2008MNRAS.387..308V

Query : 2008MNRAS.387..308V

2008MNRAS.387..308V - Mon. Not. R. Astron. Soc., 387, 308-318 (2008/June-2)

IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery.

VINK J.S., DREW J.E., STEEGHS D., WRIGHT N.J., MARTIN E.L., GANSICKE B.T., GREIMEL R. and DRAKE J.

Abstract (from CDS):

We report on the discovery of over 50 strong Hα emitting objects towards the large OB association Cyg OB2 and the HII region DR 15 on its southern periphery. This was achieved using the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS), combined with follow-up spectroscopy using the MMT multi-object spectrometer HectoSpec. We present optical spectra, supplemented with optical r',i' and Hα photometry from IPHAS, and near-infrared J,H and K photometry from Two Micron All Sky Survey. The position of the objects in the (J - H) versus (H - K) diagram strongly suggests most of them are young. Many show CaII infrared triplet emission indicating that they are in a pre-main-sequence phase of evolution of T Tauri and Herbig Ae nature. Among these, we have uncovered pronounced clustering of T Tauri stars roughly a degree south of the centre of Cyg OB2, in an arc close to the HII region DR 15, and the radio ring nebula G79.29+0.46, for which we discuss its candidacy as a luminous blue variable. The emission-line objects towards Cyg OB2 itself could be the brightest most prominent component of a population of lower mass pre-main-sequence stars that has yet to be uncovered. Finally, we discuss the nature of the ongoing star formation in Cyg OB2 and the possibility that the central OB stars have triggered star formation in the periphery.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): stars: early-type - stars: emission line, Be - stars: formation - stars: individual: T Tauri - stars: pre-main-sequence

Nomenclature: Table 2: [VDS2008] CNN (Nos C1-C10), [VDS2008] SNN (Nos S1-S38), [VDS2008] EaN (Nos Ea1, Eb1-Eb3, Ec1-Ec2).

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 HD 283447 Or* 04 14 12.9261150912 +28 12 12.359055168 13.17 12.07 10.68 9.45 8.67 K3Ve 445 0
2 V* DG Tau TT* 04 27 04.6921275888 +26 06 16.060169268 13.57 13.97 10.50 12.28   K6Ve 1092 1
3 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
4 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 649 0
5 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
6 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
7 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
10 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 561 0
11 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
12 UGPS J203017.09+401652.6 TT* 20 30 17.0909892144 +40 16 52.658379300           M3.5 1 0
13 2MASS J20304301+4050332 TT* 20 30 43.0163754144 +40 50 33.325167660           M5 1 0
14 2MASS J20310134+4042005 Y*? 20 31 01.3332530544 +40 42 00.479913984           ~ 2 0
15 2MASS J20310570+4128343 Y*? 20 31 05.7003413808 +41 28 34.417733592           ~ 2 0
16 2MASS J20311360+4020126 Y*? 20 31 13.6185212784 +40 20 12.745693752           ~ 2 0
17 2MASS J20311363+4127440 Em* 20 31 13.6306102392 +41 27 44.087921100           ~ 4 0
18 2MASS J20312316+4050247 Em* 20 31 23.16 +40 50 24.8           ~ 1 0
19 2MASS J20312476+4059441 Y*? 20 31 24.7656446016 +40 59 44.037273264           ~ 2 0
20 2MASS J20312586+4032316 Em* 20 31 25.8723956832 +40 32 31.498880568           ~ 1 0
21 2MASS J20313255+4051383 Em* 20 31 32.5593448176 +40 51 38.258699688           ~ 1 0
22 IRAS 20298+4011 LP? 20 31 42.2846664600 +40 21 59.074415640       15.384   B:I[e] 98 0
23 2MASS J20314662+4015425 TT* 20 31 46.6288259928 +40 15 42.582724452     19.25   16.14 K7 4 0
24 2MASS J20314903+4015378 TT* 20 31 49.0292882712 +40 15 37.893723192     20.48   16.78 M0.5 4 0
25 2MASS J20315028+4023329 Y*? 20 31 50.2826095896 +40 23 32.947902924           ~ 4 0
26 2MASS J20315166+4021285 Y*? 20 31 51.6697680648 +40 21 28.385914500           ~ 4 0
27 2MASS J20315533+4022166 Y*? 20 31 55.3293980688 +40 22 16.548472308     21.00   16.88 ~ 4 0
28 2MASS J20315907+4016479 TT* 20 31 59.0794843152 +40 16 47.907047496     18.62   16.43 M1 6 0
29 ZTF J203200.66+401621.9 RS* 20 32 00.6678972120 +40 16 21.904474404     19.27   16.54 M0.5 6 0
30 2MASS J20320094+4131137 Y*? 20 32 00.9325431984 +41 31 13.663775136           ~ 2 0
31 IPHAS J203206.86+403952.8 LP? 20 32 06.8621680320 +40 39 52.490088468           ~ 4 0
32 2MASS J20320782+4016363 TT* 20 32 07.8213914496 +40 16 36.266214396     21.27   17.53 M1.5 4 0
33 [RRJ2015] CAHA J203209.73+402253.4 Em* 20 32 09.7248531336 +40 22 53.314360032           ~ 2 0
34 2MASS J20321597+4010234 TT* 20 32 15.9782122968 +40 10 23.400362424           M0 3 0
35 2MASS J20321726+4102253 Em* 20 32 17.2678285968 +41 02 25.327548888           ~ 1 0
36 2MASS J20321950+4123377 Em* 20 32 19.4803296696 +41 23 37.576020264           ~ 1 0
37 2MASS J20322051+4017555 TT* 20 32 20.5094733240 +40 17 55.455808776     20.00   16.72 M0.5 2 0
38 2MASS J20322492+4125207 Y*? 20 32 24.9143387616 +41 25 20.821987704           ~ 2 0
39 [BNM96] 079.296+0.284 HII 20 32 27.9387239688 +40 16 07.617565056           ~ 32 0
40 2MASS J20322808+4140078 Y*? 20 32 28.0784885112 +41 40 07.710647736           ~ 2 0
41 2MASS J20322979+4015396 TT* 20 32 29.7981645168 +40 15 39.585036240     19.44   16.09 M2 3 0
42 18P 59 HII 20 32 31.2 +40 16 35           ~ 75 0
43 2MASS J20323272+4016318 TT* 20 32 32.7296830200 +40 16 31.813890708     18.12   15.56 K7 5 0
44 ZTF J203234.88+401810.9 RS* 20 32 34.8856874592 +40 18 10.872999576     17.99   15.42 K 7 0
45 [RRJ2015] CAHA J203235.82+401745.0 Em* 20 32 35.8246585080 +40 17 44.974010436           ~ 2 0
46 ZTF J203245.97+411042.2 LP* 20 32 45.9791421456 +41 10 42.332483388           ~ 4 0
47 2MASS J20324851+4021047 TT* 20 32 48.5142012096 +40 21 04.717256544           M0 8 0
48 2MASS J20325334+4048234 Y*? 20 32 53.3377755816 +40 48 23.436562248           Ae 5 0
49 2MASS J20325504+4016172 Y*? 20 32 55.0431164880 +40 16 17.212592928           K 7 0
50 2MASS J20325879+4132093 Y*? 20 32 58.7936406360 +41 32 09.368667276           ~ 5 0
51 2MASS J20330082+4018002 TT* 20 33 00.8204433360 +40 18 00.209933064           M0 9 0
52 2MASS J20330112+4014487 Y*? 20 33 01.13 +40 14 48.7           ~ 3 0
53 2MASS J20330608+4012116 TT* 20 33 06.0800132016 +40 12 11.666609460           M3.5 3 0
54 2MASS J20330980+4011545 Y*? 20 33 09.8102886264 +40 11 54.593861352           ~ 6 0
55 2MASS J20331017+4059035 Y*? 20 33 10.1779338048 +40 59 03.509089440           ~ 6 0
56 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
57 2MASS J20331489+4049096 Y*? 20 33 14.8921660680 +40 49 09.609588300           ~ 5 0
58 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 253 0
59 2MASS J20331717+4100153 Y*? 20 33 17.1898431312 +41 00 15.347245248           ~ 4 0
60 2MASS J20333684+4009387 TT* 20 33 36.8440121088 +40 09 38.790820476     19.70 18.30 16.24 M0.5 3 0
61 2MASS J20333955+4012025 Y*? 20 33 39.5583864576 +40 12 02.568723804     20.93 18.97 16.49 ~ 3 0
62 IPHAS J203347.69+402547.1 LP? 20 33 47.7070824936 +40 25 46.872438600           ~ 5 0
63 2MASS J20335344+4054489 TT* 20 33 53.4496146384 +40 54 48.880665612           M0.5 4 0
64 2MASS J20343253+4136411 Em* 20 34 32.5507591944 +41 36 41.289109128           ~ 1 0
65 2MASS J20383990+4201179 Y*? 20 38 39.9006103272 +42 01 17.866128756           ~ 5 0
66 2MASS J20405902+4110516 Em* 20 40 59.0213841000 +41 10 51.618621936           ~ 3 0
67 2MASS J20412101+4117212 Y*? 20 41 21.0131776728 +41 17 21.277055004           ~ 2 0
68 2MASS J20414006+4112279 Y*? 20 41 40.0654352832 +41 12 27.827368704           ~ 6 0
69 2MASS J20464548+4106596 Em* 20 46 45.4855287240 +41 06 59.647517640           ~ 3 0
70 2MASS J20473397+4131367 Em* 20 47 33.9684126792 +41 31 36.684845868           ~ 1 0
71 NAME Gould Belt PoG ~ ~           ~ 956 1

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