2001A&A...367..973N


Query : 2001A&A...367..973N

2001A&A...367..973N - Astronomy and Astrophysics, volume 367, 973-982 (2001/3-1)

Spectroscopic investigation of old planetaries. V. Distance scales.

NAPIWOTZKI R.

Abstract (from CDS):

We use the results of our recent NLTE model atmosphere analysis of central stars of old planetary nebulae (PN) to calculate distances. We perform a comparison with three other methods (trigonometric parallaxes, interstellar NaD lines, and Shklovsky distances) and discuss the problem of the PNe distance scale. The result of the comparison of our spectroscopic distances with the trigonometric distances is that the spectroscopic distances are 55% larger. Since using trigonometric parallaxes with large relative measurement errors can introduce systematic errors, we carried out a Monte Carlo simulation of the biases introduced by selection effects and measurement errors. It turns out that a difference between both distance scales of the observed size is expected for the present day data if the underlying distance scales are identical. Thus our finding is essentially a confirmation of the spectroscopic distance scale! Good agreement is found between the spectroscopic distances and distances derived from the interstellar NaD lines. All three independent methods of distance measurement indicate that the widely used ``statistical'' distance scales of the Shklovsky type are too short for old PNe. A correlation with nebular radii exists. The most likely explanation is an underestimate of the nebula masses for large PN. Implications for the nebula masses are discussed. Estimates of the PNe space density and birthrate, which are based on Shklovsky type distances, therefore give too large values.

Abstract Copyright:

Journal keyword(s): stars: distances - planetary nebulae: general - white dwarfs - stars: fundamental parameters

Simbad objects: 27

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Number of rows : 27
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 PG 0057+155 HS* 00 59 56.6673699744 +15 44 13.740284580   12.02 12.32     sdB0.2VIIIpHe8 126 1
2 PN HDW 1 PN 01 07 07.6233410040 +73 33 23.447679408   16.308 16.439 16.452 16.482 DA 46 0
3 SH 2-188 PN 01 30 33.1778575512 +58 24 50.325485868   17.424 17.447 17.398 17.376 DAO.6 102 1
4 PN HDW 3 PN 03 27 15.4128207000 +45 24 20.390808888   17.084 17.187 17.218 17.234 DAO.6 45 1
5 PN HaWe 5 PN 03 45 26.6811762816 +37 48 52.217867988   17.321 17.439 17.471 17.528 DA1.3 27 1
6 SH 2-216 PN 04 43 21.2638228056 +46 42 05.835192876   12.50 12.87 13.04   DAO.6 161 2
7 PN A66 7 PN 05 03 07.5327419904 -15 36 22.720814352 13.99 15.190 15.495 15.632 15.818 DAO.6 114 0
8 PN HDW 4 PN 05 37 56.2344221784 +55 32 15.751157604   16.310 16.540 16.638 16.739 DA1.0 37 1
9 PN G197.4-06.4 PN 05 59 24.8669398728 +10 41 40.411774572   16.958 17.226 17.338 17.489 DA.3 47 1
10 PN PuWe 1 PN 06 19 33.9428547048 +55 36 43.907538204   15.291 15.545 15.662 15.792 DAO.5 86 1
11 PN K 2-2 PN 06 52 23.1654838296 +09 57 55.772161416   13.977 14.263 14.390 14.553 sdO 76 0
12 PN A66 31 PN 08 54 13.1641145952 +08 53 52.941471000   15.201 15.544 15.693 15.831 sdO6 133 0
13 M 97 PN 11 14 47.7122947800 +55 01 08.482832076   15.414 15.777 15.960 16.194 ~ 343 1
14 PN A66 39 PN 16 27 33.7199223168 +27 54 33.471380376   15.27 15.60     DAO.70 128 0
15 PN DeHt 2 PN 17 41 40.9000616808 +03 06 57.542033772     14.95     ~ 34 0
16 PN A66 43 PN 17 53 32.2767758208 +10 37 24.210757560   14.53 14.71     O7fk 136 0
17 SH 2-68 PN 18 24 58.4294414904 +00 51 36.021249072   16.0 16.5     DAOZ.6 130 1
18 M 57 PN 18 53 35.0967659112 +33 01 44.883287544   15.405 15.769 15.901 16.062 DA(O?) 830 2
19 IC 1295 PN 18 54 37.1482406280 -08 49 37.419993444           DAO.56 94 1
20 PN A66 61 PN 19 19 10.2027282696 +46 14 51.973821276   17.05 17.39     DAO.57 59 0
21 PN HDW 11 PN 19 31 07.2261690827 -03 42 32.273784585     16.6     ~ 33 0
22 M 27 PN 19 59 36.3631850088 +22 43 16.312059552   13.749 14.089 14.247 14.405 DAO.6 588 0
23 PN A66 74 PN 21 16 52.3412522928 +24 08 51.095310720   16.91 17.11     DAO 71 1
24 NGC 7094 PN 21 36 52.9687364088 +12 47 19.099274136     13.650 13.775   sdB/sdO 193 0
25 WD 2218+706 WD* 22 19 33.6826662264 +70 56 03.182775504   15.268 15.495 15.568 15.631 DA.7 74 1
26 NGC 7293 PN 22 29 38.5454047152 -20 50 13.747242408 11.894 13.158 13.524 13.689 13.898 DAO.5 942 0
27 LBN 120.29+18.39 PN 23 45 02.268 +80 56 59.62     14.74     ~ 44 0

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