2003A&A...410..911R


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET13:03:18

2003A&A...410..911R - Astronomy and Astrophysics, volume 410, 911-916 (2003/11-2)

The kinematics of the most oxygen-poor planetary nebula PN G135.9+55.9.

RICHER M.G., LOPEZ J.A., STEFFEN W., TOVMASSIAN G.H., STASINSKA G. and ECHEVARRIA J.

Abstract (from CDS):

PN G135.9+55.9 is a compact, high excitation nebula that has been identified recently as the most oxygen-poor halo planetary nebula. Given its very peculiar characteristics and potential implications in the realms of stellar and Galactic evolution, additional data are needed to firmly establish its true nature and evolutionary history. Here we present the first long-slit, high spectral resolution observations of this object in the lines of Hα and HeIIλ4686. The position-velocity data are shown to be compatible with the interpretation of PN G135.9+55.9 being a halo planetary nebula. In both emission lines, we find the same two velocity components that characterize the kinematics as that of an expanding elliptical envelope. The kinematics is consistent with a prolate ellipsoidal model with axis ratio about 2:1, a radially decreasing emissivity distribution, a velocity distribution that is radial, and an expansion velocity of 30km/s for the bulk of the material. To fit the observed line profiles, this model requires an asymmetric matter distribution, with the blue-shifted emission considerably stronger than the red-shifted emission. We find that the widths of the two velocity components are substantially wider than those expected due to thermal motions, but kinematic structure in the projected area covered by the slit appears to be sufficient to explain the line widths. The present data also rule out the possible presence of an accretion disk in the system that could have been responsible for a fraction of the Hα flux, further supporting the planetary nebula nature of PN G135.9+55.9.

Abstract Copyright:

Journal keyword(s): planetary nebulae: individual: PN G135.9+55.9, SBS 1150+599A

Simbad objects: 6

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Number of rows : 6

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 PN BoBn 1 PN 00 37 16.03 -13 42 58.6   16       ~ 126 1
2 SBSS 1150+599 PN 11 53 24.7390111544 +59 39 57.048984657   17.5       O(H)III-V 61 0
3 NGC 4361 PN 12 24 30.7509091298 -18 47 05.564628299   12.8 13.2     [WC] 385 1
4 PN H 4-1 PN 12 59 27.77 +27 38 10.5   15.92       ~ 153 0
5 PN G009.8-07.5 PN 18 36 22.820 -23 55 18.26       13.52 12.44 ~ 93 0
6 IC 4997 PN 20 20 08.7615653034 +16 43 53.993812400   11.94 11.15     [WC7/8] 530 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-13:03:18

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