2020ApJ...902...24D


Query : 2020ApJ...902...24D

2020ApJ...902...24D - Astrophys. J., 902, 24-24 (2020/October-2)

Short-term variability of evolved massive stars with TESS. II. A new class of cool, pulsating supergiants.

DORN-WALLENSTEIN T.Z., LEVESQUE E.M., NEUGENT K.F., DAVENPORT J.R.A., MORRIS B.M. and GOOTKIN K.

Abstract (from CDS):

Massive stars briefly pass through the yellow supergiant (YSG) phase as they evolve redward across the H-R diagram and expand into red supergiants (RSGs). Higher-mass stars pass through the YSG phase again as they evolve blueward after experiencing significant RSG mass loss. These post-RSG objects offer us a tantalizing glimpse into which stars end their lives as RSGs and why. One telltale sign of a post-RSG object may be an instability to pulsations, depending on the star's interior structure. Here we report the discovery of five YSGs with pulsation periods faster than 1 day, found in a sample of 76 cool supergiants observed by the Transiting Exoplanet Survey Satellite at a two-minute cadence. These pulsating YSGs are concentrated in an H-R diagram region not previously associated with pulsations; we conclude that this is a genuine new class of pulsating star, fast yellow pulsating supergiants (FYPSs). For each FYPS, we extract frequencies via iterative prewhitening and conduct a time-frequency analysis. One FYPS has an extracted frequency that is split into a triplet, and the amplitude of that peak is modulated on the same timescale as the frequency spacing of the triplet; neither rotation nor binary effects are likely culprits. We discuss the evolutionary status of FYPS and conclude that they are candidate post-RSGs. All stars in our sample also show the same stochastic low-frequency variability found in hot OB stars and attributed to internal gravity waves. Finally, we find four α Cygni variables in our sample, of which three are newly discovered.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Massive stars - Evolved stars - Supergiant stars - Light curves - Stellar pulsations - Red supergiant stars - Multi-periodic pulsation - Wavelet analysis - Lomb-Scargle periodogram - Asteroseismology - Stellar astronomy - Yellow hypergiant stars

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 82

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Number of rows : 82
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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9944 1
2 V* HS Cas s*r 01 08 19.9201927629 +63 35 11.504718283 14.52 12.33 9.82     M4Ia 47 0
3 V* AZ Cas s*r 01 42 16.5135206867 +61 25 16.343171243 11.32 10.94 9.22     K5Iab-Ib 74 0
4 V* V589 Cas s*r 01 46 05.4812080961 +60 59 36.677380361   11.2 8.886     M3Iab-Ib 32 0
5 V* V774 Cas s*r 01 47 00.0108610894 +60 22 20.372675703   10.9 8.59     M3Iab-Ib 34 0
6 V* BU Per LP* 02 18 53.2909785794 +57 25 16.763845850 15.53 12.87 10.40     M4Ib 88 0
7 V* V605 Cas s*r 02 20 22.4633097592 +59 40 16.911006172 13.41 10.80 8.36 6.42 4.85 M2Iab 63 0
8 V* AD Per s*r 02 20 29.0027235674 +56 59 35.243403712 12.70 10.16 7.8490   7.1111 M3Iab 122 1
9 V* FZ Per s*r 02 20 59.6453535686 +57 09 29.965933600 12.75 10.20 7.9620   6.7185 M1Iab 108 0
10 V* PR Per s*r 02 21 42.4096612239 +57 51 46.148946906 12.84 10.31 8.00 6.13 4.60 M1-Iab-Ib 106 0
11 V* SU Per s*r 02 22 06.8945607706 +56 36 14.896842798 13.86 11.57 9.40     M3-M4Iab 135 0
12 V* RS Per s*r 02 22 24.2951350259 +57 06 34.100118658 12.37 10.09 8.7680     M3.5IabFe-1 133 0
13 V* V439 Per s*r 02 23 11.0652506389 +57 11 57.982874757 12.81 10.41 8.1650   6.8612 M0.5Iab 72 0
14 V* V441 Per s*r 02 25 21.8599381234 +57 26 14.137762984 13.07 10.61 8.22 6.09 4.29 M3Iab 75 0
15 V* YZ Per s*r 02 38 25.4198565398 +57 02 46.198062168 14.96 12.37 10.01     M1Iab 91 0
16 V* W Per s*r 02 50 37.8926244676 +56 59 00.297385667 14.80 12.24 9.62 6.99 4.75 M3Iab-M5I 107 0
17 V* V648 Cas s*r 02 51 03.9484484442 +57 51 19.923645406 14.78 12.11 9.38 6.83 4.76 M2Ia 56 0
18 HD 17958 V* 02 56 24.6494731057 +64 19 56.796732528   8.176 6.167     K3Ib 54 0
19 HD 270754 s*b 04 47 04.4509246872 -67 06 53.119185546 10.351 11.219 11.26   10.992 B1.5Ia 65 0
20 HD 268687 s*y 04 50 55.8566544721 -69 25 52.504789755 11.33 11.12 10.730 10.70 10.145 F6Ia 27 0
21 WOH G 64 Mi* 04 55 10.5252313969 -68 20 29.998470169     18.46 15.69 12.795 M7.5 86 0
22 HD 268798 s*b 04 57 08.0554804810 -68 25 12.294661964 10.319 11.480 11.49     B2Ia 15 0
23 SV* HV 883 cC* 05 00 07.5646996952 -68 27 00.064482625 14.033 13.86 11.63 11.35 10.91 F8/G0Ia 73 0
24 HD 269110 * 05 09 10.6085115495 -69 36 12.204616518 12.51 11.76 10.82     G0I: 27 0
25 HD 269101 s*b 05 09 45.1934237181 -68 46 09.875912768   12.00 12.03 11.950   B3Iab 19 0
26 SK -69 68 * 05 09 58.8042153887 -69 07 01.785739793 11.703 12.58 12.616 12.48 12.717 B1II 12 0
27 HD 269128 s*b 05 10 22.7894940469 -68 46 23.818379498 9.77 10.52 10.412 10.29 10.268 B2.5Ieq 96 0
28 HD 33299 * 05 10 34.9750118364 +30 47 51.145118209   8.27 6.69     K0-Ib 44 0
29 SK -67 57 * 05 11 52.0793666451 -67 09 57.741960697 11.933 12.732 12.220   11.518 B2III 14 0
30 HD 269331 s?y 05 18 01.8330161056 -69 33 37.765141582   10.56 10.31 9.72 9.869 A5Ia0 29 0
31 HD 269392 * 05 19 51.8118368267 -69 53 08.525048859   12.36 12.12 11.87   B3I 34 0
32 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15597 1
33 V* V362 Aur LP* 05 27 10.2178548171 +29 55 15.796759307   9.58 7.32     M1.5Ib 83 0
34 HD 269655 s*b 05 30 37.8473420058 -68 24 39.199527109   12.22 12.20 12.13   B0Ia 31 0
35 HD 269700 s*b 05 31 52.2818792698 -68 32 38.856584550 9.71 10.56 10.54 10.38 10.38 B1.5Iaeq 79 0
36 HD 269777 s*b 05 34 18.4617816984 -67 18 13.710462690   11.05 11.06     B3Ia 25 0
37 HD 269769 * 05 34 30.8565955472 -69 46 51.772099515   12.35 12.90     B0.5I 9 0
38 CPD-69 394 WR* 05 34 36.0885852897 -69 45 36.501895421 11.428 12.10 12.131 12.41 12.136 B0I+WN 17 0
39 HD 269786 * 05 35 03.6024355207 -69 45 02.031653811   11.19 11.18     B1I 14 0
40 W61 27-27 * 05 36 03.7927345234 -69 01 30.109243076 12.313 13.004 12.706 12.42 10.428 B1.5I 14 0
41 HD 269840 s*y 05 36 10.0815886330 -68 55 41.264482862   10.74 10.334   9.774 F3Ia 36 0
42 CPD-69 430 * 05 36 56.8131417562 -69 16 18.365925280   12.43 12.21 12.38   B8I 10 0
43 HD 269902 sg* 05 38 09.5829579840 -69 06 21.317259261   10.59 10.23     A1Ia+ 35 0
44 RMC 137 s*b 05 38 36.9620682844 -69 05 07.877452894   12.12 12.02   12.05 B1Ia 29 0
45 HD 269953 s*y 05 40 12.1670932520 -69 40 04.852901756   10.83 9.95     G0_0 77 0
46 CPD-69 491 * 05 40 48.8051846198 -69 16 51.204137629   12.00 11.88     B3I 14 0
47 HD 269997 s*b 05 41 20.3936112308 -69 05 07.275149978   11.36 11.20     B2.5Ia 51 0
48 HD 269992 s*b 05 41 27.6753624776 -69 48 03.752076043   11.27 11.22     B2.5Ia 47 0
49 W61 6-77 * 05 42 15.3728802453 -69 13 20.710293270   12.37 12.35 12.48 12.47 B2III 8 0
50 HD 270151 s*b 05 49 02.8406791877 -70 02 30.129976085 11.141 12.174 12.02   11.655 B2Ia 38 0
51 * 41 Gem V* 07 00 15.8232357229 +16 04 44.401770290 9.09 7.32 5.69 4.44 3.59 K3-Ib 98 0
52 V* QY Pup s*r 07 47 38.5263889310 -15 59 26.480009421   8.095 6.309     K1Ia-Iab 84 0
53 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 156 0
54 ESO 435-49 H2G 10 10 47.0262328423 -28 54 05.766192004   14.83 17 13.30   ~ 45 0
55 V* V349 Car s*r 10 29 35.3734614399 -57 57 58.976903752   9.96 7.89     M3Iab 36 0
56 HD 303250 s*r 10 44 20.0403665356 -58 03 53.452795608   10.79 8.691     M3Iab 24 0
57 V* RT Car s*r 10 44 47.1477509492 -59 24 48.123186340   10.62 8.551     M2+Iab 72 0
58 V* BO Car LP* 10 45 50.6571653672 -59 29 19.326473470 10.98 9.24 7.45 7.64   M4Ib 63 0
59 V* IX Car s*r 10 50 26.2988224629 -59 58 56.569610438   9.68 9.00     M2Iab 52 0
60 HD 95687 s*r 11 01 35.7592067144 -61 02 55.817925323   9.130 7.90     M2Iab 37 0
61 V* V528 Car LP* 11 03 06.1530861433 -60 54 38.623203426   8.55 6.57     M2Ib: 40 0
62 V* V602 Car s*r 11 13 29.9728028355 -60 05 28.851699080   10.68 8.815     M3Ia-Iab 45 0
63 V* V910 Cen LP* 11 35 44.9537674232 -61 34 41.019250573 11.60 9.106 6.859     M0Ib 47 0
64 V* V1092 Cen s*r 11 36 26.2181841140 -61 19 10.006003452   9.80 7.84     M2.5Iab-Ib 29 0
65 HD 101007 * 11 36 56.9201317188 -61 10 58.000582440 10.02 8.84 7.02     M3-Ib+B 32 0
66 V* V772 Cen s*r 11 41 49.4042348053 -63 24 52.455554592 10.43 9.64 7.85     M2Ibep+B? 60 0
67 V* V396 Cen s*r 13 17 25.0402177652 -61 35 02.342940206   9.93 7.92     M4Ia-Iab 38 0
68 HD 143183 s*r 16 01 36.2225519441 -54 08 35.606579272 11.09 10.50 10.00     M3Ia 43 0
69 HD 155603 sg* 17 14 27.6552731387 -39 45 59.943671782 11.17 8.69 6.44 4.60 3.36 K0_0-Ia 63 0
70 V* NR Vul s*r 19 50 11.9279772343 +24 55 24.177460007   12.41 9.36 6.60 4.49 M1Ia: 76 0
71 BD+35 4077 s?r 20 21 14.0688820060 +35 37 16.557335640 14.72 12.65 9.72 6.83 4.65 M3Iab: 47 0
72 V* BI Cyg s*r 20 21 21.8871531507 +36 55 55.725144903   11.48 8.40     M4Iab 103 0
73 V* BC Cyg s*r 20 21 38.5480930133 +37 31 58.917783927   14.61 11.30     M3.5Ia 160 0
74 V* KY Cyg s*r 20 25 58.0435813037 +38 21 07.675238156   13.62 13.50     M3Ia 95 0
75 V* RW Cyg s*r 20 28 50.5902663365 +39 58 54.418023246 13.00 10.60 8.00 5.32 3.25 M3-M4Ia-Iab 118 0
76 * alf Cyg sg* 20 41 25.91514 +45 16 49.2197 1.11 1.34 1.25 1.14 1.04 A2Ia 725 0
77 V* RW Cep s*r 22 23 07.0152079533 +55 57 47.616196874 11.25 8.87 6.65 4.94 3.78 K2_0-Ia 153 0
78 V* ST Cep s*r 22 30 10.7378149736 +57 00 03.067223413 14.30 11.98 9.70 7.50 5.75 M2Ia-Iab 76 0
79 V* W Cep s*r 22 36 27.5633747594 +58 25 33.953361477   9.44 7.59     M0Iaep 90 0
80 V* V809 Cas LP* 23 19 23.7721038117 +62 44 23.192492482   8.932 6.671     K4.5Ib 63 0
81 V* PZ Cas s*r 23 44 03.2794635453 +61 47 22.187155352 12.80 11.48 8.90 6.08 3.90 M3Ia 194 0
82 V* TZ Cas s*r 23 52 56.2369314439 +61 00 08.390398268 14.18 11.75 9.18     M3Iab 86 0

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2021.10.27-20:26:51

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