2005A&A...430..541C


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET10:20:18

2005A&A...430..541C - Astronomy and Astrophysics, volume 430, 541-548 (2005/2-1)

The ionizing star of the North America and Pelican nebulae.

COMERON F. and PASQUALI A.

Abstract (from CDS):

We present the results of a search for the ionizing star of the North America (NGC 7000) and the Pelican (IC 5070) nebulae complex. The application of adequate selection criteria to the 2MASS JHKS broad-band photometry allows us to narrow the search down to 19 preliminary candidates in a circle of 0.5° radius containing most of the L935 dark cloud that separates both nebulae. Follow-up near-infrared spectroscopy shows that most of these objects are carbon stars and mid-to-late-type giants, including some AGB stars. Two of the three remaining objects turn out to be later than spectral type B and thus cannot account for the ionization of the nebula, but a third object, 2MASS J205551.25+435224.6, has infrared properties consistent with it being a mid O-type star at the distance of the nebulae complex and reddened by AV≃9.6. We confirm its O5V spectral type by means of visible spectroscopy in the blue. This star has the spectral type required by the ionization conditions of the nebulae and photometric properties consistent with the most recent estimates of their distance. Moreover, it lies close to the geometric center of the complex that other studies have proposed as the most likely location for the ionizing star, and is also very close to the position inferred from the morphology of cloud rims detected in radio continuum. Given the fulfillment of all the conditions and the existence of only one star in the whole search area that satisfies them, we thus propose 2MASS J205551.25+435224.6 as the ionizing star of the North America/Pelican complex.

Abstract Copyright:

Journal keyword(s): ISM: HII regions - ISM: individual objects: NGC 7000 - ISM: individual objects: IC 5070 - ISM: individual objects: W80

Nomenclature: Table 1: [CP2005] NN (Nos 1-19).

Simbad objects: 26

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Number of rows : 26

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 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 762 0
2 IC 5070 HII 20 51.0 +44 22           ~ 172 1
3 2MASS J20524100+4349249 Y*O 20 52 41.01 +43 49 25.0           ~ 2 0
4 2MASS J20534291+4334398 * 20 53 42.9084117192 +43 34 39.943469142           ~ 1 0
5 2MASS J20540358+4402545 C* 20 54 03.5933473503 +44 02 54.487191033           ~ 1 0
6 2MASS J20541430+4405257 * 20 54 14.3063915746 +44 05 25.749120178           ~ 3 0
7 2MASS J20543978+4352155 C* 20 54 39.7812250555 +43 52 15.539857698           ~ 2 0
8 2MASS J20544433+4415102 Y*O 20 54 44.3436177545 +44 15 10.265563540           ~ 2 0
9 BC 252 C* 20 54 47.5532625726 +43 22 41.722894498   14.0       C 5 0
10 NAME NAN complex HII 20 55 +43.9           ~ 40 0
11 HD 199373 PM* 20 55 16.6554117548 +43 47 25.721043245   8.19 7.73     F5V 24 0
12 2MASS J20552151+4400279 C* 20 55 21.5194022987 +44 00 27.957316434           ~ 2 0
13 HD 199395 * 20 55 26.4849054191 +43 22 02.016303352   8.160 6.704     K4III 11 0
14 2MASS J20553429+4326371 Y*O 20 55 34.3016369966 +43 26 37.025036114       17.2   ~ 3 0
15 2MASS J20554159+4417060 * 20 55 41.6126724632 +44 17 06.028748683           ~ 1 0
16 2MASS J20554226+4352141 * 20 55 42.26 +43 52 14.1           ~ 1 0
17 2MASS J20554260+4355281 * 20 55 42.6152270300 +43 55 28.186461199           ~ 1 0
18 1RXS J205549.4+435216 X 20 55 49.5 +43 52 16           ~ 3 0
19 [SL2008c] 8 * 20 55 51.2553069671 +43 52 24.462712899     13.24     O3.5III(f*)+O8 15 1
20 2MASS J20555536+4321593 * 20 55 55.3762715949 +43 21 59.106255380           A 2 0
21 HD 199547 SB* 20 56 24.4491292197 +43 54 02.390047069 9.230 8.190 7.040     K0III 30 0
22 HD 199579 SB* 20 56 34.7781372461 +44 55 29.000769871 5.16 6.01 5.96     O6.5V((f))z 337 0
23 NAME Golf of Mexico DNe 20 56.8 +43 52           ~ 40 0
24 2MASS J20572570+4357349 C* 20 57 25.7175329615 +43 57 34.879286191           ~ 1 0
25 2MASS J20574153+4335555 * 20 57 41.5303573356 +43 35 55.515102341           ~ 2 0
26 NGC 7000 HII 20 58 47 +44 19.8           ~ 355 1

    Equat.    Gal    SGal    Ecl

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2019.11.19-10:20:18

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