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.
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New planetary nebulaefrom 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, pre-MS, WR, Be stars, interacting binaries, PNe, HII regions, SNRs…
• Study of Galactic disc structure (stellar populations, reddening)
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
Pickles (1998) library of stellar spectra
Automatic photometry: the IPHAS colour-colour diagram
r-i
r-H
aDrew et al. 2005
…and can explore effects of progressive dust reddening:
lower limit for normal stars
Automatic photometry: the IPHAS colour-colour diagram
Ha EWValidated by multi-object fibre
spectroscopy (6.5mMMT and 4.2mWHT)
E(B-V)=
Drew et al. 2005
Automatic photometry: compact PNe
66 candidates selected so far (follow-up spectroscopy in course)
r-i
r-H
a
Automatic photometry: compact PNe
see poster by Mampaso et al.
IPHAS X052531.2+281946 anticentre Dgc=14-20 kpc!
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)
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