2015A&A...580A...4C


Query : 2015A&A...580A...4C

2015A&A...580A...4C - Astronomy and Astrophysics, volume 580A, 4-4 (2015/8-1)

Insights into the properties of the Local (Orion) spiral arm. NGC 2302: First results and description of the program.

COSTA E., MOITINHO A., RADISZC M., MUNOZ R.R., CARRARO G., VAZQUEZ R.A. and SERVAJEAN E.

Abstract (from CDS):

The spiral structure of the Milky Way (MW) is highly uncertain and is the subject of much discussion nowadays. Even the spiral structure close to the Sun and the real nature of the so-called Local or Orion arm are poorly known. We present the first result from a program that determines the properties of the Local (Orion) spiral arm (LOA), together with a full description of the program. In this context we have made a comprehensive study of the young LOA open cluster NGC 2302, which includes a UBVRI photometric analysis and determination of its kinematic properties - proper motion (PM) and radial velocity (RV) - and of its orbital parameters. Making a geometric registration of our ad-hoc first- and second-epoch CCD frames (12-year timeframe), we determined the mean PM of NGC 2302 relative to the local field of disk stars, and, through a comparison with the UCAC4 catalog, we transformed this relative PM into an absolute one. Using medium-resolution spectroscopy of 26 stars in the field of NGC 2302, we derived its mean RV. We determined the cluster's structure, center, and radius by means of a density analysis of star counts. Photometric diagrams for several color combinations were built using our data, which allowed us to identify the stellar populations present in the field of NGC 2302 and to carry out our photometric membership analysis. Isochrone fits to the photometric diagrams allowed us to determine the fundamental parameters of NGC 2302, including reddening, distance, and age. The kinematic data and derived distance allowed us to determine the space motion of NGC 2302. This was done by adopting a time-independent, axisymmetric, and fully analytic gravitational potential for the MW. We obtained an absolute PM for NGC 2302 of (µα cos δ,µδ)=(-2.09,-2.11)mas/yr, with standard errors of 0.410 and 0.400mas/yr. The mean RV of NGC 2302 turned out to be 31.2km/s with a standard error of 0.7km/s. The density analysis revealed a remarkably spherical concentration of stars centered at α2000=06:51:51.820, δ2000=-07:05:10.68 with a radius of 2.5'. Although densely contaminated by field stars, all our photometric diagrams show a recognizable cluster sequence of bright stars (V≤18). The color-color diagrams show the existence of more than one population, each affected by distinct reddening with the cluster sequence at E(B-V)=0.23. Isochrone fits displaced for this reddening and for a distance modulus of (m-M)0=10.69 (distance, d=1.40 kpc) indicate an age of log(t)=7.90-8.00 with a slight tendency toward the younger age. Inspection of the shape of the orbit of NGC 2302 and the resulting orbital parameters indicate that it is a typical population I object.

Abstract Copyright:

Journal keyword(s): proper motions - open clusters and associations: general - open clusters and associations: individual: NGC 2302 - Galaxy: disk

VizieR on-line data: <Available at CDS (J/A+A/580/A4): table2.dat>

Simbad objects: 111

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Number of rows : 111
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 NAME Per Arm PoG 03 30 +45.0           ~ 1432 0
2 UCAC4 416-021453 * 06 51 35.0765290296 -06 59 34.945848996       15.38   ~ 1 0
3 UCAC4 415-021394 * 06 51 35.0768766096 -07 06 28.980388620     13.288 13.214   ~ 1 0
4 UCAC4 415-021400 * 06 51 35.7064085064 -07 02 29.626464048     15.910 15.580   ~ 1 0
5 UCAC4 415-021407 * 06 51 37.1935824096 -07 01 38.707141332     15.801 15.471   ~ 1 0
6 UCAC4 416-021466 * 06 51 37.7017484568 -06 59 36.471916356     13.127 12.940   ~ 1 0
7 UCAC4 415-021417 * 06 51 40.1502308904 -07 02 30.429532464       14.422   ~ 1 0
8 UCAC4 415-021418 * 06 51 40.1829473016 -07 04 08.971614084     14.520 14.379   ~ 1 0
9 UCAC4 415-021421 * 06 51 40.2901656384 -07 03 12.865673268   15.914 14.647 14.254   ~ 2 0
10 UCAC4 416-021477 * 06 51 40.3245869640 -06 57 45.354131676     15.412 15.084   ~ 1 0
11 UCAC4 415-021423 * 06 51 40.6555262856 -07 01 13.295171964     15.615 15.263   ~ 1 0
12 UCAC4 415-021425 * 06 51 40.9625215104 -07 06 10.760143968     14.630 14.301   ~ 1 0
13 UCAC4 415-021428 * 06 51 41.6626135344 -07 05 38.351390316     15.368 15.284   ~ 1 0
14 TYC 4812-193-1 * 06 51 42.1313313624 -07 05 09.106766988   10.92 10.883 10.985   ~ 2 0
15 TYC 4812-361-1 * 06 51 42.5385930648 -07 04 13.433428776   11.84 12.341 12.423   ~ 5 0
16 UCAC4 416-021500 * 06 51 44.2672721136 -06 59 55.404154932     13.511 13.366   ~ 4 0
17 UCAC4 415-021446 * 06 51 45.1320823320 -07 00 48.015061992     15.065 14.857   ~ 1 0
18 UCAC4 415-021447 * 06 51 45.1583737320 -07 07 12.628977564       14.635   ~ 1 0
19 UCAC4 416-021505 * 06 51 45.2209175712 -06 59 28.922036244     14.772 14.658   ~ 1 0
20 UCAC4 415-021452 * 06 51 46.1956625976 -07 04 36.158819916     15.046 14.899   ~ 1 0
21 UCAC4 415-021454 * 06 51 46.8225382944 -07 03 54.666311544     14.796 14.675   ~ 3 0
22 UCAC4 415-021457 * 06 51 47.2594431336 -07 05 05.638564248     15.805 15.586   ~ 1 0
23 TYC 4812-505-1 * 06 51 47.5061099016 -07 01 23.224163880   11.93 10.802 10.590   ~ 1 0
24 UCAC4 415-021460 * 06 51 47.9879134536 -07 06 54.725643612     16.407 16.150   ~ 1 0
25 UCAC4 415-021466 * 06 51 49.3396664664 -07 00 34.444714500     14.176 14.037   ~ 4 0
26 UCAC4 415-021467 * 06 51 49.6466618088 -07 07 16.511815524       14.727   ~ 1 0
27 UCAC4 416-021524 * 06 51 50.0796 -06 58 57.461     14.223 14.924   ~ 1 0
28 UCAC4 415-021471 * 06 51 50.2944187320 -07 06 03.121272756     12.768 12.823   ~ 3 0
29 TYC 4812-514-1 * 06 51 50.7409764024 -07 04 48.942237972   10.34 10.19 10.386   ~ 2 0
30 UCAC4 415-021476 * 06 51 51.3747433152 -07 07 25.876438968     14.359 14.184   ~ 3 0
31 UCAC4 415-021482 * 06 51 52.2314410920 -07 03 29.459566116     14.108 13.734   ~ 1 0
32 UCAC4 415-021488 * 06 51 52.5110637216 -07 00 56.115764172     14.558 14.300   ~ 1 0
33 BD-06 1780 * 06 51 52.8432228288 -07 04 15.907700028   10.33 10.793 10.878   ~ 5 0
34 UCAC4 415-021490 * 06 51 53.2048046832 -07 06 53.611222500     15.488 14.984   ~ 1 0
35 TYC 4812-1032-1 * 06 51 54.0828374040 -07 06 04.341044124   12.05 11.896 11.947   ~ 4 0
36 UCAC4 415-021498 * 06 51 54.4112990904 -07 05 28.559221368     13.176 14.626   ~ 3 0
37 NGC 2302 OpC 06 51 54 -07 05.2           ~ 51 0
38 UCAC4 415-021500 * 06 51 54.5263625088 -07 05 22.560320220     12.605 12.803   ~ 3 0
39 UCAC4 415-021503 * 06 51 55.1004734232 -07 03 27.499972248     13.596 13.458   ~ 1 0
40 UCAC4 415-021504 * 06 51 55.1282832096 -07 04 28.632980280       14.677   ~ 1 0
41 TYC 4812-997-1 * 06 51 55.4021193792 -07 04 37.735168008   11.53 11.628 11.691   ~ 4 0
42 UCAC4 415-021516 * 06 51 56.5787103600 -07 02 24.074941704     15.588 15.213   ~ 1 0
43 UCAC4 415-021517 * 06 51 56.6138166648 -07 01 38.797559184     14.272 13.977   ~ 1 0
44 UCAC4 416-021567 * 06 51 57.1482170496 -06 57 20.131873164       15.625   ~ 1 0
45 UCAC4 415-021520 * 06 51 57.1592604360 -07 06 15.434908992     14.559 14.298   ~ 3 0
46 UCAC4 415-021522 * 06 51 57.3036679248 -07 04 01.334655012     14.467 14.025   ~ 1 0
47 TYC 4812-847-1 * 06 51 57.4098064848 -07 01 08.387210784   11.31 11.311 11.351   ~ 3 0
48 TYC 4812-904-1 * 06 51 57.6449332680 -07 05 27.687903612   11.76 11.666 11.807   ~ 4 0
49 UCAC4 416-021573 * 06 51 58.1839177344 -06 58 05.518081704     15.402 14.988   ~ 1 0
50 UCAC4 415-021535 * 06 51 58.4038159032 -07 07 44.137636788     14.378 14.251   ~ 3 0
51 UCAC4 415-021539 * 06 51 58.7862195768 -07 06 24.790840884       13.519   ~ 3 0
52 UCAC4 415-021540 * 06 51 59.1968187912 -07 06 21.743048412       14.451   ~ 1 0
53 UCAC4 415-021547 * 06 52 00.2514005472 -07 03 37.246356936     13.963 13.506   ~ 1 0
54 UCAC4 415-021550 * 06 52 00.7586916840 -07 00 59.740698996     12.897 12.574   ~ 1 0
55 UCAC4 416-021604 * 06 52 03.1859195136 -06 58 03.813077172     15.107 14.753   ~ 1 0
56 TYC 4812-499-1 * 06 52 03.4698028296 -07 04 25.528074564   12.50 11.67 11.806   ~ 1 0
57 UCAC4 415-021569 * 06 52 03.9656112936 -07 02 18.407643252     15.200 14.950   ~ 3 0
58 UCAC4 415-021571 * 06 52 04.0458513288 -07 07 25.162006368     15.509 15.230   ~ 2 0
59 UCAC4 415-021572 * 06 52 04.3329518184 -07 04 57.400593636       13.611   ~ 1 0
60 UCAC4 415-021573 * 06 52 05.2884481392 -07 00 02.362539852     14.430 14.274   ~ 1 0
61 UCAC4 415-021576 * 06 52 05.9464204272 -07 01 04.098253152     15.811 15.704   ~ 1 0
62 UCAC4 415-021582 * 06 52 07.0469557152 -07 02 44.892030336     15.446 15.247   ~ 1 0
63 V* EH Mon EB* 06 52 08.7658010808 -07 03 52.971874884     13.334 13.028   ~ 11 0
64 UCAC4 415-021599 * 06 52 09.6671404608 -07 01 33.879519876     13.685 13.590   ~ 1 0
65 UCAC4 416-021642 * 06 52 09.7884904008 -06 57 59.172322680     15.381 15.137   ~ 1 0
66 UCAC4 415-021606 * 06 52 11.9839772328 -07 04 47.933048748     15.860 15.385   ~ 1 0
67 UCAC4 415-021610 PM* 06 52 12.9239259552 -07 07 49.153514916     15.940 15.691   ~ 1 0
68 UCAC4 415-021611 * 06 52 13.5487118304 -07 07 23.552949036     12.700 12.305   ~ 1 0
69 UCAC4 416-021650 * 06 52 13.5839231376 -06 59 10.701472668     15.953 15.715   ~ 1 0
70 UCAC4 415-021613 * 06 52 14.3363056296 -07 05 54.263398380     13.024 12.816   ~ 1 0
71 UCAC4 415-021614 * 06 52 15.0083 -07 06 48.060     14.177 14.263   ~ 1 0
72 UCAC4 416-021656 * 06 52 15.1345322880 -06 58 07.527276696     16.136 16.000   ~ 1 0
73 UCAC4 415-021625 * 06 52 17.1062265240 -07 03 56.774702916     14.130 13.735   ~ 1 0
74 UCAC4 415-021633 * 06 52 18.7013579232 -07 08 07.043872776     15.171 15.386   ~ 1 0
75 2MASS J06521888-0702435 * 06 52 18.8833755192 -07 02 43.523289204           ~ 1 0
76 UCAC4 415-021634 * 06 52 18.9637777968 -07 06 54.225809748       15.679   ~ 1 0
77 NGC 2309 OpC 06 56.1 -07 11           ~ 25 0
78 NGC 2311 OpC 06 57 47.3 -04 36 36     9.6     ~ 40 0
79 NGC 2335 OpC 07 06 46 -10 01.4   7.76 7.2     ~ 82 0
80 NGC 2343 OpC 07 08 07 -10 37.1   7.05 6.7     ~ 78 0
81 NGC 2353 OpC 07 14 34 -10 15.4   7.30 7.1     ~ 96 0
82 NGC 2367 OpC 07 20 07 -21 52.0           ~ 69 0
83 Cl Ruprecht 18 OpC 07 24 38 -26 12.8   9.90 9.4     ~ 47 0
84 NGC 2383 OpC 07 24 42 -20 56.9   8.88 8.4     ~ 68 0
85 NGC 2384 OpC 07 25 10 -21 01.3   7.47 7.4     ~ 73 0
86 Cl Czernik 29 OpC 07 28 24 -15 23.1   10.81 10.3     ~ 24 0
87 Cl Haffner 10 OpC 07 28 37 -15 21.8   12.60 11.5     ~ 35 0
88 NGC 2401 OpC 07 29 24 -13 58.1     12.6     ~ 25 0
89 NGC 2414 OpC 07 33 10 -15 26.9   8.33 7.9     ~ 77 0
90 NGC 2425 OpC 07 38 18 -14 53.1           ~ 45 0
91 NAME Puppis reg 07 40 -28.0           ~ 87 0
92 NGC 2439 OpC 07 40 47 -31 41.6   7.31 6.9     ~ 139 0
93 NGC 2432 OpC 07 40 54 -19 04.7     10.2     ~ 36 0
94 NGC 2453 OpC 07 47 35 -27 11.6   8.39 8.3     ~ 60 0
95 Cl Haffner 16 OpC 07 50 21 -25 27.5   10.14 10.0     ~ 50 0
96 Cl Haffner 18 OpC 07 52 40 -26 23.2   10.09 9.3     ~ 52 1
97 Cl Haffner 19 OpC 07 52 46 -26 16.4           ~ 56 0
98 NGC 2533 OpC 08 07 06 -29 52.3   8.19 7.6     ~ 60 0
99 Cl Ruprecht 55 OpC 08 12 27 -32 35.0   8.14 7.8     ~ 51 1
100 NGC 2571 OpC 08 18 54 -29 46.5   7.16 7.0     ~ 74 0
101 NGC 2588 OpC 08 23 11 -32 58.3     11.8     ~ 20 0
102 NGC 2635 OpC 08 38 29 -34 46.6   12.06 11.2     ~ 34 0
103 C 0850-374 OpC 08 52 03 -37 36.6           ~ 7 0
104 Cl Ruprecht 158 OpC 08 52 26 -37 33.3           ~ 10 0
105 NAME Sgr Arm PoG 19 00 -30.0           ~ 609 1
106 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 987 0
107 W 51 SNR 19 23 50 +14 06.0           ~ 1242 1
108 NAME Outer Arm PoG 21 48 +69.4           ~ 288 0
109 NAME Vela Field reg ~ ~           ~ 168 0
110 NAME Local Arm reg ~ ~           ~ 486 0
111 NAME Ori Arm PoG ~ ~           ~ 196 0

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2023.02.01-08:07:56

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