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Table 1

Differential gamma-ray flux upper limits (95% confidence-level) for bow shocks of runaway stars.

ID Star l b d vwind Ṁ Live-time Upper limits E2 dΦ/dE [10−12 TeV cm−2 s−1]
(acc.-corr.) energy bins [TeV]
[°] [°] [pc] [km s−1] 10−6 M⊙/yr [h] 0.14−0.37 0.37−0.97 0.97−2.57 2.57−6.78 6.78−17.92 0.1−10
EB8 HIP 25923 210.44 −20.98 900 [1000] 0.06 3.9 (2.2) 2.01 0.71 0.65 0.33 − 0.40
EB13 HIP 32067** 206.20 0.85 2117±367 2960 0.13 21.7 (9.4) 0.62 0.28 0.25 0.62 0.35 0.12
EB15 HIP 38430 243.16 0.36 900 [2570] 0.70 1.8 (0.1) 45.73 2.79 1.73 − − 0.80
EB17 HIP 72510 318.77 2.77 350 [2545] 0.27 12.8 (2.4) 6.64 0.75 0.67 0.86 0.53 0.58
EB18 HIP 75095 322.68 0.91 800 [1065] 0.14 22.5 (13.9) 1.77 0.24 0.10 0.20 0.28 0.15
EB23 HIP 88652** 15.11 3.36 650 [1535] 0.50 9.2 (2.5) 2.53 1.52 0.52 0.50 1.16 0.72
EB24 HIP 92865** 41.75 3.41 350 [1755] 0.04 3.9 (2.3) 5.60 1.17 1.04 1.33 0.43 0.87
EB32 SER1*** 264.78 1.54 − 250 0.03 3.0 (2.0) 2.92 1.06 0.32 0.77 − 0.59
EB33 HIP 44368 263.10 3.90 1900 ± 200a 1100 0.80 7.9 (6.1) 1.97 0.63 0.31 0.20 0.25 0.36
EB36 SER2*** 282.48 −2.46 − − − 15.7 (7.9) 1.10 0.54 0.24 0.18 0.33 0.22
EB37 RCW 49-S1 284.08 0.43 6100 2800 3.23 51.3 (29.2) 1.77 0.34 0.11 0.19 0.21 0.17
EB38 RCW 49-S2 284.30 0.30 6100 2600 0.60 51.7 (31.5) 1.11 0.09 0.18 0.16 0.11 0.07
EB39 RCW 49-S3 284.34 0.20 6100 2800 2.00 52.2 (33.5) 2.18 0.35 0.14 0.08 0.15 0.16
EB40 SER3*** 286.46 −0.34 − 250 0.03 62.2 (29.0) 1.88 0.28 0.17 0.23 0.15 0.16
EB41 J1117-6120 291.88 −0.50 7600 2600 0.60 52.9 (32.3) 1.26 0.27 0.07 0.24 0.17 0.11
EB42 SER7*** 347.15 2.36 − − − 13.2 (7.7) 0.79 0.13 0.21 0.15 0.28 0.08
EB43 G4 352.57 2.11 1700 2550 0.50 4.8 (1.5) 1.82 0.26 0.27 0.48 − 0.22
EB44 G2** 352.81 1.34 1700 2250 0.40 20.9 (8.7) 1.08 0.21 0.16 0.36 0.57 0.13
EB45 G5 351.65 0.51 1700 2000 0.10 28.0 (11.9) 0.49 0.32 0.21 0.28 0.55 0.18
EB46 G6 353.06 1.29 1700 [1000] 0.10 30.1 (11.6) 0.32 0.14 0.11 0.25 0.29 0.07
EB47 G8 353.16 1.05 1700 [1500] 0.04 34.9 (16.6) 0.68 0.34 0.22 0.28 0.24 0.20
EB48 G1 353.42 0.45 1700 2100 0.20 56.4 (31.1) 0.56 0.22 0.12 0.09 0.26 0.12
EB49 G7 354.03 0.85 1700 [1000] 0.10 38.0 (20.5) 0.18 0.10 0.11 0.05 0.08 0.04
EB50 G3 353.30 0.08 1700 2000 0.40 48.3 (29.9) 0.85 0.29 0.09 0.24 0.05 0.19
EB51 HIP 86768 18.70 11.60 737 [550] 0.03 1.3 (0.4) 9.39 1.45 0.98 3.45 3.44 0.94
EB52 Star 1** 16.99 1.77 1800 2200 0.63 20.6 (13.9) 0.65 0.18 0.18 0.22 0.25 0.12
EB53 M 17-S1* 15.08 0.65 1600 1000 0.03 22.7 (6.6) 0.59 0.09 0.13 0.17 0.32 0.06
EB54 M 17-S2 15.08 0.65 1600 [1500] 0.16 22.7 (6.6) 0.59 0.09 0.13 0.17 0.32 0.06
EB55 M 17-S3* 15.08 0.65 1600 2300 0.25 22.7 (6.6) 0.59 0.09 0.13 0.17 0.32 0.06
EB56 BD -14 5040 16.89 −1.12 1800 400 0.03 111.3 (73.2) 0.28 0.09 0.13 0.09 0.09 0.09
EB57 4U 1907+09 43.74 0.47 4000 2900 0.70 94.2 (63.1) 0.92 0.06 0.10 0.06 0.11 0.04
EB58 HIP 98418 71.60 2.90 529.1 2545 0.24 4.1 (3.0) − 55.94 1.48 0.81 1.00 1.46

Notes. ID, Star, distance d, wind velocity vwind and mass-loss rate Ṁ as listed in Peri et al. (2015). The positions with the coordinates l and b denote the ones used for the analysis, which is not in all cases equal to the one in Peri (Peri et al. 2012, and 2015) (see text for details). Wind velocity: All values from Peri et al. (2012); brackets indicate values adopted from stars with the same spectral type. The live-time, how long each object was observed with H.E.S.S., is also listed. The acceptance-corrected live-time (the observation time corrected for the non-uniform acceptance across the field of view of the camera) is given in parentheses.

(*) The bow shocks M 17-S1, M 17-S2 and M 17-S3 are closer than 0.1 degree and therefore not resolvable by H.E.S.S., the upper limits are calculated for the position of M 17-S2 but valid for all three bow shock candidates.

(**) The analysis was done for the bow shock coordinates, see text for more details.

(***) The coordinates listed in second E-BOSS catalogue release are the apex coordinates of the bow shock, not the star’s.

(a) Distance uncertainty wrong in second E-BOSS catalogue release (1900 ± 0.1 pc), original paper (Sadakane et al. 1985) 1.9 ± 0.2 kpc.

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