2016A&A...587A.115M


Query : 2016A&A...587A.115M

2016A&A...587A.115M - Astronomy and Astrophysics, volume 587A, 115-115 (2016/3-1)

Luminous blue variables: An imaging perspective on their binarity and near environment.

MARTAYAN C., LOBEL A., BAADE D., MEHNER A., RIVINIUS T., BOFFIN H.M.J., GIRARD J., MAWET D., MONTAGNIER G., BLOMME R., KERVELLA P., SANA H., STEFL S., ZOREC J., LACOUR S., LE BOUQUIN J.-B., MARTINS F., MERAND A., PATRU F., SELMAN F. and FREMAT Y.

Abstract (from CDS):

Luminous blue variables (LBVs) are rare massive stars with very high luminosity. They are characterized by strong photometric and spectroscopic variability related to transient eruptions. The mechanisms at the origin of these eruptions is not well known. In addition, their formation is still problematic and the presence of a companion could help to explain how they form. This article presents a study of seven LBVs (about 20% of the known Galactic population), some Wolf-Rayet stars, and massive binaries. We probe the environments that surround these massive stars with near-, mid-, and far-infrared images, investigating potential nebula/shells and the companion stars. To investigate large spatial scales, we used seeing-limited and near diffraction-limited adaptive optics images to obtain a differential diagnostic on the presence of circumstellar matter and to determine their extent. From those images, we also looked for the presence of binary companions on a wide orbit. Once a companion was detected, its gravitational binding to the central star was tested. Tests include the chance projection probability, the proper motion estimates with multi-epoch observations, flux ratio, and star separations. We find that two out of seven of LBVs may have a wide orbit companion. Most of the LBVs display a large circumstellar envelope or several shells. In particular, HD 168625, known for its rings, possesses several shells with possibly a large cold shell at the edge of which the rings are formed. For the first time, we have directly imaged the companion of LBV stars.

Abstract Copyright:

Journal keyword(s): stars: variables: S Doradus - stars: Wolf-Rayet - stars: imaging - binaries: general - stars: winds, outflows

VizieR on-line data: <Available at CDS (J/A+A/587/A115): tableb1.dat tableb2.dat list.dat fits/*>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SN 2005gl SN* 00 49 50.02 +32 16 56.8       17.0   SNIIn 131 2
2 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 373 1
3 SN 2005gj SN* 03 01 11.96 -00 33 13.9   18.6       SNIapec 186 1
4 V* S Dor sg* 05 18 14.3570612088 -69 15 01.149576912 9.08 10.39 10.25 9.74 9.14 A5Iaeq 363 0
5 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4694 2
6 SN 2010jl SN* 09 42 53.33 +09 29 41.8           SNIIn 235 1
7 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 319 0
8 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 345 1
9 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2326 0
10 NAME Sher 25 star * 11 15 07.6447245696 -61 15 17.611428348   13.63 12.27     B1.5Iab 78 1
11 HD 152234 s*b 16 54 01.8374467 -41 48 23.007764 4.92 5.64 5.45     B0.5Ia 187 0
12 [GMC2001] 10-3465 Mi* 17 46 14.394 -28 50 02.58           ~ 8 0
13 WR 102e WR* 17 46 14.81 -28 50 00.6           WC8-9(d?+OB?) 13 0
14 [FMM95] 3 s*b 17 46 15.240 -28 50 03.58           LBV 145 1
15 WR 102ka WR* 17 46 18.12 -29 01 36.6           WN10 30 0
16 * 9 Sgr Em* 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 528 0
17 [KMN95] Star A s*b 18 08 40.312 -20 24 41.14           LBV 40 3
18 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Iaep 181 1
19 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 267 2
20 EM* MWC 930 s*b 18 26 25.2364693368 -07 13 17.815243512   14.20 11.51 11.87 9.40 B5/9Iaeq 44 1
21 BD+14 3887 Em* 19 21 33.9771479376 +14 52 56.910478296 11.86 11.3 9.89     B3Ibe 88 0

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2022.05.28-10:56:58

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