2002A&A...395..929R


Query : 2002A&A...395..929R

2002A&A...395..929R - Astronomy and Astrophysics, volume 395, 929-941 (2002/12-1)

The α-element abundances in the most oxygen-poor planetary nebula PN G135.9+55.9.

RICHER M.G., TOVMASSIAN G., STASINSKA G., JAMESON R.F., DOBBIE P.D., VEILLET C., GUTIERREZ C. and PRADA F.

Abstract (from CDS):

We present extensive new spectroscopy and imaging of PN G135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen abundance. We find that PN G135.9+55.9 has an oxygen abundance less than 1/50 of the solar value. Our models favour a value of 12+logO/H between 5.8 and 6.5dex, confirming that PN G135.9+55.9 is the most oxygen-poor planetary nebula known (Tovmassian et al., 2001A&A...370..456T]). We also derive Ne/O=0.5±0.3, S/O<0.094, and Ar/O<0.23. Although the value of Ne/O is nominally high, it need not imply that the progenitor of PN G135.9+55.9 converted any of its initial oxygen abundance to neon. The helium abundance appears to be very low, He/H∼0.08, but a precise determination will require a much more detailed study. We find that Hα/Hβ is lower than expected and perhaps variable, a finding for which we have no clear explanation.

Abstract Copyright:

Journal keyword(s): planetary nebulae: individual: PN G135.9+55.9

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 PN BoBn 1 PN 00 37 16.03 -13 42 58.6   16       ~ 129 1
2 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1046 0
3 M 42 HII 05 35 17.3 -05 23 28           ~ 3935 0
4 NAME Ori A MoC 05 38 -07.1           ~ 2870 0
5 WRAY 16-40 PN 09 18 01.3172902776 -54 39 29.165596128   14 15.00     ~ 76 0
6 SBSS 1150+599 PN 11 53 24.7392231288 +59 39 57.050391708   17.5       O(H)III-V 65 0
7 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 395 0
8 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 516 0
9 IC 4997 PN 20 20 08.7557973960 +16 43 53.698933380   11.94 11.15     [WC7/8] 537 0

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2022.10.01-07:30:49

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