2000A&A...354..551R

Query : 2000A&A...354..551R

2000A&A...354..551R - Astronomy and Astrophysics, volume 354551-556 (2000/2-2)

A search for nonthermal radio emission from OB and WR stars with RATAN-600.

RAGUZOVA N.V. and SIDORENKOV V.N.

Abstract (from CDS):

We have searched for nonthermal radio emission from 40 OB and WR stars. Enhanced nonthermal radio emission from an early-type star could be evidence for the presence of a collapsed companion, and thus for its origin as the result of a supernova explosion in a massive binary. As shown in the evolutionary calculations of joint evolution of a neutron star and a normal star in binaries (Lipunov & Prokhorov, 1987AZh....64.1189L), a considerable fraction of neutron stars in binary systems having an optical companion must be in the ejector state. A neutron star in this state generates a relativistic wind like an isolated radio pulsar. Most ejectors in binary systems can not be identified as radio pulsars because of absorption of radiowaves in the stellar wind of the normal companion, but instead, they may appear as sources of high-energy quanta due to the synchrotron radiation of relativistic particles (ejected by the radio pulsar) in the magnetic field of a normal star (Lipunov & Prokhorov, 1984Ap&SS..98..221L; Lipunov & Nazin, 1994A&A...289..822L). In this case a source of nonthermal radiation in a wide range from radio to hard gamma-ray may appear as a result of a specific reflection effect in the magnetic field of the optical companion. Cyg X-3 and the periodic radioburster LS I +61 303 may be examples of just this kind. To test this idea, measurements of radio flux densities in the range from 0.96 to 21.7GHz from selected OB and WR stars were made with the RATAN-600. No nonthermal radio emission from the selected stars were detected.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - stars: Wolf-Rayet - stars: binaries: close - radio continuum: stars - radiation mechanisms: non-thermal

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 QSO B0237-2322 QSO 02 40 08.1743783856 -23 09 15.729012036   16.78 16.63     ~ 516 1
3 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 903 2
4 * pi. Ari ** 02 49 17.55924 +17 27 51.5168 4.68         B6V 104 0
5 * u Tau SB* 03 45 40.4433670200 +06 02 59.985349222   5.225 5.337     B3V 139 0
6 HD 24190 SB* 03 52 18.9579628248 +34 13 19.612811028 6.84 7.46 7.45     B2V 106 0
7 * ksi Per ** 03 58 57.9024302099 +35 47 27.709515737 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 850 0
8 V* V490 Per SB* 04 06 39.0433582368 +32 23 06.211533840   7.11 7.0     B3V 88 0
9 * mu. Eri SB* 04 45 30.1514281206 -03 15 16.775320589 3.26 3.87 4.00     B5IV 170 0
10 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 751 0
11 HD 37737 SB* 05 42 31.1584798320 +36 12 00.508318740 8.02 8.30 8.06     O9.5II-III(n) 100 0
12 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
13 2C 553 QSO 06 27 10.125 -05 53 06.21           ~ 165 1
14 HD 50896 WR* 06 54 13.0439608392 -23 55 42.023319852 5.74 6.63 6.91 7.74   WN4b 794 0
15 HD 56925 WR* 07 18 29.1311435688 -13 13 01.513932528 11.21 11.74 11.56 11.40   WN4b 181 0
16 HD 62910 WR* 07 44 58.2217347768 -31 54 29.554957188 10.08 10.44 10.10 10.17   WN6/WC4 134 0
17 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 951 0
18 4C 39.25 Bla 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1036 1
19 WR 19 WR* 10 18 04.9885430688 -58 16 26.244521868   14.80 13.85     WC5+O9 74 0
20 QSO B1245-197 QSO 12 48 23.89808243 -19 59 18.5899475   21.52 20.5     ~ 145 1
21 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
22 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
23 * zet04 Lib V* 15 32 55.2212555688 -16 51 10.241221140 4.61 5.355 5.499     B3V 121 0
24 * lam Lib SB* 15 53 20.0538968232 -20 10 01.471003716 4.43 4.997 5.027     B3V 223 0
25 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 776 0
26 V* V600 Her SB* 16 36 58.2040305408 +14 28 30.910523016 5.87 6.845 7.028     B0.5III 165 0
27 LS 3982 WR* 17 14 27.1191622584 -39 45 47.051105904 10.63 10.95 10.41     WN6h-w 73 0
28 HD 156327 WR* 17 18 23.0613730 -34 24 30.630847 9.88 9.95 9.32 9.67   WC7+B0III 124 0
29 WRAY 15-1666 WR* 17 18 52.8750705984 -38 50 03.606746928 13.93 13.27 11.83 11.43   WN7 79 0
30 HD 161573 SB* 17 46 07.3255120272 +05 31 48.717378912   6.824 6.848     B4 84 0
31 HD 168206 WR* 18 19 07.3629298440 -11 37 59.164994424 9.65 9.88 9.10     WC8+O8/9III/V 308 1
32 RAFGL 2179 WR* 18 31 42.2111779224 -09 59 16.687233168   25.0 22.0     WC9 91 0
33 EM* AS 320 WR* 18 44 13.1526105048 -03 47 57.775268904 13.7 13.340 13.983     WC9d 121 0
34 HD 178329 SB* 19 06 17.0359429608 +41 24 49.615607376 5.66 6.345 6.496     B3V 79 0
35 MR 93 WR* 19 28 15.6142522320 +19 33 21.527693100   14.83       WC7+O9(III) 114 0
36 WR 126 WR* 19 39 56.1963949728 +26 34 42.481553196   13.99 13.29     WC5 38 0
37 HD 188209 s*b 19 51 59.0687638680 +47 01 38.419078944 4.61 5.55 5.63 5.54 5.64 O9.5Iab 322 0
38 * 9 Sge s*b 19 52 21.7649260368 +18 40 18.751320984 5.32 6.24 6.23     O7.5Iabf 308 1
39 HD 190918 WR* 20 05 57.3244526328 +35 47 18.150756792 6.11 6.88 6.75     WN5+O9I 385 0
40 HD 191765 WR* 20 10 14.1928045152 +36 10 35.070683376 7.64 8.08 8.08     WN6-s 452 0
41 HD 192103 WR* 20 11 53.5274337792 +36 11 50.525765304 7.77 8.13 8.11     WC8+OB: 339 0
42 HD 192163 WR* 20 12 06.5418877464 +38 21 17.784181008 7.12 7.49 7.50     WN6(h)-s 715 1
43 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
44 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
45 HD 197406 WR* 20 41 21.5485520640 +52 35 15.142636896 10.42 10.87 10.30     WN8h+B3IV/BH 200 0
46 V* V1792 Cyg SB* 20 51 30.9396596136 +37 59 22.168480164 6.82 7.36 7.27     B2V 56 0
47 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
48 * 68 Cyg SB* 21 18 27.1862219256 +43 56 45.399147864 4.05 4.99 5.00     O7.5IIIn((f)) 383 0
49 ICRF J213032.8+050217 AG? 21 30 32.87740078 +05 02 17.4745177     23.4     ~ 164 1
50 * pi.02 Cyg SB* 21 46 47.6097792927 +49 18 34.454260528 3.4 4.11 4.18     B2.5III 180 0
51 V* V365 Lac SB* 22 05 51.2185933968 +48 13 53.377700088 5.5 6.160 6.254     B2V 101 0
52 HD 214930 * 22 41 25.7301468456 +23 50 47.674859172 6.56 7.27 7.40     B2IV 69 0

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