2011A&A...531A.158M


Query : 2011A&A...531A.158M

2011A&A...531A.158M - Astronomy and Astrophysics, volume 531A, 158-158 (2011/7-1)

Discovery of close binary central stars in the planetary nebulae NGC 6326 and NGC 6778.

MISZALSKI B., JONES D., RODRIGUEZ-GIL P., BOFFIN H.M.J., CORRADI R.L.M. and SANTANDER-GARCIA M.

Abstract (from CDS):

We present observations proving the close binary nature of the central stars belonging to the planetary nebulae (PNe) NGC 6326 and NGC 6778. Photometric monitoring reveals irradiated lightcurves with orbital periods of 0.372 and 0.1534 days, respectively, constituting firm evidence that they passed through a common-envelope (CE) phase. Unlike most surveys for close binary central stars (CSPN) however, the binary nature of NGC 6326 was first revealed spectroscopically and only later did photometry obtain an orbital period. Gemini South observations revealed a large 160km/s shift between the nebula and emission lines of C III and N III well known to originate from irradiated atmospheres of main-sequence companions. These so-called weak emission lines are fairly common in PNe and measurement of their radial velocity shifts in spectroscopic surveys could facilitate the construction of a statistically significant sample of post-CE nebulae. There is growing evidence that this process can be further accelerated by pre-selecting nebulae with traits of known post-CE nebulae. Both NGC 6326 and NGC 6778 were selected for their rich attribution of low-ionisation filaments and collimated outflows, thereby strengthening the connection between these traits and post-CE CSPN.

Abstract Copyright:

Journal keyword(s): planetary nebulae: individual: PN G338.1-08.3 - planetary nebulae: individual: PN G034.5-06.7 - binaries: general - binaries: eclipsing

Simbad objects: 12

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Number of rows : 12
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 A66 30 PN 08 46 53.4639874872 +17 52 46.369394580   14.23 14.30 13.47   [WC5] 401 0
2 PN K 1-2 PN 08 57 45.9621412752 -28 57 36.577846476           ~ 113 1
3 NGC 6326 PN 17 20 46.252 -51 45 15.17   12.83 11.53 16.00 15.16 O(H)5-8((fc)) 143 0
4 NGC 6337 PN 17 22 15.6721413768 -38 29 01.735593252     12.00     wels 134 0
5 PN A66 41 PN 17 29 02.0258857104 -15 13 04.482114960   16.06 15.95     sdO 136 1
6 PN Lo 16 PN 17 35 41.8805265456 -40 11 26.481440724     16.14     O(H)3-4Vz((fc)) 31 0
7 PN A66 46 PN 18 31 18.5910709560 +26 56 12.110750088   14.88 15.07     O9k 165 0
8 NAME Ethos 1 PN 19 16 31.4893892688 +36 09 47.679159096           ~ 28 0
9 PN A66 58 PN 19 18 20.476 +01 46 59.62           [WC4] 303 0
10 NGC 6778 PN 19 18 25.0 -01 35 47     14.8     ~ 250 0
11 IRAS 19417+1701 PN 19 43 59.5114618200 +17 09 00.963778248   11.2   10.6   ~ 57 0
12 PN A66 78 PN 21 35 29.3816259120 +31 41 45.449196108   13.04 13.25     [WC5] 317 0

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2022.08.17-22:36:15

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