2015A&A...579A..86W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:36:01

2015A&A...579A..86W - Astronomy and Astrophysics, volume 579A, 86-86 (2015/7-1)

Improved spectral descriptions of planetary nebulae central stars.

WEIDMANN W.A., MENDEZ R.H. and GAMEN R.

Abstract (from CDS):

At least 492 central stars of Galactic planetary nebulae (CSPNs) have been assigned spectral types. Since many CSPNs are faint, these classification efforts are frequently made at low spectral resolution. However, the stellar Balmer absorption lines are contaminated with nebular emission; therefore in many cases a low-resolution spectrum does not enable the determination of the H abundance in the CSPN photosphere. Whether or not the photosphere is H deficient is arguably the most important fact we should expect to extract from the CSPN spectrum, and should be the basis for an adequate spectral classification system. Our purpose is to provide accurate spectral classifications and contribute to the knowledge of central stars of planetary nebulae and stellar evolution. We have obtained and studied higher quality spectra of CSPNs described in the literature as weak emission-line star (WELS). We provide descriptions of 19 CSPN spectra. These stars had been previously classified at low spectral resolution. We used medium-resolution spectra taken with the Gemini Multi-Object Spectrograph (GMOS). We provide spectral types in the Morgan-Keenan (MK) system whenever possible. Twelve stars in our sample appear to have normal H rich photospheric abundances, and five stars remain unclassified. The rest (two) are most probably H deficient. Of all central stars described by other authors as WELS, we find that at least 26% of them are, in fact, H rich O stars, and at least 3% are H deficient. This supports the suggestion that the denomination WELS should not be taken as a spectral type, because, as a WELS is based on low-resolution spectra, it cannot provide enough information about the photospheric H abundance.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general - stars: emission-line, Be - stars: evolution - stars: early-type

Simbad objects: 38

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Number of rows : 38

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 IC 351 PN 03 47 32.9811922252 +35 02 48.633107981   13.11 12.27 14.35   Of(H) 251 0
2 NGC 1535 PN 04 14 15.7689951134 -12 44 21.934169738   12.01 12.82     sdO3: 500 0
3 Jonckheere 320 PN 05 05 34.2774523754 +10 42 22.923399381           O3V(f) 273 2
4 IC 418 PN 05 27 28.2060343141 -12 41 50.282659007   9.78 13.0     O7fp 1000 2
5 WRAY 16-8 PN 07 47 20.0415822672 -51 15 03.433241648   11.9 12.80     Of(H) 106 0
6 NGC 3242 PN 10 24 46.1335198512 -18 38 32.294434711   11.83 12.15     ~ 798 1
7 HD 93129A SB* 10 43 57.4584179931 -59 32 51.395115271 6.46 7.478 7.310 7.84   O2If* 146 0
8 NGC 4361 PN 12 24 30.7509091298 -18 47 05.564628299   12.8 13.2     [WC] 384 1
9 WRAY 16-135 PN 13 45 22.3674292595 -71 28 56.136996109   12.9 12.80     Of-WR(H) 71 0
10 NGC 5307 PN 13 51 03.322 -51 12 20.77   11.5 10     O3.5V 167 0
11 CPD-51 6744 PN 14 18 08.8856504204 -52 10 39.518062758   12.39 11.98     [WC] 146 0
12 HD 138403 PN 15 37 11.2073858949 -71 54 52.885863880   10.24 10.47 11.01   O8(f)ep 254 0
13 NGC 5979 PN 15 47 41.16 -61 13 05.6     12.10     wels 95 0
14 HD 141969 PN 15 56 01.6946071958 -66 09 09.229322144 12.37 10.75 10.95 10.88   BC0Ibe 202 0
15 IC 4634 PN 17 01 33.5805836299 -21 49 33.002375687   12.3 11.3     O3If 265 0
16 NGC 6309 PN 17 14 04.3073336607 -12 54 37.891046946   11.6       O(He) 297 1
17 NGC 6337 PN 17 22 15.6721752443 -38 29 01.735111388     12.00     wels 129 0
18 PN Cn 1-3 PN 17 26 12.3117406163 -44 11 25.543466569   12.55 12.30 13.26   wels? 42 0
19 PN Tc 1 PN 17 45 35.2877697798 -46 05 23.713203258   11.30 11.49     PCyg 240 0
20 PN M 1-26 PN 17 45 57.6652777318 -30 12 00.874208077   12.89 12.08 12.00   [WR] 203 0
21 PN H 1-35 PN 17 49 13.9251055629 -34 22 52.842287784     12.90     wels? 107 0
22 NGC 6543 PN 17 58 33.4042519454 +66 37 58.748961810   11.09 11.28     [WC] 1121 1
23 PN M 3-20 PN 17 59 19.35 -28 13 48.2     14.80     Of 76 0
24 NGC 6572 PN 18 12 06.3140077888 +06 51 13.030152295   9.3 10.8     [WC] 738 0
25 PN M 2-33 PN 18 15 06.5633998847 -30 15 33.260690288       14.61 14.03 O5f(H) 99 0
26 PN Cn 3-1 PN 18 17 34.1015205519 +10 09 03.306489008   12.93 12.49 12.35   07Ib(f) 207 0
27 IC 4699 PN 18 18 32.0453780375 -45 59 01.734612109   13.83 12.71 15.51 15.09 O3V((f)) 93 0
28 PN M 1-46 PN 18 27 56.3174034794 -15 32 54.437082009     12.83     O(H)7I(fc) 116 0
29 PN M 1-53 PN 18 35 48.267 -17 36 08.71           O3If 64 0
30 PN Hb 7 PN 18 55 37.8033181669 -32 15 48.541448869   12.58 11.65 13.61   O3 89 0
31 LAWD 74 WD* 19 20 34.9229875534 -07 40 00.066805378 11.553 12.345 12.290 12.229 12.164 DBQA5 197 0
32 PN M 1-73 PN 19 41 09.2938857237 +14 56 58.982287390           O3.5If 72 1
33 NGC 6818 PN 19 43 58.022 -14 09 13.44     9.3     ~ 339 1
34 IRAS 19417+1701 PN 19 43 59.5110389170 +17 09 00.957899325   11.2   10.6   ~ 42 0
35 NGC 6879 PN 20 10 26.70 +16 55 21.4     14.8     O3f(He) 145 0
36 NGC 6891 PN 20 15 08.8436589777 +12 42 15.585470301   12.11 12.51     O3Ib(f*) 383 0
37 IC 4997 PN 20 20 08.7615653034 +16 43 53.993812400   11.94 11.15     [WC7/8] 528 0
38 NGC 7009 PN 21 04 10.8153350719 -11 21 48.581808296   12.48 12.07     ~ 962 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:36:01

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