2019A&A...627A..99N


Query : 2019A&A...627A..99N

2019A&A...627A..99N - Astronomy and Astrophysics, volume 627A, 99-99 (2019/7-1)

Variations on a theme: the puzzling behaviour of Schulte 12.

NAZE Y., RAUW G., CZESLA S., MAHY L. and CAMPOS F.

Abstract (from CDS):

One of the first massive stars detected in X-rays, Schulte 12 has remained a puzzle in several aspects. In particular, its extreme brightness both in the visible and X-ray ranges is intriguing. Thanks to Swift and XMM-Newton observations covering ∼5000 d, we report the discovery of a regular 108d modulation in X-ray flux of unknown origin. The minimum in the high-energy flux appears due to a combination of increased absorption and decreased intrinsic emission. We examined in parallel the data from a dedicated spectroscopic and photometric monitoring in the visible and near-IR domains, complemented by archives. While a similar variation timescale is found in those data, they do not exhibit the strict regular clock found at high energies. Changes in line profiles cannot be related to binarity but rather correspond to non-radial pulsations. Considering the substantial revision of the distance of Schulte 12 from the second Gaia data release, the presence of such oscillations agrees well with the evolutionary status of Schulte 12, as it lies in an instability region of the HR diagram.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: early-type - stars: massive - stars: winds - outflows - stars: variables: general - stars: individual: Schulte 12 - supergiants

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 225094 s*b 00 03 25.7156345788 +63 38 25.861065311 6.01 6.56 6.22 5.90 5.67 B2.9Iab 146 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
3 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 393 1
4 HD 269006 s*b 05 02 07.3942092168 -71 20 13.116800076 9.93 10.60 10.55 10.43 10.38 LBV 252 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
6 NAME Ori A MoC 05 38 -07.1           ~ 3017 0
7 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 715 0
8 HD 80077 s*b 09 15 54.7869062472 -49 58 24.575734452 10.50 10.29 9.00 7.89   B2.5Ia+ 144 0
9 THA 35-II-42 WR* 10 25 56.5024585224 -57 48 43.519215708   14.168 12.661 12.102   WN5ha/O3+O3Vz((f*)) 95 0
10 V* BP Cru HXB 12 26 37.5605188992 -62 46 13.261044684   12.482 10.803 10.304   B1Ia+ 689 0
11 * zet01 Sco s*b 16 53 59.7271314888 -42 21 43.307334468 4.80 5.31 4.79 4.32 3.86 B1.5Ia+ 372 0
12 * 9 Sgr Em* 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 543 0
13 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Ia+ 189 1
14 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B8Ia+ 279 2
15 HD 183143 s*b 19 27 26.5636061496 +18 17 45.193019136 8.25 8.08 6.86 5.74 4.79 B7Iae 444 0
16 HD 190603 s*b 20 04 36.1742825304 +32 13 06.953333016 5.73 6.19 5.65 5.13 4.71 B1.5Ia+ 344 0
17 * P Cyg s*b 20 17 47.2019733389 +38 01 58.549132671 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1178 1
18 BD+40 4214 * 20 31 47.5738013448 +41 06 38.073776004   9.03 8.56     F5 7 0
19 TYC 3161-1269-1 * 20 31 59.8402231704 +41 20 35.389105908   10.70 10.21     ~ 8 0
20 MR 110 WR* 20 32 03.0201049320 +41 15 20.499732216   15.99 13.97     WC5 82 0
21 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 290 0
22 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 399 0
23 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1942 2
24 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 424 0
25 TYC 3157-1310-1 * 20 33 07.2363663840 +41 08 25.556226504   10.30 10.18     ~ 9 0
26 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 232 0
27 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 945 0
28 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) 246 0
29 BD+40 4228 * 20 33 16.8464687304 +41 01 49.639918476   10.25 9.23     K 6 0
30 BD+40 4229 * 20 33 18.2632221336 +40 56 10.628246544   9.89 9.44     G 8 0

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