2006MNRAS.368..819P

Query : 2006MNRAS.368..819P

2006MNRAS.368..819P - Mon. Not. R. Astron. Soc., 368, 819-824 (2006/May-2)

The importance of soft X-rays for the excitation of H2emission in planetary nebulae.

PHILLIPS J.P.

Abstract (from CDS):

We note that H2emitting planetary nebulae tend to have Zanstra temperatures TZ(Heii) > 90 kK. This is shown to be consistent with a large evolutionary lifetime, and the kinematic ages of the envelopes. Non-local thermodynamic equilibrium stellar atmospheric modelling also shows that levels of soft X-ray emission increase more rapidly than has previously been assumed, and are preferentially large in H2emitting sources. It is suggested that this may hold the key to explaining the strengths of the H2transitions.

Abstract Copyright: 2006 The Author. Journal compilation © 2006 RAS

Journal keyword(s): planetary nebulae: general - infrared: ISM

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PN Hb 5 PN 17 47 56.20 -29 59 39.6   10.50 10.78     ~ 274 0
2 NGC 6445 PN 17 49 15.0282384611 -20 00 34.159640072   18.9       ~ 302 0
3 NGC 6886 PN 20 12 42.83016 +19 59 22.6320   13.053 11.719     ~ 325 1
4 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 892 1
5 NGC 7048 PN 21 14 15.1876901775 +46 17 17.103824106           ~ 137 1

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