2016AJ....151....6S


Query : 2016AJ....151....6S

2016AJ....151....6S - Astron. J., 151, 6 (2016/January-0)

Properties of the open cluster Tombaugh 1 from high-resolution spectroscopy and uvbyCaHβ photometry.

SALES SILVA J.V., CARRARO G., ANTHONY-TWAROG B.J., MONI BIDIN C., COSTA E. and TWAROG B.A.

Abstract (from CDS):

Open clusters can be the key to deepening our knowledge on various issues involving the structure and evolution of the Galactic disk and details of stellar evolution because a cluster's properties are applicable to all its members. However, the number of open clusters with detailed analysis from high-resolution spectroscopy or precision photometry imposes severe limitations on studies of these objects. To expand the number of open clusters with well-defined chemical abundances and fundamental parameters, we investigate the poorly studied, anticenter open cluster Tombaugh 1. Using precision uvbyCaHβ photometry and high-resolution spectroscopy, we derive the cluster's reddening, obtain photometric metallicity estimates, and, for the first time, present a detailed abundance analysis of 10 potential cluster stars (nine clump stars and one Cepheid). Using the radial position from the cluster center and multiple color indices, we have isolated a sample of unevolved, probable single-star members of Tombaugh 1. From 51 stars, the cluster reddening is found to be E(b-y) = 0.221±0.006 or E(B-V) = 0.303±0.008, where the errors refer to the internal standard errors of the mean. The weighted photometric metallicity from m1 and hk is [Fe/H] = -0.10±0.02, while a match to the Victoria-Regina Strömgren isochrones leads to an age of 0.95±0.10 Gyr and an apparent modulus of (m - M) = 13.10±0.10. Radial velocities identify six giants as probable cluster members, and the elemental abundances of Fe, Na, Mg, Al, Si, Ca, Ti, Cr, Ni, Y, Ba, Ce, and Nd have been derived for both the cluster and the field stars. Tombaugh 1 appears to be a typical inner thin disk, intermediate-age open cluster of slightly subsolar metallicity, located just beyond the solar circle, with solar elemental abundance ratios except for the heavy s-process elements, which are a factor of two above solar. Its metallicity is consistent with a steep metallicity gradient in the galactocentric region between 9.5 and 12 kpc. Our study also shows that Cepheid XZ CMa is not a member of Tombaugh 1 and reveals that this Cepheid presents signs of barium enrichment, making it a probable binary star.

Abstract Copyright:

Journal keyword(s): open clusters and associations: general - open clusters and associations: individual: Tombaugh 1 - stars: abundances - stars: atmospheres

VizieR on-line data: <Available at CDS (J/AJ/151/6): table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat>

Nomenclature: Table 4: [SCA2016] NNNN N=10 among (Nos 395-1616).

Simbad objects: 73

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Number of rows : 73
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* FO Cas cC* 00 17 02.5025659440 +60 48 10.101619836   15.67 14.00     ~ 28 0
2 NGC 752 OpC 01 56 54 +37 47.6           ~ 608 0
3 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2928 0
4 V* EW Aur cC* 04 51 24.8479881912 +38 11 18.786824628   14.60       ~ 45 0
5 V* FF Aur cC* 04 55 18.1146521520 +39 58 46.982198784           ~ 37 0
6 Cl King 22 OpC 05 22 07 +45 26.5           ~ 66 0
7 Cl Berkeley 21 OpC 05 51 43 +21 48.7   12.26 11.1     ~ 111 0
8 M 37 OpC 05 52 18 +32 32.7   6.19 5.6     ~ 372 2
9 Cl Berkeley 22 OpC 05 58 28 +07 45.8           ~ 80 0
10 Cl Berkeley 73 OpC 06 22 05 -06 19.3           ~ 47 0
11 NGC 2251 OpC 06 34 43 +08 20.2   7.69 7.3     ~ 109 0
12 Cl Collinder 110 OpC 06 38 42 +02 04.1     10.5     ~ 63 1
13 Cl Berkeley 25 OpC 06 41 16 -16 29.2           ~ 56 0
14 NGC 2266 OpC 06 43 20 +26 58.6     9.5     ~ 73 0
15 M 41 OpC 06 46 00 -20 43.0   4.89 4.5     ~ 268 0
16 Cl Ruprecht 4 OpC 06 49 00 -10 31.4           ~ 41 0
17 Cl Berkeley 75 OpC 06 49 00 -23 59.9           ~ 56 0
18 V* EE Mon cC* 06 50 48.6825989856 -07 58 50.633343948   14.03 13.06   11.724 ~ 47 0
19 Cl Berkeley 33 OpC 06 57 49 -13 13.6           ~ 82 0
20 Cl Berkeley 32 OpC 06 58 07 +06 26.0           ~ 136 0
21 TYC 5971-1829-1 * 06 59 47.0012184600 -20 33 38.645848044   11.21 10.58     ~ 1 0
22 TYC 5971-2285-1 * 07 00 05.0852567952 -20 27 11.390726376   12.344 11.071     ~ 5 0
23 UCAC4 348-020412 * 07 00 05.6932915056 -20 35 20.466038904     13.72 13.50   ~ 1 0
24 BD-20 1666 * 07 00 06.0650469816 -20 36 44.079643800   9.72 9.45     A3 3 0
25 CSS 291 S* 07 00 13.6682576016 -20 33 29.596472640   12.07 10.37     S4*2 8 0
26 TYC 5975-1620-1 * 07 00 18.0161880432 -20 40 49.739314008   12.442 10.792     ~ 5 0
27 UCAC4 348-020482 * 07 00 18.7294094376 -20 31 30.946681488   15.24 14.06 13.81   ~ 1 0
28 CPD-20 1840 ** 07 00 23.0986600440 -20 26 50.482228668   10.79 10.36 10.45   ~ 1 0
29 UCAC4 348-020516 * 07 00 23.4014550096 -20 32 59.201030976   14.36 13.20 12.95   ~ 2 0
30 UCAC4 348-020523 * 07 00 24.1073467992 -20 35 45.120643404   15.37 14.16 13.99   ~ 1 0
31 V* XZ CMa cC* 07 00 24.8328266976 -20 25 54.132860604     13.01     ~ 32 0
32 Cl Haffner 1 OpC 07 00 30 -20 34.1           ~ 56 0
33 HD 52485B * 07 00 35.3161912392 -20 38 29.215236012   10.48 9.95     ~ 1 0
34 UCAC4 348-020631 * 07 00 36.1443970656 -20 35 47.070540132     13.60 13.38   ~ 1 0
35 UCAC4 347-020243 * 07 00 36.5269609176 -20 38 57.440726412     13.74 13.54   ~ 4 0
36 HD 52486 * 07 00 41.4325874760 -20 40 31.792592064   8.53 7.28     K1III 8 0
37 UCAC4 348-020683 * 07 00 46.3390166064 -20 28 55.707879252   15.40 14.16 13.96   ~ 1 0
38 TYC 5971-2681-1 * 07 00 47.7762755256 -20 29 30.234162912   11.48 11.05     ~ 1 0
39 UCAC4 348-020726 * 07 00 54.4609022328 -20 24 29.999388420     13.94 13.75   ~ 1 0
40 UCAC4 348-020742 * 07 00 58.0672426200 -20 33 24.609159072   14.77 13.68 13.55   ~ 1 0
41 TYC 5971-1449-1 * 07 01 02.5010138664 -20 24 41.301586224   10.33 10.37     ~ 1 0
42 TYC 5971-2699-1 * 07 01 07.1155655832 -20 33 50.721381396   12.30 10.40     ~ 1 0
43 Cl Haffner 2 OpC 07 03 06 -20 49.2           ~ 125 0
44 NGC 2335 OpC 07 06 46 -10 01.4   7.76 7.2     ~ 82 0
45 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 198 1
46 NGC 2420 OpC 07 38 24 +21 34.5   9.0 8.3     ~ 456 0
47 NGC 2447 OpC 07 44 34 -23 51.2           ~ 140 1
48 NGC 2477 OpC 07 52 11 -38 32.2   6.64 5.8     ~ 277 0
49 NGC 2482 OpC 07 55 09 -24 15.8   7.71 7.3     ~ 86 0
50 NGC 2516 OpC 07 58 06 -60 48.0           ~ 671 0
51 NGC 2506 OpC 08 00 02 -10 46.4   8.28 7.6     ~ 255 0
52 NGC 2527 OpC 08 04 59 -28 07.3   6.81 6.5     ~ 95 0
53 NGC 2539 OpC 08 10 38 -12 50.0   7.05 6.5     ~ 136 0
54 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2234 0
55 NGC 3114 OpC 10 02 13 -60 02.5   4.47 4.2     ~ 185 0
56 IC 2714 OpC 11 17 30 -62 43.1     8.2     ~ 90 0
57 NGC 3680 OpC 11 25 34 -43 14.4   8.40 7.6     ~ 309 0
58 NGC 4337 OpC 12 24 05 -58 07.5   9.44 8.9     ~ 43 0
59 Cl Collinder 261 OpC 12 38 05 -68 22.6     10.7     ~ 182 0
60 Cl Trumpler 20 OpC 12 39 32 -60 38.2           ~ 100 0
61 NGC 4815 OpC 12 58 00 -64 57.6   9.61 8.6     ~ 91 0
62 NGC 5822 OpC 15 04 12 -54 22.0           ~ 197 0
63 NGC 6087 OpC 16 18 53 -57 55.0           ~ 176 0
64 NGC 6192 OpC 16 40 18 -43 21.3           ~ 84 0
65 NGC 6404 OpC 17 39 40 -33 13.4     10.6     ~ 43 0
66 NGC 6583 OpC 18 15 51 -22 08.6     10.0     ~ 66 0
67 NGC 6603 OpC 18 18 28 -18 24.5     11.1     ~ 81 1
68 IC 4725 OpC 18 31 45 -19 06.8           ~ 213 0
69 NGC 6705 OpC 18 51 04 -06 16.3   6.32 5.8     ~ 398 0
70 NGC 6819 OpC 19 41 18 +40 11.4   8.21 7.3     ~ 569 0
71 NGC 7160 OpC 21 53 48 +62 35.3   6.34 6.1     ~ 231 0
72 NGC 7789 OpC 23 57 20 +56 43.6   7.68 6.7     ~ 497 0
73 NAME Ori Arm PoG ~ ~           ~ 196 0

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2023.02.06-08:48:55

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