2018A&A...612A..50B


Query : 2018A&A...612A..50B

2018A&A...612A..50B - Astronomy and Astrophysics, volume 612A, 50-50 (2018/4-1)

New massive members of Cygnus OB2.

BERLANAS S.R., HERRERO A., COMERON F., PASQUALI A., BERTELLI MOTTA C. and SOTA A.

Abstract (from CDS):


Context. The Cygnus complex is one of the most powerful star forming regions at a close distance from the Sun (∼1.4kpc). Its richest OB association Cygnus OB2 is known to harbor many tens of O-type stars and hundreds of B-type stars, providing a large homogeneous population of OB stars that can be analyzed. Many studies of its massive population have been developed in the last decades, although the total number of OB stars is still incomplete.
Aims. Our aim is to increase the sample of O and B members of Cygnus OB2 and its surroundings by spectroscopically classifying 61 candidates as possible OB-type members of Cygnus OB2, using new intermediate resolution spectroscopy.
Methods. We have obtained intermediate resolution (R∼5000) spectra for all of the OB-type candidates between 2013 and 2017. We thus performed a spectral classification of the sample using HeI-II and metal lines rates, as well as the Marxist Ghost Buster (MGB) software for O-type stars and the IACOB standards catalog for B-type stars.
Results. From the whole sample of 61 candidates, we have classified 42 stars as new massive OB-type stars, earlier than B3, in Cygnus OB2 and surroundings, including 11 O-type stars. The other candidates are discarded as they display later spectral types inconsistent with membership in the association. We have also obtained visual extinctions for all the new confirmed massive OB members, placing them in a Hertzsprung-Russell Diagram using calibrations for Teff and luminosity. Finally, we have studied the age and extinction distribution of our sample within the region.
Conclusions. We have obtained new blue intermediate-resolution spectra suitable for spectral classification of 61 OB candidates in Cygnus OB2 and surroundings. The confirmation of 42 new OB massive stars (earlier than B3) in the region allows us to increase the young massive population known in the field. We have also confirmed the correlation between age and Galactic longitude previously found in the region. We conclude that many O and early B stars at B>16mag are still undiscovered in Cygnus.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: early-type - stars: massive - open clusters and associations: individual: Cygnus OB2 - Hertzsprung-Russell and C-M diagrams - Galaxy: stellar content

VizieR on-line data: <Available at CDS (J/A+A/612/A50): tablea1.dat tablea2.dat>

Simbad objects: 49

goto Full paper

goto View the references in ADS

Number of rows : 49
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 UCAC4 653-092194 * 20 18 10.8987915264 +40 29 06.298061748       13.18   O9.7Ib 2 0
2 HD 228973 * 20 20 07.3516437720 +41 07 46.715198808   10.36 9.61     B1V 7 0
3 TYC 3156-986-1 * 20 20 14.3487836160 +41 07 15.450805164   12.38 11.03     B1V 2 0
4 Ass Cyg OB 9 As* 20 21 +39.9           ~ 129 0
5 IRAS 20195+3926 * 20 21 19.2400366728 +39 36 22.997260296   12.71 11.41     B1Ib 2 0
6 ALS 19666 * 20 22 24.8207487864 +40 13 42.521856492 14.21 13.75 12.27     O8II 7 1
7 TYC 3156-1839-1 s*b 20 22 54.4988926152 +40 23 31.519867920   13.12 12.14     B0Iab 2 0
8 TYC 3156-1067-1 * 20 23 01.8318402840 +40 14 02.902943616   13.33 11.24     B1III 2 0
9 UCAC4 658-088590 * 20 23 02.9009033280 +41 33 46.599783696   15.44 13.17 12.51   B1V 2 0
10 LS II +39 46 * 20 23 38.1627204816 +39 38 11.841032508   11.32 10.78     B0.7Ib 8 0
11 HD 229258 * 20 24 25.5162951792 +39 49 28.312224744   10.264 9.840     B0.7V 16 0
12 BD+39 4179 Em* 20 25 27.2826202416 +40 24 00.125588088   11.08 10.10     B1Ib 11 0
13 TYC 3156-1422-1 s*b 20 25 33.1988631720 +40 48 44.432377200   13.07 11.59     B0Iab 3 0
14 UCAC4 650-089431 * 20 26 19.7599197312 +39 51 42.440990112   15.98 13.98 13.26   O8.5IV 2 0
15 UCAC4 651-091565 * 20 26 24.8851337136 +40 01 41.257013520   13.92 12.47 11.99   O9.2III 3 0
16 ATO J306.8374+41.3572 EB? 20 27 20.9962899456 +41 21 26.143711452   14.65 12.91 12.31   B0.5V 4 0
17 UCAC4 657-087297 * 20 27 37.8740501280 +41 15 46.799041680   15.56 13.37 12.67   B0II 3 0
18 UCAC4 652-090808 * 20 27 49.2528511152 +40 17 00.426791616   13.87 12.18 11.65   B1III 3 0
19 UCAC4 659-087265 * 20 27 52.9281893400 +41 44 06.718473924   13.99 12.11 11.57   O9.5II 4 0
20 [NH52] 52 * 20 28 11.7568121208 +38 40 22.710403560   11.83 10.97     B0Ib 4 0
21 UCAC4 663-091333 * 20 29 02.4694636320 +42 31 15.871666872   13.70 12.27 11.87   B1Ib 2 0
22 BD+40 4193 * 20 29 13.5548333424 +40 41 03.383452680   10.42 10.19     B1V 9 0
23 UCAC4 655-091925 * 20 29 16.1728788600 +40 57 37.190855016       12.69   O9.7III 5 0
24 TYC 3156-1881-1 * 20 29 35.6305449576 +40 24 31.445899056   12.49 11.64     O8IIIz 6 1
25 UCAC4 657-087591 * 20 30 10.9717809744 +41 20 08.822879916   16.68 14.45 13.61   B0:II: 3 0
26 BD+40 4208 * 20 30 49.9726448280 +40 44 18.511633716   10.68 10.08     B1V 15 0
27 UCAC4 656-090035 * 20 31 43.4091139680 +41 00 02.065181148   16.84 14.54 13.73   B1V 4 0
28 ATO J307.9763+40.1685 V* 20 31 54.3330553344 +40 10 06.704804496   16.62 14.31 13.63   B1III 4 0
29 RLP 961 * 20 31 58.9812323160 +41 07 31.379986560   16.34 14.23 13.50   B1V 6 0
30 NAME Cyg Complex reg 20 32 +45.0           ~ 571 0
31 HD 195873 ** 20 32 20.785200 +41 52 00.89904   9.18 8.80 9.05   B9V 12 0
32 RLP 984 * 20 32 38.8169038800 +40 58 46.726952268   16.56 14.35 13.31   B0Ib 5 0
33 UCAC4 655-092284 * 20 32 39.6781236648 +40 50 41.227263600   15.25 13.39 12.75   B0II 4 0
34 Schulte 41 SB* 20 32 59.6317342392 +41 15 14.679727632 16.54 15.59 13.49     O9.7III(n) 31 0
35 LS II +38 91 ** 20 33 04.5310890624 +38 22 26.896429992   11.41 10.73     B1V 7 0
36 RLP 107 SB* 20 33 05.2620969456 +41 43 36.748888104 14.9 14.43 12.94     B1V+B 22 0
37 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 887 0
38 LS II +37 97 s*b 20 33 35.5220929608 +38 01 36.705623448   11.82 10.54     B1Ia 10 0
39 Schulte 70 SB* 20 33 36.9940107864 +41 16 11.325832716 14.46 14.06 12.40     O9.5IV(n) 33 0
40 BD+42 3785a * 20 34 15.3905294424 +43 09 35.299748304   10.14 9.87     B9V 3 0
41 RLP 1252 * 20 34 57.8460419376 +41 43 54.274437444   16 13.2     O8III(f)e 8 0
42 UCAC4 663-091989 * 20 36 18.1189171920 +42 28 48.960570828   16.28 14.18 13.77   B0.7III 2 0
43 UCAC4 660-088892 * 20 37 17.7336404568 +41 56 31.568317044   16.89 14.14 13.34   O7V 2 0
44 UCAC4 655-092812 * 20 38 12.8886757896 +40 57 16.883343324   13.37 11.95 11.48   B2V 2 0
45 UCAC4 660-088958 * 20 38 21.7230169440 +41 57 06.836579712       13.20   O9.7II 2 0
46 BD+39 4263 * 20 38 28.8898283856 +40 09 56.623717980   10.02 9.66     B1III 10 0
47 UCAC4 662-089473 * 20 39 53.5834837368 +42 22 50.622585420   16.63   12.75   B0I 3 0
48 UCAC4 665-091077 Y*O 20 42 35.1664614480 +42 56 36.294067608   15.20 13.36 12.81   O6IIIz 4 1
49 UCAC4 656-091106 * 20 44 07.5142535160 +41 07 34.172718564   16.19 14.11 13.36   B1III 2 0

To bookmark this query, right click on this link: simbad:objects in 2018A&A...612A..50B and select 'bookmark this link' or equivalent in the popup menu


2022.12.04-17:01:35

© Université de Strasbourg/CNRS

    • Contact