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New planetary nebulae
from IPHAS
Romano L.M. Corradi 1,2
Antonio Mampaso 2
& Kerttu Viironen 2
1 Isaac Newton Group of Telescopes, La Palma
2 Instituto de Astrofisica de Canarias, Tenerife
The collaboration
ING, La Palma: Corradi, Evans, Greimel, Leisy, Lennon,
Skillen
UK: Barlow (UCL), Drew (PI), Unruh (Imperial), Gaensicke
(Warwick), Irwin (IoA), Knigge (Southampton), Masheder,
Morris, Phillipps (Bristol), Walton (IoA), Zijlstra
(Manchester)
Spain: Mampaso, Martin (IAC), Zurita (Granada)
The Netherlands: Groot (Nijmegen)
USA: Drake, Sokoloski & Steeghs (CfA)
Australia: Parker (AAO/Macquarie)
The survey
IPHAS = the INT/WFC Photometric H
Survey of the Northern Galactic Plane
Area: all l in Northern Plane; –5o < b < +5o (1800 deg2)
Mag. limit: to match UKST southern Ha survey (r ~ 20)
Observations: 2.5m Isaac Newton Telescope (La Palma) + Wide
Field Camera (4-CCD mosaic, fov 34x34 arcmin2, 0”.33 pix-1)
Ha (120 sec), Sloan r (30 sec) and i (10 sec) at two closely
overlapped pointings per field
22 clear weeks needed to complete. Started on Aug 2003.
The survey
Analysis: Pipeline reduction and point-source photometric and
astrometric catalogue generation by CASU.
IPHAS data are available immediately to astronomers from UK, Spain and
the Netherlands, and to ALL astronomers after 1 year from the date of
observing.
IPHAS web page:
http://astro.ic.ac.uk/Research/Halpha/North/index.html
IPHAS overview:
Drew et al. 2005, MNNRAS , in press
Scope of the survey
• Search and counts of all classes of Ha
emitting stars/nebulae  short-lived but
critical (birth, death, binarity, …) stages of
stellar evolution: supergiants, LBVs, preMS, WR, Be stars, interacting binaries,
PNe, HII regions, SNRs…
• Study of Galactic disc structure (stellar
populations, reddening)
Status of the survey
done/attempted
to do
Complete by the end of 2006
Expected products of the survey
• Photometric catalogue of 80 million objects
• Detection of ~50000 Ha-emitting objects
• ~700 new PNe (IPHASX JHHMMSS.s+DDMMSS)
complements the AAO/UKST Southern Survey
see Parker’s talk
IPHAS and the Planetary Nebulae
Searching techniques:
1. photometric catalogue  compact/small
nebulae
2. Visual inspection of mosaics  medium/large
nebulae
r-Ha
Automatic photometry: the IPHAS
colour-colour diagram
Drew et al. 2005
Pickles (1998) library of stellar spectra
r-i
Automatic
photometry:
the
IPHASdust
…and can
explore effects of
progressive
reddening: diagram
colour-colour
Drew et al. 2005
E(B-V)=
Ha EW
Validated by multi-object fibre
spectroscopy (6.5mMMT and 4.2mWHT)
lower limit for normal stars
Automatic photometry: compact PNe
r-Ha
66 candidates selected so far (follow-up spectroscopy in course)
r-i
1st PN discovered
Automatic photometry: compact PNe
IPHAS X052531.2+281946
anticentre Dgc=14-20 kpc!
see poster by Mampaso et al.
Looking at the images: large nebulae
• Mosaics of Ha-r images at different CCD
pixel binning values
• Visual inspection by several people: ~20
candidates selected so far (but area analysed
is very small)
A huge SN remnant: Sh 2-147
5o x 5o Ha-r
Some extended candidate PNe
produced by Anna Kovacevic & Albert Zijlstra
Conclusions
IPHAS, a new resource to detect PNe and Haemitting objects in the Galactic plane
• compact (young and/or faraway) PNe
• large (evolved) and low-surface brightness PNe