2004A&A...416..623M


Query : 2004A&A...416..623M

2004A&A...416..623M - Astronomy and Astrophysics, volume 416, 623-629 (2004/3-3)

On expansion parallax distances for planetary nebulae.

MELLEMA G.

Abstract (from CDS):

The distances to individual wind-driven bubbles such as Planetary Nebulae (PNe) can be determined using expansion parallaxes: the angular expansion velocity in the sky is compared to the radial velocity of gas measured spectroscopically. Since the one is a pattern velocity, and the other a matter velocity, these are not necessarily the same. Using the jump conditions for both shocks and ionization fronts, I show that for typical PNe the pattern velocity is 20 to 30% larger than the material velocity, and the derived distances are therefore typically 20 to 30% too low. I present some corrected distances and suggest approaches to be used when deriving distances using expansion parallaxes.

Abstract Copyright:

Journal keyword(s): shock waves - planetary nebulae - stars: distances - stars: AGB and post-AGB - hydrodynamics - ISM: planetary nebulae: general

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 IC 2448 PN 09 07 06.3191779848 -69 56 30.692677668   11.1 11.10     O(H)3III-V 232 0
2 NGC 3242 PN 10 24 46.1335521792 -18 38 32.296857792   11.83 12.15     ~ 818 1
3 NGC 6210 PN 16 44 29.5191019368 +23 47 59.421958296   12.3 11.7     Of/[WR] 587 0
4 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1168 1
5 NGC 6572 PN 18 12 06.3181909152 +06 51 13.027935240   9.3 10.8     [WC] 751 0
6 NGC 6578 PN 18 16 16.517 -20 27 02.67           [WC4/6] 203 0
7 PN Vy 2-2 PN 19 24 22.2390166933 +09 53 56.259102426   14.02 12.65 13.38   O-rich 260 0
8 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 950 0
9 NGC 6884 PN 20 10 23.6424784416 +46 27 39.631794408   11.9 10.9     ~ 314 1
10 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2449 1
11 NGC 7662 PN 23 25 53.8318792825 +42 32 05.835828380       11.427   ~ 925 0

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