2020A&A...639A..81B


Query : 2020A&A...639A..81B

2020A&A...639A..81B - Astronomy and Astrophysics, volume 639A, 81-81 (2020/7-1)

Variability of OB stars from TESS southern Sectors 1-13 and high-resolution IACOB and OWN spectroscopy.

BURSSENS S., SIMON-DIAZ S., BOWMAN D.M., HOLGADO G., MICHIELSEN M., DE BURGOS A., CASTRO N., BARBA R.H. and AERTS C.

Abstract (from CDS):


Context. The lack of high-precision long-term continuous photometric data for large samples of stars has impeded the large-scale exploration of pulsational variability in the OB star regime. As a result, the candidates for in-depth asteroseismic modelling have remained limited to a few dozen dwarfs. The TESS nominal space mission has surveyed the southern sky, including parts of the galactic plane, yielding continuous data across at least 27d for hundreds of OB stars.
Aims. We aim to couple TESS data in the southern sky with ground-based spectroscopy to study the variability in two dimensions, mass and evolution. We focus mainly on the presence of coherent pulsation modes that may or may not be present in the predicted theoretical instability domains and unravel all frequency behaviour in the amplitude spectra of the TESS data.
Methods. We compose a sample of 98 OB-type stars observed by TESS in Sectors 1-13 and with available multi-epoch, high-resolution spectroscopy gathered by the IACOB and OWN surveys. We present the short-cadence 2 min light curves of dozens of OB-type stars, which have one or more spectra in the IACOB or OWN database. Based on these light curves and their Lomb-Scargle periodograms, we performed variability classification and frequency analysis. We placed the stars in the spectroscopic Hertzsprung-Russell diagram to interpret the variability in an evolutionary context.
Results. We deduce the diverse origins of the mmag-level variability found in all of the 98 OB stars in the TESS data. We find among the sample several new variable stars, including three hybrid pulsators, three eclipsing binaries, high frequency modes in a Be star, and potential heat-driven pulsations in two Oe stars.
Conclusions. We identify stars for which future asteroseismic modelling is possible, provided mode identification is achieved. By comparing the position of the variables to theoretical instability strips, we discuss the current shortcomings in non-adiabatic pulsation theory and the distribution of pulsators in the upper Hertzsprung-Russell diagram.

Abstract Copyright: © ESO 2020

Journal keyword(s): techniques: photometric - techniques: spectroscopic - stars: massive - stars: oscillations

VizieR on-line data: <Available at CDS (J/A+A/639/A81): table2.dat tablea1.dat tablea2.dat>

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

Simbad objects: 115

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Number of rows : 115
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 * zet Scl SB* 00 02 19.9296342495 -29 43 13.597009065 4.29 4.879 5.022     B3/5V 126 0
2 * kap Cas s*b 00 32 59.9911963 +62 55 54.417374 3.50 4.30 4.16 4.02 3.96 B1Ia 452 0
3 * del Cet bC* 02 39 28.95579 +00 19 42.6345 2.97 3.85 4.07     B2IV 368 0
4 * u Tau SB* 03 45 40.4430080459 +06 02 59.988283002   5.225 5.337     B3V 125 0
5 * mu. Tau * 04 15 32.0568707393 +08 53 32.491567629 3.74 4.205 4.279     B3IV 140 0
6 * d Eri * 04 20 42.8342555227 -07 35 32.986684290 5.23 5.710 5.838     B7II 66 0
7 * lam Lep * 05 19 34.5240485 -13 10 36.440791 3.03 4.04 4.29 4.41 4.69 B0.5V 279 0
8 * gam Ori V* 05 25 07.86325 +06 20 58.9318 0.54 1.42 1.64 1.73 1.95 B2V 505 1
9 HD 35912 * 05 28 01.4701126086 +01 17 53.706832763 5.52 6.212 6.380     B2/3V 133 0
10 * ups Ori V* 05 31 55.8601879 -07 18 05.537157 3.30 4.36 4.63 4.75 5.01 O9.7V 387 0
11 * del Ori EB* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 752 0
12 HD 36959 Y*O 05 35 01.0063388388 -06 00 33.371107627 4.52 5.33 5.53     B1.2 195 0
13 HD 36960 * 05 35 02.6807398 -06 00 07.303539 3.52 4.50 4.72     B1/2Ib/II 248 0
14 * lam Ori A Em* 05 35 08.2792540686 +09 56 02.955355445 2.17 3.48 3.47     O8III((f)) 490 0
15 * tet01 Ori B EB* 05 35 16.1338018078 -05 23 06.780627482 7.71 8.20 7.96     B1V 351 2
16 * tet01 Ori C SB* 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1311 1
17 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1514 1
18 M 42 HII 05 35 17.3 -05 23 28           ~ 3818 0
19 * tet02 Ori A SB* 05 35 22.9022511214 -05 24 57.817182421 5.37 6.30 6.39 6.30 6.35 O9.5IVp 507 0
20 * c Ori Y*O 05 35 23.16427 -04 50 18.0881 3.46 4.40 4.59 4.67 4.85 B1V 199 0
21 * iot Ori SB* 05 35 25.9819073 -05 54 35.643537 1.45 2.53 2.77     O9IIIvar 739 0
22 * tet02 Ori B Y*O 05 35 26.4004225055 -05 25 00.792538337 5.36 6.29 6.38 6.29 11.050 B2-B5 182 0
23 HD 37061 Or* 05 35 31.3653515656 -05 16 02.586154009 6.44 7.09 6.83     O9V 330 0
24 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 868 0
25 HD 37209 ** 05 36 35.69332 -06 03 53.1086 4.61 5.50 5.72     B3IV 122 0
26 HD 37303 V* 05 37 27.3574991273 -05 56 18.197326622 4.93 5.817 6.024     B2V(n) 115 0
27 HD 37481 * 05 38 37.9736064998 -06 34 26.240626780 4.82 5.73 5.96     B2IV/V 118 0
28 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 760 0
29 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 410 0
30 * zet Ori A SB* 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 651 0
31 * 126 Tau ** 05 41 17.7176759 +16 32 02.925299 4.1 4.709 4.836     B3IV 158 0
32 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 466 0
33 * kap Ori s*b 05 47 45.3888404 -09 40 10.577707 0.87 1.88 2.06 2.09 2.27 B0.5Ia 551 0
34 HD 39680 Be* 05 54 44.7314236108 +13 51 17.068152340 7.05 8.01 7.99     O6V:[n]pevar 116 0
35 HD 39985 * 05 56 28.0340970088 +09 30 33.819020709   5.917 5.964     B9Ib 41 0
36 * mu. Ori SB* 06 02 22.99668 +09 38 50.1820 4.40 4.29 4.130 3.94 3.86 A1Vm+F2V 256 0
37 * nu. Ori SB* 06 07 34.3258759 +14 46 06.506096 3.6 4.240 4.397     B3V 224 0
38 HD 41997 * 06 08 55.8225631699 +15 42 18.192142635 8.16 9.47 9.13 8.83   O7.5Vn((f)) 89 0
39 HD 43112 * 06 15 08.4728118997 +13 51 03.970731479 4.7 5.676 5.894     B1V 111 0
40 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 692 0
41 HD 45314 Be* 06 27 15.7780829067 +14 53 21.219330074 5.91 6.79 6.64     O9:npe 158 0
42 HD 46056 Em* 06 31 20.8609777928 +04 50 03.842065994 7.60 8.36 8.16 8.16 8.09 O8Vn 210 0
43 NAME Rosette OB Association As* 06 31.7 +04 58           ~ 139 0
44 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 303 0
45 HD 46150 Em* 06 31 55.5205503719 +04 56 34.302522479 6.03 6.86 6.73 6.50 6.41 O5V((f))z 379 0
46 HD 46223 Y*O 06 32 09.3066083011 +04 49 24.707398183 6.73 7.50 7.28 6.95 6.79 O4V((f)) 361 0
47 HD 46485 Y*O 06 33 50.9569280058 +04 31 31.615740046 7.92 8.60 8.27   8.10 O7V((f))nzvar? 134 0
48 HD 46573 SB* 06 34 23.5693132208 +02 32 02.945820029 7.61 8.27 7.93     O7V((f))z 120 0
49 HD 46769 * 06 35 15.8292648574 +00 53 24.802111917 5.43 5.84 5.86 5.78 5.81 B7Ib-II 82 0
50 HD 47129 SB* 06 37 24.0417003671 +06 08 07.376246443 5.23 6.11 6.06     O8I+O7.5III 373 0
51 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.400 4.640   4.88 O7V+B1.5/2V 761 0
52 BD+10 1222 Y*O 06 41 00.0332978917 +09 52 17.874446998 9.42 9.82 9.88 9.932 9.929 A1V 40 0
53 HD 261938 Y*O 06 41 01.8782254007 +09 52 48.050098005 8.32 8.90 8.97 9.067 9.084 B3V 36 0
54 HD 261937 Y*O 06 41 04.5663038695 +09 54 43.857972507 10.918 10.71 10.36 10.115 9.857 kA2hA2mA5V 46 0
55 HD 48099 Be* 06 41 59.2307767004 +06 20 43.538696992 5.38 6.32 6.37 6.30 6.35 O5V((f))z+O9:V 283 0
56 HD 48279 ** 06 42 40.54719 +01 42 58.2571 7.26 8.03 7.86     O8V+F2V 142 0
57 HD 48434 * 06 43 38.6453955404 +03 55 57.114117401 4.99 5.88 5.90     B0II 149 0
58 * 16 Mon SB* 06 46 32.4144659902 +08 35 13.781782532   5.76 5.92     B3V 90 0
59 * 15 CMa bC* 06 53 32.9071871 -20 13 27.317715 3.66 4.62 4.83 4.95 5.17 B1Ib 198 0
60 * iot CMa bC* 06 56 08.2241266 -17 03 15.267468 3.62 4.297 4.385 6.40   B3Ib/II 163 1
61 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 467 1
62 * omi02 CMa s*b 07 03 01.4721150 -23 49 59.852308 2.14 2.94 3.02 3.01 3.10 B3Ia 308 0
63 * gam CMa * 07 03 45.4930485 -15 37 59.829971 3.52 4.00 4.12 4.13 4.23 B8II 173 0
64 HD 53975 SB* 07 06 35.9656022838 -12 23 38.216531612 5.38 6.40 6.50 6.51   O7.5Vz 183 0
65 HD 54662 SB* 07 09 20.2488124291 -10 20 47.627880802 5.35 6.24 6.21 7.23   O6.5Vz(n)+O7.5Vz 325 2
66 HD 54764 Pu* 07 09 33.3635217792 -16 14 04.227700397 5.320 6.120 6.080 7.42   B1Ib/II 74 0
67 HD 54879 SB* 07 10 08.1488998239 -11 48 09.835011060 6.8 7.60 7.65     O9.7V 71 0
68 HD 55879 * 07 14 28.2530122374 -10 18 58.483790697 4.88 5.85 6.03 7.35   O9.7III 158 0
69 * 29 CMa EB* 07 18 40.3796893709 -24 33 31.311819488 3.80 4.80 4.95 4.95 5.08 O7Iafpvar 401 0
70 * tau CMa EB* 07 18 42.4864191 -24 57 15.741299 3.26 4.25 4.40 4.44 4.62 O9II 402 0
71 HD 57236 * 07 19 30.1023461594 -22 00 17.278368696 8.21 8.90 8.80 9.41   O8.5V 55 1
72 HD 57539 Be* 07 21 34.6317872720 -05 53 49.897382573   6.473 6.585     B3IV 39 0
73 HD 57682 * 07 22 02.0544956184 -08 58 45.761168747 5.20 6.24 6.43     O9.2IV 236 0
74 HD 58978 Be* 07 26 59.4826767357 -23 05 09.683936209 4.51 5.45 5.56 7.05   B0.5IVe 216 0
75 V* PT Pup bC* 07 36 41.0358985359 -19 42 08.425242012 4.65 5.524 5.699     B2II 138 0
76 V* V390 Pup EB* 07 44 34.1691277332 -24 40 26.694355459   5.43 5.60     B2II 67 0
77 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1112 1
78 HD 74920 * 08 45 10.3407397959 -46 02 19.237276569 6.64 9.46 9.09 8.58   O7.5IVn((f)) 64 0
79 HD 75759 SB* 08 50 21.0168784693 -42 05 23.246151531 4.95 5.90 6.00 7.18   O9V+B0V 129 0
80 HD 76556 * 08 55 07.1450998466 -47 36 27.155801455 8.03 8.61 8.20 8.90   O6IV(n)((f))p 71 1
81 CD-47 4551 s*b 08 57 54.6180323134 -47 44 15.698082312 9.11 9.41 8.54 8.92   O5Ifc 69 0
82 HD 90273 * 10 23 44.4544231274 -57 38 31.535286472 8.35 9.25 9.05 9.58   ON7V((f)) 74 0
83 HD 93843 Er* 10 48 37.7714362588 -60 13 25.516378731 6.37 7.29 7.33 8.23   O5III(fc) 161 0
84 HD 303492 Em* 10 51 52.7493718750 -58 58 35.266002756 9.00 9.45 8.85 9.40   O8.5Iaf 55 0
85 HD 96715 * 11 07 32.8168866186 -59 57 48.703746695 7.51 8.32 8.28 9.04   O4V((f))z 108 0
86 HD 97253 SB* 11 10 42.0470936256 -60 23 04.112862713 6.42 7.24 7.09 8.08   O5III(f) 79 0
87 HD 101191 SB* 11 38 12.1659743817 -63 23 26.794409197 7.69 9.32 9.36 9.29   O8V 76 0
88 HD 101205 EB* 11 38 20.36114 -63 22 21.8889 5.64 6.53 6.54 7.41   B7/8Ib 150 0
89 HD 110360 * 12 42 12.7021049257 -60 39 08.704606517 8.69 9.79 9.58 9.77   ON7V 51 0
90 HD 112244 s*b 12 55 57.1346044550 -56 50 08.891958192 4.49 5.33 5.32 5.21 5.21 O8.5Iab(f)p 198 0
91 HD 123056 * 14 07 25.6377162147 -60 28 14.148538108 7.54 8.28 8.14 9.00   O9.5IV(n) 57 0
92 HD 135591 * 15 18 49.1429870266 -60 29 46.794326631 4.46 5.36 5.46 6.91   O8IV((f)) 150 0
93 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1757 2
94 HD 150574 * 16 44 07.2106897294 -46 08 29.843997832 8.01 8.74 8.50 9.30   ON9III(n) 59 0
95 HD 151804 s*b 16 51 33.7215112148 -41 13 49.928887100 4.45 5.29 5.22     O8Iaf 359 0
96 HD 152003 s*b 16 52 47.3741588958 -41 47 08.991515676 6.90 7.47 7.08 6.72 6.35 O9.7IabNwk 112 1
97 HD 152147 SB* 16 53 28.6177132113 -42 07 17.050796030 7.20 7.76 7.34 6.97 6.60 O9.7IbNwk 98 0
98 HD 152234 s*b 16 54 01.8374467 -41 48 23.007764 4.92 5.64 5.45     B0.5Ia 183 0
99 HD 152233 SB* 16 54 03.5915443398 -41 47 29.834880322 5.93 6.72 6.59     O6II(f) 183 0
100 CD-41 11027A Y*? 16 54 06.7181203726 -41 51 06.983144476 8.108 8.848 8.720   8.439 O9.7V 29 0
101 CD-41 11027B Y*? 16 54 06.8313446204 -41 51 01.371364489 9.412 10.049 9.898   9.600 ~ 6 0
102 HD 152247 SB* 16 54 11.5170221125 -41 38 30.969538639 6.62 7.35 7.16 8.09   O9.2III 118 0
103 HD 152249 s*b 16 54 11.6391931444 -41 50 57.294733186 5.91 6.65 6.45     OC9Iab 222 0
104 CD-41 11037 SB* 16 54 13.2251837411 -41 50 32.523158756 7.21 8.08 7.90     O9IV 71 0
105 HD 326331 ** 16 54 25.9691443778 -41 49 55.770189619 6.886 7.678 7.497   7.143 O8IVn((f)) 67 0
106 HD 152424 s*b 16 55 03.3297426438 -42 05 26.993062976 6.11 6.69 6.27 7.49   OC9.2Ia 185 0
107 V* V1297 Sco EB* 16 56 05.2156792717 -40 20 57.576409562 7.87 9.11 9.29 9.29   O7.5Vz 125 0
108 HD 154368 s*b 17 06 28.3687923960 -35 27 03.759955171 6.10 6.63 6.13 7.12   O9.5Iab 273 0
109 HD 154643 * 17 08 13.9816706301 -35 00 15.670543148 6.76 7.42 7.20 8.23   O9.7III 49 1
110 HD 155913 * 17 16 26.3329483283 -42 40 04.123131775 8.2 8.81 8.34 9.05   O4.5Vn((f)) 43 0
111 HD 156154 V* 17 17 27.0094090389 -35 32 12.005415836 8.19 8.64 8.04 8.94   O7.5Ib(f) 69 0
112 HD 156738 * 17 20 52.6585219138 -36 04 20.561546134 10.06 10.27 9.35 9.65   O6.5III(f) 69 0
113 HD 159176 SB* 17 34 42.4926595872 -32 34 53.964439199 4.88 5.74 5.70 7.19   O7V((f))+O7V((f)) 244 0
114 HD 188209 s*b 19 51 59.0685711923 +47 01 38.420250587 4.61 5.55 5.63 5.54 5.64 O9.5Iab 294 0
115 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 688 0

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2021.08.04-23:57:33

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