2020A&A...642A.168B


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.25CEST02:13:50

2020A&A...642A.168B - Astronomy and Astrophysics, volume 642A, 168-168 (2020/10-1)

Spectroscopic characterization of the known O-star population in Cygnus OB2. Evidence of multiple star-forming bursts.

BERLANAS S.R., HERRERO A., COMERON F., SIMON-DIAZ S., LENNON D.J., PASQUALI A., MAIZ APELLANIZ J., SOTA A. and PELLERIN A.

Abstract (from CDS):


Context. Cygnus OB2 provides a unique insight into the high-mass stellar content in one of the largest groups of young massive stars in our Galaxy. Although several studies of its massive population have been carried out over the last decades, an extensive spectroscopic study of the whole known O-star population in the association is still lacking.
Aims. We aim to carry out a spectroscopic characterization of all the currently known O stars in Cygnus OB2, determining the distribution of rotational velocities and accurate stellar parameters to obtain an improved view of the evolutionary status of the region.
Methods. Based on existing and new optical spectroscopy, we performed a detailed quantitative spectroscopic analysis of all the known O-type stars identified in the association. For this purpose, we used the user-friendly iacob-broad and iacob-gbat automatized tools, FASTWIND stellar models, and astrometry provided by the Gaia second data release.
Results. We created the most complete spectroscopic census of O stars carried out so far in Cygnus OB2 using already existing and new spectroscopy. We present the spectra for 78 O-type stars, from which we identify new binary systems, obtain the distribution of rotational velocities, and determine the main stellar parameters for all the stars in the region that have not been detected as double-line spectroscopic binaries. We also derive radii, luminosities, and masses for those stars with reliable Gaia astrometry, in addition to creating the Hertzsprung-Russell Diagram to interpret the evolutionary status of the association. Finally, we inspect the dynamical state of the population and identify runaway candidates.
Conclusions. Our spectroscopic analysis of the O-star population in Cygnus OB2 has led to the discovery of two new binary systems and the determination of the main stellar parameters, including rotational velocities, luminosities, masses, and radii for all identified stars. This work has shown the improvement reached when using accurate spectroscopic parameters and astrometry for the interpretation of the evolutionary status of a population, revealing, in the case of Cygnus OB2, at least two star-forming bursts at ∼3 and ∼5Myr. We find an apparent deficit of very fast rotators in the distribution of rotational velocities. The inspection of the dynamical distribution of the sample has allowed us to identify nine O stars with peculiar proper motions and discuss a possible dynamical ejection scenario or past supernova explosions in the region.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: early-type - stars: massive - stars: fundamental parameters - Hertzsprung-Russell and C-M diagrams - open clusters and associations: individual: Cygnus OB2 - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/642/A168): tablea1.dat tablea2.dat tablea3.dat tablea4.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 59

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Number of rows : 59

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15440 1
2 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1802 1
3 TYC 3160-279-1 * 20 27 24.2819048143 +41 15 45.782710757   12.64 11.76     O9.5V 5 0
4 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 659 1
5 BD+40 4193 * 20 29 13.5551194391 +40 41 03.371233373   10.42 10.19     B1V 8 0
6 UCAC4 655-091925 * 20 29 16.1730455804 +40 57 37.191861189       12.69   O9.7III 4 0
7 2MASS J20301838+4053466 * 20 30 18.3937815335 +40 53 46.559684920           O9V 3 0
8 [CPR2002] B17 s*b 20 30 27.3017352150 +41 13 25.127848580     13.053     O6Iaf+O9Ia 27 0
9 2MASS J20303832+4010537 * 20 30 38.3296795939 +40 10 53.839713080           B1V 3 0
10 GSC 03161-01264 * 20 30 39.7995745930 +41 36 50.686011552 15.11 14.57 12.93     O6.5V 21 0
11 BD+40 4208 * 20 30 49.9721983825 +40 44 18.500864255   10.68 10.08     B1V 14 0
12 [CPR2002] A26 * 20 30 57.7236965083 +41 09 57.520925144           O9V 8 0
13 TYC 3157-776-1 * 20 31 00.2043291474 +40 49 49.690193391   12.10 11.22     O7V((f)) 12 0
14 Schulte 1 SB* 20 31 10.544472 +41 31 53.52024 12.82 12.69 11.09 10.57   O9V 57 0
15 RLP 1592 SB* 20 31 18.3293552763 +41 21 21.702839806 15.88 15.09 12.99     O9.5V 21 0
16 2MASS J20313364+4136046 * 20 31 33.6407576529 +41 36 04.666103451   15.89 14.60     B3V 8 0
17 [CPR2002] A15 * 20 31 36.9100089636 +40 59 09.032344546           O7Ib(f) 9 0
18 BD+40 4212 SB* 20 31 37.5055016113 +41 13 20.999123545 12.46 11.5 10.214     O8.5Ib(f) 71 1
19 Schulte 20 SB* 20 31 49.6576546015 +41 28 26.509108646 12.67 12.63 11.52     O9III 39 0
20 [MT91] 213 Be* 20 32 13.1248987067 +41 27 24.343749507 13.12 13.08 11.266     B0Vp 228 0
21 BD+40 4220 SB* 20 32 22.4241357648 +41 18 18.942382590 11.32 10.79 9.185     O6.5:Iafe 375 0
22 2MASS J20322615+4057194 NIR 20 32 26.15160 +40 57 19.4760           ~ 1 0
23 [CPR2002] A39 * 20 32 27.3405983131 +40 55 18.245328532           B2V 12 0
24 Schulte 15 SB* 20 32 27.6544818172 +41 26 22.072017651 12.39 12.30 11.10     O8V 47 0
25 [CPR2002] A32 * 20 32 30.3114658567 +40 34 33.236961973           O9.5IV 10 0
26 [CPR2002] A11 SB* 20 32 31.5335925285 +41 14 08.189588225           O7Ib(f) 23 0
27 Schulte 17 SB* 20 32 50.0161486662 +41 23 44.683851258 13.15 12.43 11.33     O8V 39 0
28 Schulte 37 * 20 32 54.4028514021 +41 15 21.869780359 17.76 16.97 14.81     B3V 13 0
29 GSC 03161-01218 * 20 32 59.1773700777 +41 24 25.490197754 13.47 13.26 11.91     O8V 28 0
30 RLP 666 SB* 20 33 02.9132456764 +41 17 43.158212333 15.67 15.06 12.94 12.18   O8V 28 0
31 [CPR2002] A20 * 20 33 02.9230028436 +40 47 25.326758463           O8II((f)) 16 0
32 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 65 0
33 Schulte 22B SB* 20 33 08.8434068322 +41 13 17.226918757           O6V((f)) 16 0
34 Schulte 50 SB* 20 33 09.60288 +41 13 00.5520 15.52 14.82 12.86 12.32   O9.5IIIn 31 0
35 ALS 15190 * 20 33 10.2850586168 +41 23 44.599922440 16.67 16.36 14.97     B4II-III 11 0
36 Schulte 9 s*b 20 33 10.7366753544 +41 15 08.222187463 13.38 12.77 10.96     O4.5If 212 0
37 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 827 0
38 RLP 853 SB* 20 33 13.2614932718 +41 13 28.656893298 16.63 15.76 13.61     O6V 30 0
39 GSC 03157-00872 * 20 33 13.6906419627 +41 13 05.768523185 15.27 14.73 12.92     O8V 27 0
40 Schulte 7 * 20 33 14.1095790591 +41 20 21.903381641 12.24 12.00 10.55     O3If* 133 0
41 BD+40 4227A SB* 20 33 15.0780900764 +41 18 50.478859468 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 220 0
42 Schulte 23 * 20 33 15.7083043245 +41 20 17.170989464 14.21 14.07 12.61     O9V 31 0
43 Schulte 8D SB* 20 33 16.3365587331 +41 19 01.881694182 13.66 13.47 12.02     O8.5V(n) 38 0
44 RLP 680 SB* 20 33 18.0349556587 +41 21 36.654070692 13.9 12.72 11.82     O8V 32 0
45 RLP 841 ** 20 33 23.472072 +41 09 12.90312 14.97 14.23 11.83 10.98   O6IV((f)) 36 0
46 Schulte 74 SB* 20 33 30.3175678830 +41 35 57.880022232 15.04 14.41 12.51     O8V 24 0
47 Schulte 70 SB* 20 33 36.9940352872 +41 16 11.325289558 14.46 14.06 12.40     O9.5IV(n) 31 0
48 EM* AS 428 SB* 20 33 39.7956855958 +41 22 52.189285967 13.17 12.21 11.38     B0.5V 33 0
49 BD+41 3804 s*b 20 33 46.1097446575 +41 33 00.958715569 11.82 11.41 9.88     O9.7Iab 94 0
50 Schulte 27 SB* 20 33 59.5273209521 +41 17 35.483379508 14.44 13.97 12.203     O9.7V(n)+O9.7V(n) 45 0
51 RLP 814 EB* 20 34 06.0156530592 +41 08 09.128736588 16.37 15.64 13.415     B0V 25 0
52 BD+41 3807 SB* 20 34 08.5147839926 +41 36 59.407506888 11.74 11.52 10.03     O5.5Ifc 114 0
53 Schulte 29 SB* 20 34 13.5109582260 +41 35 02.858127404 13.59 13.41 11.91     O7.5V(n)((f))z 36 0
54 Schulte 73 SB* 20 34 21.9322175174 +41 17 01.659157635   14.13 12.40     O8Vz+O8Vz 26 0
55 RLP 335 SB* 20 34 29.5986227178 +41 31 45.516284010 14.72 13.30 11.64     O7.5V(n)((f)) 39 0
56 Schulte 30 Em* 20 34 43.5997987312 +41 29 04.795755945 14.13 13.83 12.240     B1.5III 29 0
57 [CPR2002] A29 * 20 34 56.0575743877 +40 38 17.940209583           O9.7Iab 9 0
58 RLP 357 EB* 20 34 58.7803708668 +41 36 17.360548402   12.81 11.418     B0Ib 24 0
59 [CPR2002] A37 * 20 36 04.4995821629 +40 56 13.037685329           O5V((f)) 20 0

    Equat.    Gal    SGal    Ecl

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2021.06.25-02:13:50

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