2012A&A...542A..50D


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.19CET16:20:58

2012A&A...542A..50D - Astronomy and Astrophysics, volume 542A, 50-50 (2012/6-1)

The VLT-FLAMES Tarantula Survey. V. The peculiar B[e]-like supergiant, VFTS 698, in 30 Doradus.

DUNSTALL P.R., FRASER M., CLARK J.S., CROWTHER P.A., DUFTON P.L., EVANS C.J., LENNON D.J., SOSZYNSKI I., TAYLOR W.D. and VINK J.S.

Abstract (from CDS):

We present an analysis of a peculiar supergiant B-type star (VFTS698/Melnick2/Parker1797) in the 30 Doradus region of the Large Magellanic Cloud which exhibits characteristics similar to the broad class of B[e] stars. We analyse optical spectra from the VLT-FLAMES survey, together with archival optical and infrared photometry and X-ray imaging to characterise the system. We find radial velocity variations of around 400km/sin the high excitation SiIV, NIII and HeII spectra, and photometric variability of ∼0.6mag with a period of 12.7d. In addition, we detect long-term photometric variations of ∼0.25mag, which may be due to a longer-term variability with a period of ∼400d. We conclude that VFTS698 is likely an interacting binary comprising an early B-type star secondary orbiting a veiled, more massive companion. Spectral evidence suggests a mid-to-late B-type primary, but this may originate from an optically-thick accretion disc directly surrounding the primary.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: spectroscopic - stars: peculiar - stars: emission-line, Be - stars: variables: general

Simbad objects: 26

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Number of rows : 26

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 LHA 115-S 6 s*b 00 46 55.0295095056 -73 08 34.139503944 12.14 13.02 12.91   12.52 B0/0.5[e] 78 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9649 1
3 LHA 115-S 22 Em* 00 55 32.4861896833 -72 06 37.076185707   12.0 14.7     ~ 7 0
4 LHA 115-S 35 Em* 01 02 07.0043887110 -71 30 03.372493090 13.23 14.21 14.18   13.97 B1 11 0
5 [S71b] V39 Ce* 01 05 02.0432969169 +02 10 24.858316120   19.47 18.851 18.422 17.617 ~ 17 0
6 LIN 495 Em* 01 12 19.7043742663 -73 51 26.025575647 14.62 14.61 14.63   14.49 (kA5mF0)/B[e] 19 0
7 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5231 1
8 CPD-75 116 s*b 01 44 03.8712992159 -74 40 49.801190680   11.54 11.43 11.69   B5Ia[e] 76 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5823 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15113 1
11 Cl* NGC 2070 MEL 50 SB* 05 38 38.4788662377 -69 06 22.019253248   13.80 13.655   13.314 O9.7III:+O7:: 22 0
12 Cl* NGC 2070 MH 85 Be? 05 38 40.779 -69 06 03.37   16.33 16.10   16.10 B[e]? 6 0
13 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1766 1
14 CPD-69 457 s*b 05 38 45.706 -69 06 22.24 11.233 12.094 11.996   10.066 B0.5Ia 21 0
15 W61 7-14 SB* 05 38 51.0429425948 -69 06 20.499807370 13.350 14.202 13.835   13.633 B2Ip+O9III: 22 0
16 W61 7-27 s*b 05 38 57.3147296670 -69 07 09.775903205 14.514 13.891 14.134 13.98 12.884 B3Ia 19 0
17 W61 7-29 s*b 05 39 04.7712590119 -69 04 09.923266718 12.403 13.154 12.756     B1Ia 17 0
18 W61 7-28 SB* 05 39 04.8728779559 -69 05 40.479038802 13.507 14.355 14.240   13.891 B0.5V 14 0
19 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2245 0
20 HD 94878 bL* 10 55 58.9150038252 -60 23 33.434805592 8.67 9.37 8.70 8.07   B0/2eq 142 0
21 V* BY Cru bL* 12 04 48.6318277874 -62 00 08.191833660 7.85 8.18 7.63 8.70   F0Ib/II 35 0
22 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 483 0
23 V* W Ser Al* 18 09 50.6487890730 -15 33 00.269169421   9.64 8.42     F8/G2Iaep(+A) 130 0
24 V* RY Sct Be* 18 25 31.4772031860 -12 41 24.196044092 10.25 10.38 9.12 9.46   O9.7Ibep 286 1
25 * bet Lyr EB* 18 50 04.7952472 +33 21 45.609978 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 891 0
26 V* V367 Cyg bL* 20 47 59.5848515369 +39 17 15.722701132 8.080 7.680 6.990     A3Ibep 198 0

    Equat.    Gal    SGal    Ecl

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2021.01.19-16:20:58

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