2007A&A...472..847C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET08:48:53

2007A&A...472..847C - Astronomy and Astrophysics, volume 472, 847-854 (2007/9-4)

A study of the neglected Galactic HII region NGC 2579 and its companion ESO 370-9.

COPETTI M.V.F., OLIVEIRA V.A., RIFFEL R., CASTANEDA H.O. and SANMARTIM D.

Abstract (from CDS):

The Galactic HII region NGC2579 has stayed undeservedly unexplored due to identification problems which persisted until recently. Both NGC2579 and its companion ESO370-9 have been misclassified as planetary or reflection nebula, confused with each other and with other objects. Due to its high surface brightness, high excitation, angular size of few arcminutes and relatively low interstellar extinction, NGC2579 is an ideal object for investigations in the optical range. Located in the outer Galaxy, NGC2579 is an excellent object for studying the Galactic chemical abundance gradients. To present the first comprehensive observational study on the nebular and stellar properties of NGC2579 and ESO370-9, including the determination of electron temperature, density structure, chemical composition, kinematics, distance, and the identification and spectral classification of the ionizing stars, and to discuss the nature of ESO370-9. Long slit spectrophotometric data in the optical range were used to derive the nebular electron temperature, density and chemical abundances and for the spectral classification of the ionizing star candidates. Hα and UBV CCD photometry was carried out to derive stellar distances from spectroscopic parallax and to measure the ionizing photon flux. The chemical abundances of He, N, O, Ne, S, Cl, and Ar were obtained. Maps of electron density and radial velocity with a spatial resolution of 5''x5'' were composed from long slit spectra taken at different declinations. Three O stars classified as O5V, O6.5V, and O8V were found responsible for the ionization of NGC2579, while ESO370-9 is ionized by a single O8.5V star. The estimated mass of ionized gas of ≃25M indicates that ESO370-9 is not a planetary nebula, but a small HII region. A photometric distance of 7.6±0.9kpc and a kinematic distance of 7.4±1.4kpc were obtained for both objects. At the galactocentric distance of 12.8±0.7kpc, NGC2579 is one of the most distant Galactic HII regions for which direct abundance determinations have been accomplished.

Abstract Copyright:

Journal keyword(s): ISM: HII regions - ISM: planetary nebulae: general

Simbad objects: 16

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Number of rows : 16

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 M 42 HII 05 35 17.3 -05 23 28           ~ 3684 0
2 NAME Ori A MoC 05 38 -07.1           ~ 2638 0
3 HD 64854 * 07 55 54.2721830353 -00 16 49.065115250 8.512 9.243 9.398 9.457 9.539 B3/5III 21 0
4 HD 64887 * 07 56 06.6867706291 -00 20 42.351334516 9.131 9.351 9.419 9.450 9.492 B9IV 16 0
5 BRAN 133 HII 08 18 52.9 -36 12 15           ~ 13 0
6 CD-35 4502 * 08 20 52.9310805281 -36 12 50.808392525   11.70 10.25     K1III 11 1
7 DENIS J082054.8-361258 * 08 20 54.86 -36 12 58.9           ~ 2 0
8 ALS 16011 RNe 08 20 55 -36 13.0 13.7 13.92 13.11     ~ 7 0
9 NGC 2579 HII 08 20 55.3 -36 13 23           ~ 92 4
10 ESO 370-9 RNe 08 20 57 -36 13.7     13.00     ~ 2 2
11 NGC 2580 OpC 08 21 30 -30 17.7     9.7     ~ 12 0
12 NAME AH03 J0822-36 OpC 08 22 08 -36 24.3           ~ 6 1
13 PG 0918+029 HS* 09 21 28.2141418281 +02 46 02.253964445 11.975 13.056 13.327 13.456 13.615 sdB1VIIHe6 100 0
14 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 597 0
15 PG 1323-086 HS* 13 25 39.4670509324 -08 49 19.068159971 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 134 1
16 BD+00 3222 * 14 40 50.9412942459 -00 23 36.825370166 12.729 11.150 9.786 9.056 8.412 K0III 14 0

    Equat.    Gal    SGal    Ecl

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