 110855 PM* 12 44 52.8538255144 +13 29 21.676187361   9.72   8.6   F8 30 0
34 HD 110885 * 12 45 19.2566519026 +01 03 21.097485519   9.76 9.12     F3V 47 0
35 HD 113712 PM* 13 05 29.6899522993 +16 05 43.367867538   9.49   8.4   G8V 26 0
36 HD 115968 SB* 13 20 01.5176823028 +38 09 33.208804694   8.74   7.6   G9V 42 0
37 HD 118742 ** 13 38 01.95361 +39 10 41.0960   8.68 7.91 8.42   G9 55 0
38 HD 122064 PM* 13 57 32.0591733968 +61 29 34.299358045 8.510 7.530   5.9   K3 89 0
39 HD 125072 PM* 14 19 04.8341367419 -59 22 44.535027477   7.69 6.66     K3IV 130 0
40 HD 127334 PM* 14 29 36.8091010490 +41 47 45.289229258 7.370 7.050   5.9   G5VCH0.3 148 0
41 V* DE Boo RS* 14 53 23.7667403 +19 09 10.081308   6.84   5.5   K0.5V 243 0
42 HD 132130 PM* 14 56 08.0124659507 +43 19 04.088306006   8.72 7.90     G0 30 0
43 HD 133600 PM* 15 05 13.2481747000 +06 17 23.691579336       7.8   G0 40 0
44 * 14 Her PM* 16 10 24.3152754550 +43 49 03.498734567   7.57   6.1   K0V 397 1
45 HD 150633 PM* 16 41 50.2244559621 +13 08 55.812646252   8.65   7.5   K0 29 0
46 HD 151504 PM* 16 48 32.2379044133 -19 17 15.963702282   8.87 8.09     G9IV-V 64 0
47 HD 153344 PM* 16 54 45.9767384138 +62 05 59.763658304   7.75   6.6   G5IV 52 0
48 NGC 6253 OpC 16 59 05 -52 42.0     10.2     ~ 141 0
49 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 455 2
50 NGC 6583 OpC 18 15 49 -22 08.0     10.0     ~ 43 0
51 HD 175518 SB* 18 55 52.9696677106 -05 44 42.793392871   8.21 7.46     G6IV/V 66 0
52 HD 177565 PM* 19 06 52.4643138830 -37 48 38.372801262   6.88 6.16     G6V 145 0
53 HD 230999 PM* 19 15 14.3476383493 +19 36 33.663009640   10.41 9.68     G5 28 0
54 Cl* NGC 6791 SBG 2130 * 19 20 31.47 +37 54 26.3   18.27 17.365     ~ 2 0
55 Cl* NGC 6791 SBG 4591 * 19 20 42.34 +37 49 18.7   18.292 17.439     ~ 2 0
56 Cl* NGC 6791 SBG 5744 * 19 20 46.08 +37 47 32.3   18.350 17.377     ~ 2 0
57 Cl* NGC 6791 SBG 7649 * 19 20 51.71 +37 46 57.0   18.333 17.428     ~ 2 0
58 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 840 0
59 [SLB2011b] 290.25912+37.84825 * 19 21 02.1836649268 +37 50 53.704086874     17.35   16.38 ~ 4 0
60 Cl* NGC 6791 SBG 12181 * 19 21 05.72 +37 50 45.6   18.305 17.400     ~ 2 0
61 Cl* NGC 6791 SBG 13334 * 19 21 10.37 +37 48 17.6   18.306 17.367     ~ 2 0
62 Cl* NGC 6791 SBG 13352 * 19 21 10.40 +37 45 22.6   18.298 17.435     ~ 2 0
63 Cl* NGC 6791 SBG 14416 * 19 21 16.28 +37 49 49.5   18.319 17.391     ~ 2 0
64 Cl* NGC 6791 SBG 15592 * 19 21 25.71 +37 46 53.3   18.29 17.425     ~ 2 0
65 HD 182488 PM* 19 23 34.0133626629 +33 13 19.074920892       5.8   K0V 235 1
66 * b Aql PM* 19 24 58.2002406780 +11 56 39.882312617 6.35 5.93   4.7   G7IVHdel1 447 0
67 * 16 Cyg A ** 19 41 48.9539315338 +50 31 30.218780803 6.79 6.59 5.95 5.50 5.17 G1.5Vb 664 1
68 * 16 Cyg B PM* 19 41 51.9731830550 +50 31 03.086127222 7.07 6.86 6.20 5.76 5.42 G3V 781 1
69 HD 190360 PM* 20 03 37.4049065078 +29 53 48.495330996   6.44   5.2   G7IV-V 380 1
70 * del Pav PM* 20 08 43.6094697 -66 10 55.443275 4.78 4.32 3.56 2.95 2.61 G8IV 343 0
71 HD 192310 PM* 20 15 17.3916558603 -27 01 58.713584596   6.63 5.723 5.98 8.74 K2+V 272 1
72 HD 197207 PM* 20 41 18.2591495824 +30 11 28.592765287   8.88   7.7   G5V 21 0
73 HD 205656 PM* 21 36 25.9592357164 +18 38 05.403870421       8.2   G5 35 0
74 * 51 Peg ** 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1058 1
75 HD 219134 Fl* 23 13 16.9747821012 +57 10 06.076520993 7.460 6.560 5.570 4.76 4.23 K3V 501 1
76 HD 219781 PM* 23 18 23.4472544006 +12 06 48.471635957       8.0   G5 20 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-13:28:37

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