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.

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)

Status of the surveydone/attempted

Complete by the end of 2006

to do

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

1st PN discovered

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)

A huge SN remnant: Sh 2-147

5o x 5o Ha-r

produced by Anna Kovacevic & Albert Zijlstra

Some extended candidate PNe

Conclusions

IPHAS, a new resource to detect PNe and Ha-emitting objects in the Galactic plane

• compact (young and/or faraway) PNe

• large (evolved) and low-surface brightness PNe