2002A&A...386..885S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.25CET22:57:44

2002A&A...386..885S - Astronomy and Astrophysics, volume 386, 885-890 (2002/5-2)

Spherical planetary nebulae.

SOKER N.

Abstract (from CDS):

By examining their mass loss history and their distribution in the galaxy, I argue that spherical planetary nebulae (PNe) form a special group among all planetary nebulae. The smooth surface brightness of most spherical PNe suggests that their progenitors did not go through a final intensive wind (FIW, also termed superwind) phase. While ∼70% of the PNe of all other PNe groups are closer to the galactic center than the sun is, only ∼30% of spherical PNe are; ∼70% of them are farther away from the galactic center. These, plus the well-known high scale height above the galactic plane of spherical PNe, suggest that the progenitors of spherical PNe are low mass stars having low metallicity. Although many stars have these properties, only ∼10% of all PNe are spherical. By comparing the galactic distribution of spherical PNe to the metallicity evolution in the galaxy, I find that the critical metallicity above which no spherical PNe are formed is [Fe/H]~-0.4. I explain this as well as other properties of spherical PNe in the context of the companion model for shaping PNe, arguing that spherical PNe are formed from stars that have no close companion, stellar or substellar, orbiting them. I discuss the connection of the proposed scenario to the recent finding of extrasolar planets and to the presence of blue horizontal branch stars in globular clusters.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general - stars: AGB and post-AGB - stars: mass loss - stars: planetary systems - stars: rotation

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 - 2020
#notes
1 PN H 3-75 PN 05 40 44.9722709472 +12 21 22.518128674   14.8       ~ 51 0
2 PN A66 15 PN 06 27 02.0385418052 -25 22 49.699315787   15.41 15.72     sdOp 99 1
3 PN A66 30 PN 08 46 53.4640384491 +17 52 46.368019418   14.23 14.30 13.47   [WC5] 375 0
4 PN A66 33 PN 09 39 09.1416894235 -02 48 30.487554710   15.38 15.54     DAO 134 0
5 PN Lo 4 PN 10 05 45.7878014012 -44 21 33.523563573           sdO 124 1
6 IC 3568 PN 12 33 06.871 +82 33 48.95   11.4 11.1     ~ 388 1
7 PN K 1-14 PN 17 42 36.76 +21 27 02.5           ~ 59 0
8 PN LSA 1 PN 19 13 55.692 -06 18 52.20           ~ 17 0
9 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 915 0
10 PN K 3-73 PN 20 03 59.953 +49 19 06.15           ~ 23 0
11 PN A66 71 PN 20 32 23.216 +47 20 50.41   19.384 19.335 19.253 19.185 ~ 70 0

    Equat.    Gal    SGal    Ecl

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2020.02.25-22:57:44

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