2017A&A...606A.110I


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:15:52

2017A&A...606A.110I - Astronomy and Astrophysics, volume 606A, 110-110 (2017/10-1)

Distinguishing between symbiotic stars and planetary nebulae.

ILKIEWICZ K. and MIKOLAJEWSKA J.

Abstract (from CDS):

Context. The number of known symbiotic stars (SySt) is still significantly lower than their predicted population. One of the main problems in finding the total population of SySt is the fact that their spectrum can be confused with other objects, such as planetary nebulae (PNe) or dense HII regions. This problem is reinforced by the fact that in a significant fraction of established SySt the emission lines used to distinguish them from other objects are not present.
Aims. We aim at finding new diagnostic diagrams that could help separate SySt from PNe. Additionally, we examine a known sample of extragalactic PNe for candidate SySt.
Methods. We employed emission line fluxes of known SySt and PNe from the literature.
Results. We found that among the forbidden lines in the optical region of spectrum, only the [OIII] and [NII] lines can be used as a tool for distinguishing between SySt and PNe, which is consistent with the fact that they have the highest critical densities. The most useful diagnostic that we propose is based on HeI lines, which are more common and stronger in SySt than forbidden lines. All these useful diagnostic diagrams are electron density indicators that better distinguish PNe and ionized symbiotic nebulae. Moreover, we found six new candidate SySt in the Large Magellanic Cloud and one in M 81. If confirmed, the candidate in M 81 would be the farthest known SySt thus far.

Abstract Copyright: © ESO, 2017

Journal keyword(s): planetary nebulae: general - binaries: general - galaxies: individual: (LMC, SMC, M 33, M 81, NGC 300) - binaries: symbiotic - binaries: symbiotic - binaries: symbiotic

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
2 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1305 2
3 PN K 3-90 PN 01 24 58.6149768372 +65 38 36.096934863           ~ 41 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5134 1
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
6 SMP LMC 104 PN? 04 24 37.4946135341 -69 42 21.655731645     17.5     ~ 10 0
7 SMP LMC 16 PN 05 02 01.98 -69 48 53.6 16.646 17.927 16.623   18.121 ~ 28 0
8 SMP LMC 31 * 05 09 20.220 -67 47 25.02 17.001 17.815 17.117 15.470 16.582 ~ 42 0
9 [RP2006] 1413 PN 05 16 29.282 -68 18 11.65 20.038 19.960 18.972   20.272 ~ 11 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
11 LHA 120-N 141 PN 05 25 26.0132099910 -68 55 53.793577481 15.497 15.946 14.902 15.59 16.714 ~ 49 0
12 LHA 120-N 181 PN 05 49 38.8445387115 -69 10 00.313636061 16.535 18.892 18.039 15.060 18.165 ~ 25 0
13 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
14 PSK 403 HII 09 56 12.5 +69 07 40           ~ 6 0
15 HD 149427 PN 16 37 42.6988994632 -55 42 26.395035443   12.75 11.23     ~ 97 0
16 PN M 3-13 PN 17 41 36.62 -22 13 03.0           ~ 40 0
17 Hen 2-289 Sy* 17 49 48.22 -37 01 27.9   7.73       M8 159 1
18 PN M 2-24 PN 18 02 02.8949286491 -34 27 47.271639687   15.62 14.60 15.29   ~ 93 0
19 PN ShWi 5 Sy* 18 03 53.6908732520 -29 51 22.123996411       15.78   ~ 35 2
20 PN H 2-43 PN 18 12 47.9862555565 -28 19 59.746092882   12 14.20     ~ 67 0
21 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:15:52

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