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


Query : 2015A&A...579A..86W

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 - 2022
#notes
1 IC 351 PN 03 47 32.9806443144 +35 02 48.639127308   13.11 12.27 14.35   Of(H) 254 0
2 NGC 1535 PN 04 14 15.7689913368 -12 44 21.932484324   12.01 12.82     sdO3: 508 0
3 Jonckheere 320 PN 05 05 34.2777790632 +10 42 22.924778148           O3V(f) 278 0
4 IC 418 PN 05 27 28.2059533560 -12 41 50.282287764   9.405 9.010 10.118   O7fp 1019 2
5 WRAY 16-8 PN 07 47 20.0414144496 -51 15 03.432601872   11.9 12.80     Of(H) 110 0
6 NGC 3242 PN 10 24 46.1335521792 -18 38 32.296857792   11.83 12.15     ~ 812 1
7 HD 93129A SB* 10 43 57.4587319296 -59 32 51.394897284 6.46 7.478 7.310 7.84   O2If* 157 0
8 NGC 4361 PN 12 24 30.7510527528 -18 47 05.567336304   12.8 13.2     [WC] 389 1
9 WRAY 16-135 PN 13 45 22.3626824688 -71 28 56.118205632   12.9 12.80     Of-WR(H) 73 0
10 NGC 5307 PN 13 51 03.2580878376 -51 12 20.835744984   11.5 10     O3.5V 172 0
11 CPD-51 6744 PN 14 18 08.8853838456 -52 10 39.516692592   12.39 11.98     [WC] 149 0
12 HD 138403 PN 15 37 11.2073139768 -71 54 52.887104280   10.24 10.47 11.01   O8(f)ep 259 0
13 NGC 5979 PN 15 47 41.1732637320 -61 13 05.549514276     12.10     wels 99 0
14 HD 141969 PN 15 56 01.6950076104 -66 09 09.231820920 12.37 10.75 10.95 10.88   BC0Ibe 210 0
15 IC 4634 PN 17 01 33.5816774904 -21 49 33.015515916   12.3 11.3     O3If 272 0
16 NGC 6309 PN 17 14 04.3074600360 -12 54 37.893271860   11.6       O(He) 305 1
17 NGC 6337 PN 17 22 15.6721413768 -38 29 01.735593252     12.00     wels 134 0
18 PN Cn 1-3 PN 17 26 12.3147580152 -44 11 25.512172476   12.55 12.30 13.26   wels? 44 0
19 PN Tc 1 PN 17 45 35.2879212240 -46 05 23.717122728   11.30 11.49     PCyg 250 0
20 PN M 1-26 PN 17 45 57.6673214328 -30 12 00.766253160   12.89 12.08 12.00   [WR] 207 0
21 PN H 1-35 PN 17 49 13.9398459192 -34 22 52.812575256     12.90     wels? 111 0
22 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1145 1
23 PN M 3-20 PN 17 59 19.35 -28 13 48.2     14.80     Of 78 0
24 NGC 6572 PN 18 12 06.3181909152 +06 51 13.027935240   9.3 10.8     [WC] 746 0
25 PN M 2-33 PN 18 15 06.5634327720 -30 15 33.265211580       14.61 14.03 O5f(H) 102 0
26 PN Cn 3-1 PN 18 17 34.1015035728 +10 09 03.304908396   12.93 12.49 12.35   07Ib(f) 215 0
27 IC 4699 PN 18 18 32.0450169624 -45 59 01.735217988   13.83 12.71 15.51 15.09 O3V((f)) 96 0
28 PN M 1-46 PN 18 27 56.3175434256 -15 32 54.434037264     12.83     O(H)7I(fc) 122 0
29 PN M 1-53 PN 18 35 48.267 -17 36 08.71           O3If 66 0
30 PN Hb 7 PN 18 55 37.8037363176 -32 15 48.553611372   12.58 11.65 13.61   O3 92 0
31 LAWD 74 WD* 19 20 34.9229289504 -07 40 00.065957592 11.553 12.345 12.290 12.229 12.164 DBQA5 213 0
32 PN M 1-73 PN 19 41 09.2937490896 +14 56 58.980006096           O3.5If 76 1
33 NGC 6818 PN 19 43 58.022 -14 09 13.44     9.3     ~ 344 1
34 IRAS 19417+1701 PN 19 43 59.5114618200 +17 09 00.963778248   11.2   10.6   ~ 57 0
35 NGC 6879 PN 20 10 26.70 +16 55 21.4     14.8     O3f(He) 147 0
36 NGC 6891 PN 20 15 08.8435405584 +12 42 15.584146740   12.11 12.51     O3Ib(f*) 390 0
37 IC 4997 PN 20 20 08.7557973960 +16 43 53.698933380   11.94 11.15     [WC7/8] 537 0
38 NGC 7009 PN 21 04 10.8155187648 -11 21 48.580157556   12.48 12.07     ~ 981 1

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2022.09.24-18:35:00

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