# 2006A&A...454..527G

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 Query : 2006A&A...454..527G

2006A&A...454..527G - Astronomy and Astrophysics, volume 454, 527-536 (2006/8-1)

A search for photometric variability of hydrogen-deficient planetary-nebula nuclei.

GONZALEZ PEREZ J.M., SOLHEIM J.-E. and KAMBEN R.

Abstract (from CDS):

We searched for photometric variability in a sample of hot, hydrogen-deficient planetary nebula nuclei (PNNi) with PG 1159'' or O VI'' spectral type, most of them embedded in a bipolar or elliptical planetary nebula envelope (PNe). These characteristics may indicate the presence of a hidden close companion and an evolution affected by episodes of interaction between them. We obtained time-series photometry from a sample of 11 candidates using the Nordic Optical Telescope (NOT) with the Andalucia Faint Object Spectrograph and Camera (ALFOSC), modified with our own control software to be able to observe in a high-speed multi-windowing mode. The data were reduced on-line with the real time photometry (RTP) code, which allowed us to detect periodic variable stars with small amplitudes from CCD data in real time. We studied the properties of the observed modulation frequencies to investigate their nature. We report the first detection of low-amplitude pulsations in the PNNi VV 47, NGC 6852, and Jn 1. In addition, we investigated the photometric variability of NGC 246. Time-series analysis shows that the power spectra of VV 47, NGC 6852, and NGC 246 are variable on time scales of hours. Power spectra from consecutive nights of VV 47 and NGC 6852 show significant peaks in different frequency regions. The same type of variability is present in NGC 246 in 2 observing runs separated by 3 days. Changes are also found in the power spectra of VV 47 and NGC 246 during the same night. The VV 47 power spectra are peculiar since they present modulation frequencies in a wide range from 175 to 7600µHz. This is different from the previously known pulsating PNNi where no frequencies are found above ∼3000µHz. The high-frequency modulation observed in VV 47 may be due to g-modes triggered by the ε-mechanism, observed for the first time.

Journal keyword(s): stars: oscillations - stars: individual: NGC 246 - stars: individual: VV 47 - stars: individual: NGC 6852 - stars: individual: Jn 1 - stars: AGB, post-AGB

Full paper

 Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 246 PN 00 47 03.3420341616 -11 52 18.971126076 10.15 11.52 11.76 12.18   PG1159 470 0
2 M 76 PN 01 42 19.6557728208 +51 34 31.534970052     17.48   17.69 DOZ 368 2
3 PN IsWe 1 PN 03 49 05.9053580088 +50 00 14.898517992 15.71 16.374 16.523 16.576 16.644 DOZ 61 1
4 NGC 1501 PN 04 06 59.3920909320 +60 55 14.278542024   15.17 13.0     [WO4] 291 1
5 NGC 2371 PN 07 25 34.6883929008 +29 29 26.430252072   14.48 13.5     Oe 364 0
6 PN A66 21 PN 07 29 02.7096654192 +13 14 48.587555184   15.67 15.99     DOZ 187 0
7 PN ARO 121 PN 07 57 51.6169237320 +53 25 16.950484848   16.775 17.128 17.288 17.501 DQ 158 1
8 PN A66 30 PN 08 46 53.4639874872 +17 52 46.369394580   14.23 14.30 13.47   [WC5] 405 0
9 NGC 2867 PN 09 21 25.3832468160 -58 18 40.626683604   12.0 10.30     [WO2] 297 0
10 PN Lo 4 PN 10 05 45.7880109408 -44 21 33.523482384           sdO 133 1
11 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 479 0
12 V* AM CVn CV* 12 34 54.6231062664 +37 37 44.120620056   14.02 14.13 14.47   DBnnp 396 0
13 NGC 5189 PN 13 33 32.8780414224 -65 58 27.041428272   14.1 14.5   14.35 [WO1] 309 2
14 V* CW Boo WD* 14 58 32.6381816376 +10 08 18.108688128   15.89       DBA 54 0
15 PG 1520+525 PN 15 21 46.5635130432 +52 22 03.867341340   15.56 16.6     PG1159 108 1
16 PN A66 43 PN 17 53 32.2767758208 +10 37 24.210757560   14.53 14.71     O7fk 133 0
17 PN K 1-16 PN 18 21 52.1086837968 +64 21 53.406292104   14.44 14.96 15.26   PG1159 245 0
18 NGC 6765 PN 19 11 06.5583234216 +30 32 43.674073296           PG1159 70 1
19 NGC 6852 PN 20 00 39.2100674640 +01 43 40.921293540   17.70       PG1159 64 1
20 NGC 6905 PN 20 22 22.9919225472 +20 06 16.285052088   16.3 14.5     [WC3] 340 0
21 MWP 1 PN 21 17 08.2817782392 +34 12 27.415995372     12.33     PG1159 182 0
22 PN A66 78 PN 21 35 29.3816259120 +31 41 45.449196108   13.04 13.25     [WC5] 321 0
23 NGC 7094 PN 21 36 52.9687364088 +12 47 19.099274136     13.35     ~ 185 0
24 PN Jn 1 PN 23 35 53.3214838680 +30 28 06.336745212   15.52 15.62     DOZ 104 0

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2023.03.28-04:07:00