2008A&A...492..441N

Query : 2008A&A...492..441N

2008A&A...492..441N - Astronomy and Astrophysics, volume 492441-449 (2008/12-3)

Stellar tracers of the Cygnus Arm. II. A young open cluster in Cam OB3.

NEGUERUELA I. and MARCO A.

Abstract (from CDS):

Cam OB3 is the only defined OB association believed to belong to the outer Galactic arm or Cygnus arm. Very few members have been observed and the distance modulus to the association is not well known. We attempt a more complete description of the population of Cam OB3 and a better determination of its distance modulus. We present uvby photometry of the area surrounding the O-type stars BD +56°864 and LS I +57°138, finding a clear sequence of the early-type stars that define an uncatalogued open cluster, which we call Alicante 1. We also present spectroscopy of stars in this cluster and the surrounding association. From the spectral types for 18 very likely members of the association and UBV photometry found in the literature, we derive individual reddenings, finding a extinction law close to standard and an average distance modulus DM=13.0±0.4. This value is in excellent agreement with the distance modulus to the new cluster Alicante 1 found by fitting the photometric sequence to the ZAMS. In spite of the presence of several O-type stars, Alicante 1 is a very sparsely populated open cluster, with an almost total absence of early B-type stars. Our results definitely confirm that Cam OB3 is located on the Cygnus arm and identify the first open cluster known to belong to the association.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - stars: distances - Galaxy: structure - open clusters and associations: individual: Cam OB3 - stars: Hertzsprung-Russell (HR) and C-M diagrams - techniques: photometric

Nomenclature: Paragr.4.1: Cl Alicante N (No. 1). Table 7: Cl* Alicante 1 NM NNN N=38 among (Nos 44-695).

CDS comments: Wrong coordinates in table 7 for Cl* Alicante 1 NM 217 and Cl* Alicante 1 NM 254

Simbad objects: 71

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Number of rows : 71
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 Ass Per OB 1 As* 02 21 +57.6           ~ 181 1
2 Ass Cas OB 6 As* 02 43 +61.3           ~ 128 0
3 LS I +55 47 * 03 23 29.3747933016 +55 12 23.947263756 13.859 12.33 11.25     O9.5IV 15 0
4 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
5 EM* CDS 394 ** 03 54 32.841408 +56 50 49.94628 12.638 10.934   10.087   B4IIe 18 0
6 LS I +55 53 V* 03 55 15.7343118168 +55 30 18.248147532 12.67 12.60 11.68     B 14 0
7 LS I +55 54 * 03 56 33.1460655720 +55 47 12.048394092 11.99 12.47 11.82     B 16 0
8 LS I +57 136 * 03 56 40.9242516264 +57 15 28.651764852 12.191 11.24 10.88     B 20 0
9 LS I +56 94 * 03 57 31.5190958712 +57 01 54.049004832 11.51 12.06 11.77     OB- 10 0
10 LS I +56 90 * 03 57 43.8600013776 +56 27 29.013082920 12.52 12.84 12.24     B 11 0
11 BD+55 837 * 03 58 01.7263223856 +55 54 55.583154252 11.66 10.18 9.66     B1Ib: 31 0
12 TYC 3725-486-1 * 03 58 30.8310855432 +57 12 39.839027076   12.62 12.09     B9 5 0
13 Cl* Alicante 1 NM 44 a2* 03 58 31.3091562840 +57 18 16.167149568           ~ 4 0
14 Cl* Alicante 1 NM 635 * 03 58 34.6916336376 +57 08 01.154208444           ~ 1 0
15 Cl* Alicante 1 NM 396 * 03 58 34.6982602680 +57 12 22.243060116           ~ 1 0
16 Cl* Alicante 1 NM 610 * 03 58 35.7662046768 +57 08 23.478664164           ~ 1 0
17 Cl* Alicante 1 NM 439 * 03 58 44.9706084336 +57 11 29.540377140           ~ 2 0
18 Cl* Alicante 1 NM 62 * 03 58 45.3480217248 +57 17 52.448075844           ~ 1 0
19 LS I +57 137 * 03 58 46.5265803360 +57 10 43.488712200 12.619 11.4 11.2     B2p 19 0
20 Cl* Alicante 1 NM 264 * 03 58 49.3852414800 +57 14 17.152832256           ~ 2 0
21 Cl* Alicante 1 NM 351 * 03 58 49.6314116640 +57 12 49.164772212           ~ 1 0
22 Cl* Alicante 1 NM 444 * 03 58 53.6020525632 +57 11 19.227233904           ~ 2 0
23 Cl* Alicante 1 NM 230 * 03 58 54.9666399960 +57 14 51.719561268           ~ 1 0
24 Cl* Alicante 1 NM 119 * 03 58 57.7301439696 +57 16 53.033202696           ~ 2 0
25 Cl* Alicante 1 NM 89 * 03 58 57.7307322312 +57 17 31.573209948           ~ 1 0
26 Cl* Alicante 1 NM 280 * 03 59 03.0081148560 +57 14 04.130503332           ~ 2 0
27 Cl* Alicante 1 NM 321 * 03 59 05.7743240736 +57 13 22.340674920           ~ 1 0
28 Hilt 412 * 03 59 07.4899665432 +57 14 11.661837396 11.254 10.35 10.08     O8Vz 35 0
29 Cl Alicante 1 OpC 03 59 08 +57 14.4           ~ 18 0
30 Cl* Alicante 1 NM 251 * 03 59 09.6118162296 +57 14 26.157632172           ~ 2 0
31 Cl* Alicante 1 NM 254 * 03 59 09.70 +57 14 23.1           ~ 1 0
32 Cl* Alicante 1 NM 266 * 03 59 11.363 +57 14 10.45           ~ 1 0
33 Cl* Alicante 1 NM 222 * 03 59 11.6281037208 +57 14 54.703710600           ~ 1 0
34 Cl* Alicante 1 NM 281 * 03 59 11.8001396832 +57 14 02.056532568           ~ 2 0
35 Cl* Alicante 1 NM 302 * 03 59 11.8052295936 +57 13 39.637960284           ~ 2 0
36 Cl* Alicante 1 NM 278 * 03 59 12.7318357560 +57 14 04.021128960           ~ 1 0
37 Cl* Alicante 1 NM 649 * 03 59 14.1023117424 +57 07 37.470569916           ~ 2 0
38 Cl* Alicante 1 NM 223 * 03 59 14.2931218992 +57 14 54.123041652           ~ 2 0
39 Cl* Alicante 1 NM 83 * 03 59 14.8575613224 +57 17 32.388438516           ~ 1 0
40 Cl* Alicante 1 NM 245 * 03 59 14.9074637496 +57 14 33.720287460           ~ 2 0
41 Cl* Alicante 1 NM 297 * 03 59 15.2527974816 +57 13 42.046669956           ~ 2 0
42 Cl* Alicante 1 NM 609 * 03 59 15.9672235752 +57 08 18.424450644           ~ 2 0
43 Cl* Alicante 1 NM 304 * 03 59 16.4828856936 +57 13 36.024535272           ~ 2 0
44 Cl* Alicante 1 NM 570 * 03 59 17.3375966088 +57 08 52.857242484           ~ 1 0
45 Cl* Alicante 1 NM 289 * 03 59 18.2530636632 +57 13 49.678614264           ~ 2 0
46 BD+56 864 SB* 03 59 18.2933470368 +57 14 13.757279424 10.837 9.93 9.80     O5.5V(n)+O6.5V(n) 57 0
47 Cl* Alicante 1 NM 381 * 03 59 18.6642536400 +57 12 25.278281712           ~ 2 0
48 Cl* Alicante 1 NM 298 * 03 59 19.0599657192 +57 13 41.067899220           ~ 2 0
49 Cl* Alicante 1 NM 328 * 03 59 21.0326103192 +57 13 15.902057856           ~ 4 0
50 BD+56 866 * 03 59 28.8804779616 +57 07 04.788060096 11.613 10.55 10.44     O9V 39 0
51 Cl* Alicante 1 NM 217 * 03 59 40.62 +57 14 09.0           ~ 1 0
52 Cl* Alicante 1 NM 271 * 03 59 40.6836910296 +57 14 51.979690500           ~ 2 0
53 LS I +55 57 * 03 59 50.4354779664 +55 26 09.142542852 12.43 12.77 12.19     B 9 0
54 LS I +57 140 * 04 00 00.5687151576 +57 37 54.641027820 12.388 11.2 11.0     B 15 0
55 HD 237204 PN? 04 00 23.2815894096 +56 54 05.757564996 10.493 9.625 9.341 9.330   B2III: 48 0
56 BD+55 838 s*b 04 00 42.5910073584 +55 29 03.156416592 11.749 10.01 9.32     B3Ib 35 0
57 Ass Cam OB 3 As* 04 03 +56.7           ~ 27 0
58 HD 237211 s*b 04 03 15.6484849920 +56 32 24.874684872 10.579 9.41 9.05     O9.5Iab 49 0
59 HD 237213 s*b 04 04 24.5578033320 +56 00 19.465069860 11.19 9.39 8.74     B6Ia 47 0
60 HD 25914 s*b 04 09 23.2441416624 +57 05 28.256540388 8.31 8.56 8.07     B5Ia 53 0
61 Cl Waterloo 1 OpC 04 18 45.9 +52 51 55           ~ 85 0
62 HD 232947 s*b 04 25 24.5594670504 +53 24 55.143338904 9.56 9.85 9.33     B0Ia 33 0
63 LS V +56 59 SB* 04 27 56.6698565256 +56 26 51.291015612   11.19 10.92     B1V: 10 0
64 LS V +56 60 * 04 30 51.2979787128 +56 37 35.506726896   11.76 11.51     B2.5III 9 0
65 LBN 159.33+02.55 HII 04 56 05.5 +47 22 33           ~ 73 0
66 LBN 159.17+03.33 HII 04 58 45.7 +47 59 36           ~ 86 1
67 NGC 1893 OpC 05 22 52.8 +33 26 32           ~ 270 0
68 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
69 NAME Nor Arm PoG 16 00 -50.0           ~ 485 0
70 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
71 NAME Cyg Arm PoG 20 02 +40.0           ~ 163 0

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