Discovery of New Faint Northern Galactic Planetary Nebulae

 

Agnès Acker,¹ Henri M. J. Boffin,² Nicolas Outters,³ Brent Miszalski,^4,5 Laurence Sabin,⁶ Pascal Le Dû,⁷ and Filipe Alves⁸

 

¹ Observatoire de Strasbourg, 11 rue de l'universite, F–67000 Strasbourg, France (agnes.acker@astro.unistra.fr).

² ESO, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago, Chile (hboffin@eso.org).

³ Orange Observatory, 50 impasse des Gorges, F–74800 Saint–Sixt, France (nico.outters@libertysurf.fr).

^4,5 South African Astronomical Observatory and Southern African Large Telescope Foundation, PO Box 9, Observatory 7935, South Africa (brent@saao.ac.za).

⁶ Instituto de Astronomia, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800 Ensenada, B. C., México (lsabin@astrosen.unam.mx).

⁷ 21 route de Kermerrien, F–29840 Porspoder, France (ledu@shom.fr).

⁸ CROW–Portalegre, Atalaia group, Portugal (manalokos@gmail.com).

 

Received 2012 March 15.
Accepted 2012 June 14.

 

RESUMEN

Presentamos el descubrimiento de 6 objetos nebulares realizado por astrónomos aficionados. Cuatro de estos objetos son claramente nebulosas planetarias, uno es posiblemente también una nebulosa planetaria, y el último es probablemente una región H II. La nebulosa bipolar Ou4 tiene la extensión angular más grande hasta ahora encontrada: más de un grado en el cielo! Consideramos varios escenarios para explicar este objeto. Ou4 podría ser una de las nebulosas planetarias más cercanas, aunque su naturaleza como tal debe aún ser confirmada.

 

ABSTRACT

We present the discovery of 6 nebular objects made by amateur astronomers. Four of these discoveries are clearly planetary nebulae (PNe), one is a possible PN, and another is a likely H II region. The bipolar nebula Ou4 presents the largest angular extent ever found: over one degree on the sky! We consider various scenarios that could explain such a nebula. Ou4 could be one of the nearest PNe known, though its possible PN nature will need confirmation.

Key Words: planetary nebulae: general — surveys.

 

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ACKNOWLEDGMENTS

AA is grateful to Ch. Motch and M. Pakull from the Strasbourg Observatory for their help in the identification of the X–ray counterpart of Ou4. Many thanks to Josef Pöpsel and S. Binnewies (www.capella–observatory.com) for providing the superb image of lDûl. FA would like to thank the CROW team (Jose Canela, Jorge Canela and Paulo Barros), the Atalaia team (Alberto Fernando, Jose Ribeiro and Joaõ Gregório and Licínio Almeida) for their valuable support, and Phillippe Stee, George Jacoby, Lubos Kohoutek for their useful advice. LS is supported by PAPIIT–Universidad Nacional Autónoma de México grant IN109509 (México). BM gratefully acknowledges the ESO Chile Visitor Programme.

 

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