J/A+A/495/447 PN and HII regions in NGC6822 (Hernandez-Martinez+, 2009)
Emission line objects in NGC 6822. New planetary nebula candidates.
Hernandez-Martinez L., Pena M.
<Astron. Astrophys., 495, 447-455 (2009)>
=2009A&A...495..447H 2009A&A...495..447H
ADC_Keywords: Galaxies, nearby ; Planetary nebulae ; H II regions ; Spectroscopy
Keywords: ISM: HII regions - ISM: planetary nebulae: general -
galaxies: individual: NGC 6822 (DDO 209)
Abstract:
Images obtained with the CTIO 4-m telescope and the MOSAIC-2 wide
field camera in [OIII] 5007 and Halpha on-band and off-band
filters are analyzed to search for emission line objects in the dwarf
galaxy NGC 6822. In particular we search for planetary nebula (PN)
candidates. In addition, imaging and spectroscopy of a sub-sample of
objects obtained with the ESO VLT and FORS 2 spectrograph are used to
calibrate the MOSAIC imaging.
In the continuum-subtracted images, a large number of line emission
regions were detected, for which we measured instrumental magnitudes
in all the filters. The [OIII] 5007 and Halpha+[NII] magnitudes were
calibrated with the spectroscopy.
Description:
NGC 6822 was observed on 2005 September 4 and October 9, using the
CTIO 4-m Blanco telescope with the MOSAIC 2 camera.
Spectrophotometric data for several PN candidates and compact HII
regions were obtained with the ESO Very LargeTelescope FORS 2 in MXU
mode, on 2006 August 20 and 21.
On 2006 August 20 and 22, we observed NGC 6822 with the ESO VLT UT1
(Antu) telescope, in Cerro Paranal, Chile. The FORS 2 (Focal Reducer
Spectrograph 2) was used to obtain spectroscopic data to characterize
the interstellar medium in NGC 6822 (program ID 077.B-0480).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 116 72 Characteristics of emission line objects in
NGC 6822
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See also:
J/AJ/109/173 : BVR photometry of NGC 6822 (Marconi+ 1995)
J/AJ/121/2020 : CTIO and WFPC2 photometry in NGC 6822 (Bianchi+, 2001)
J/AJ/123/832 : C star population in NGC 6822 (Letarte+, 2002)
J/AJ/128/2815 : ARAUCARIA: NGC 6822 Cepheid variables (Pietrzynski+, 2004)
J/A+A/450/873 : ARAUCARIA: NGC 6822 bright variables (Mennickent+, 2006)
J/ApJ/647/1056 : ARAUCARIA: NGC 6822 Cepheid variables (Gieren+, 2006)
J/A+A/429/837 : IJKs photometry of late-type stars in NGC 6822 (Cioni+, 2005)
J/A+A/431/1189 : BV photometry of NGC 6822 variables (Baldacci+, 2005)
J/A+A/454/717 : Near-IR photometry of C & AGB stars in NGC 6822 (Kang+, 2006)
J/A+A/456/905 : JKs, i'g'r' photometry of C stars in NGC 6822 (Demers+, 2006)
J/AJ/132/378 : HST and UV photometry of NGC 6822 (Bianchi+, 2006)
J/AJ/132/1372 : Chandra observation of NGC 6822 (Tennant+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- [HP2009] Object Name (2)
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 31 F4.1 arcsec DEs Declination (J2000)
33 A1 --- l_mi(5007) Limit flag on mi(5007)
34- 38 F5.2 mag mi(5007) Instrumental magnitude in [OIII]5007 image
40 A1 --- l_mi(D51) Limit flag on mi(D51)
41- 45 F5.2 mag mi(D51) ?=- Instrumental magnitude in D51 (5130Å)
image
47- 51 F5.2 mag mi(Ha) Instrumental magnitude in
Ha=Hα+[NII]6548,6583 image
53 A1 --- l_mi(Ha8) Limit flag on mi(Ha8)
54- 58 F5.2 mag mi(Ha8) ?=- Instrumental magnitude in Ha+8 (6650Å)
image
60- 65 F6.2 [mW/m2] lF5007 ? [OIII]5007Å flux from spectroscopy
67 A1 --- l_lF5007a Limit flag on logF5007a
68- 73 F6.2 [mW/m2] lF5007a ? 5007Å flux calculated from equation
in Fig.3a (logF5007=-[4.82+0.44mi(5007)])
75- 80 F6.2 [mW/m2] lHa ? Hα+[NII] flux from spectroscopy
82- 87 F6.2 [mW/m2] lHab Hα+[NII] flux calculated from equation
in Fig. 3b (logHa=-[4.94+0.44mi(Ha)])
89- 92 F4.2 --- 5007/Ha ?=- ([OIII]5007)/(Hα+[NII]) flux ratio
94- 99 A6 --- OName Other name (1)
101-116 A16 --- Com Comments
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Note (1): Previous ID from Leisy et al. (2005A&A...436..437L 2005A&A...436..437L),
Richer and McCall (2007ApJ...658..328R 2007ApJ...658..328R) and
Killen and Dufour (1982PASP...94..444K 1982PASP...94..444K)
PN NN = [LCM2005] PN NN in Simbad
HII NN = [LCM2005] HII NN in Simbad
KD_SNN = KD SNN in Simbad
KD_DNN = KD DNN in Simbad
Note (2): Object name may designate a planetary nebula (PN), a
HII region (HII), or Hα emission (Ha).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Jun-2009