High-speed knots in the hourglass shaped planetary nebula Hubble 12
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High-speed knots in the hourglass shaped planetary nebula Hubble 12. / Vaytet, N. M. H.; Rushton, A. P.; Lloyd, M.; López, J. A.; Meaburn, J.; O'Brien, T. J.; Mitchell, D. L.; Pollacco, D.
In: Monthly Notices of the Royal Astronomical Society, Vol. 398, No. 1, 28.05.2009, p. 385-393.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - High-speed knots in the hourglass shaped planetary nebula Hubble 12
AU - Vaytet, N. M. H.
AU - Rushton, A. P.
AU - Lloyd, M.
AU - López, J. A.
AU - Meaburn, J.
AU - O'Brien, T. J.
AU - Mitchell, D. L.
AU - Pollacco, D.
N1 - 9 pages, 6 figures, accepted for publication in MNRAS
PY - 2009/5/28
Y1 - 2009/5/28
N2 - We present a detailed kinematical analysis of the young compact hourglass-shaped planetary nebula Hb 12. We performed optical imaging and longslit spectroscopy of Hb 12 using the Manchester echelle spectrometer with the 2.1m San Pedro Martir telescope. We reveal, for the first time, the presence of end caps (or knots) aligned with the bipolar lobes of the planetary nebula shell in a deep [NII]6584 image of Hb 12. We measured from our spectroscopy radial velocities of 120 km/s for these knots. We have derived the inclination angle of the hourglass shaped nebular shell to be 65 degrees to the line of sight. It has been suggested that Hb 12's central star system is an eclipsing binary (Hsia et al. 2006) which would imply a binary inclination of at least 80 degrees. However, if the central binary has been the major shaping influence on the nebula then both nebula and binary would be expected to share a common inclination angle. Finally, we report the discovery of high-velocity knots with Hubble-type velocities, close to the core of Hb 12, observed in Halpha and oriented in the same direction as the end caps. Very different velocities and kinematical ages were calculated for the outer and inner knots showing that they may originate from different outburst events.
AB - We present a detailed kinematical analysis of the young compact hourglass-shaped planetary nebula Hb 12. We performed optical imaging and longslit spectroscopy of Hb 12 using the Manchester echelle spectrometer with the 2.1m San Pedro Martir telescope. We reveal, for the first time, the presence of end caps (or knots) aligned with the bipolar lobes of the planetary nebula shell in a deep [NII]6584 image of Hb 12. We measured from our spectroscopy radial velocities of 120 km/s for these knots. We have derived the inclination angle of the hourglass shaped nebular shell to be 65 degrees to the line of sight. It has been suggested that Hb 12's central star system is an eclipsing binary (Hsia et al. 2006) which would imply a binary inclination of at least 80 degrees. However, if the central binary has been the major shaping influence on the nebula then both nebula and binary would be expected to share a common inclination angle. Finally, we report the discovery of high-velocity knots with Hubble-type velocities, close to the core of Hb 12, observed in Halpha and oriented in the same direction as the end caps. Very different velocities and kinematical ages were calculated for the outer and inner knots showing that they may originate from different outburst events.
KW - astro-ph.GA
U2 - 10.1111/j.1365-2966.2009.15149.x
DO - 10.1111/j.1365-2966.2009.15149.x
M3 - Journal article
VL - 398
SP - 385
EP - 393
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 186916786