1997A&A...320..568W


Query : 1997A&A...320..568W

1997A&A...320..568W - Astronomy and Astrophysics, volume 320, 568-574 (1997/4-2)

The bipolar structure of the LBV nebula around HR Carinae.

WEIS K., DUSCHL W.J., BOMANS D.J., CHU Y.-H. and JONER M.D.

Abstract (from CDS):

HR Carinae is one of the few Luminous Blue Variables (LBVs) in the Galaxy. It has a nebula that appears bipolar. We have obtained imaging and high-dispersion, long-slit echelle data of the HR Car nebula, and confirmed that it is a bipolar nebula. Its polar axis lies along the position angle of 125±5°; each lobe has, at a distance of 5kpc a diameter of ∼0.65pc and a line-of-sight expansion velocity of 75-150km/s. Beside the expanding bipolar lobes, a number of [NII]-bright knots are detected. These knots have lower expansion velocities than the lobes and are detected only within the projected boundary of the lobes. These knots are most likely nitrogen-enriched material ejected by HR Car. On a larger scale, a funnel-shaped nebula is detected at 2.5' northwest of HR Car. The axis of the funnel is roughly aligned with the polar axis of the HR Car nebula, suggesting that HR Car may be responsible for the ionization and shaping of this nebula. Future observations of kinematics and abundances are needed to determine the nature of this nebula. We propose that the bipolar nebula of HR Car is a more evolved version of the Homunculus Nebula around η Car. The recently developed theory of wind-compressed disks may explain the higher density of the equatorial plane and the formation of bipolar nebulae of LBVs.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: individual: HR Car, η Car - stars: mass-loss - ISM: bubbles: jets and outflows

CDS comments: Knots in table 1 not in SIMBAD

Simbad objects: 7

goto View the references in ADS

Number of rows : 7
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 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 319 0
2 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2326 0
3 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 611 0
4 [RAA2005] G332.783-1.445 HII 16 24.0 -51 31           ~ 42 0
5 NGC 6571 GiG 18 10 49.3134827832 +21 14 18.820635900   15.4       ~ 13 0
6 Hen 2-427 WR* 19 11 30.8749167768 +16 51 38.200938264   12.19 11.50     WN8h 328 0
7 NGC 6888 ISM 20 12 07 +38 21.3   7.44       WN6b(h) 265 1

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2022.05.20-19:34:56

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