Candidate planetary nebulae in the IPHAS photometric catalogue*
Instituto de Astrofísica de Canarias (IAC), C/Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain e-mail: email@example.com
2 Institut für Physik, Karl-Franzens Universität Graz, Universitätsplatz 5,8010 Graz, Austria
3 Instituto Nacional de Astrofísica, Óptica y Electrónica INAOE, Apdo Postal 51 y 216, 72000 Puebla, Pue., Mexico
4 Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester, M13 9PL, UK
5 Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
6 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
7 Department of Physics, Macquarie University, Sydney, Australia
8 Observatoire Astronomique, Université de Strasbourg, 67000, Strasbourg, France
9 Instituto de Geofísica y Astronomía, Calle 212, N. 2906, CP 11600, La Habana, Cuba
Accepted: 8 June 2009
Context. We have carried out a semi-automated search for planetary nebulae (PNe) in the INT photometric H-alpha survey (IPHAS) catalogue. We present the PN search and the list of selected candidates. We cross correlate the selected candidates with a number of existing infrared galactic surveys in order to gain further insight into the nature of the candidates. Spectroscopy of a subset of objects is used to estimate the number of PNe present in the entire candidate list.
Aims. The overall aim of the IPHAS PN project is to carry out a deep census of PNe in the northern Galactic plane, an area where PN detections are clearly lacking.
Methods. The PN search is carried out on the IPHAS photometric catalogue. The candidate selection is based on the IPHAS and 2MASS/UKIDSS colours of the objects and the final candidate selection is made visually.
Results. From the original list of ~600 million IPHAS detections we have selected a total of 1005 objects. Of these, 224 are known objects, leaving us with 781 PN candidates. Based on the initial follow-up spectroscopy, we expect the list to include very young and proto-PNe in addition to genuine, normal PNe (~16%) and emission line objects other than PNe. We present additional criteria to select the most probable PN candidates from our candidate list.
Key words: surveys / ISM: planetary nebulae: general / stars: binaries: symbiotic
© ESO, 2009