A new planetary nebula in the outer reaches of the Galaxy

被引：9

作者：

Viironen, K. ^{[1
,2
,3
]}

Mampaso, A. ^{[1
,4
]}

Corradi, R. L. M. ^{[1
,4
]}

Drew, J. E. ^{[5
]}

Frew, D. J. ^{[6
]}

Giammanco, C. ^{[1
,4
]}

Greimel, R. ^{[7
]}

Liimets, T. ^{[8
,9
]}

Lindberg, J. E. ^{[8
,10
]}

Rodriguez, M. ^{[11
]}

Sabin, L. ^{[12
]}

Sale, S. E. ^{[5
,13
,14
,15
]}

Wilson, P. A. ^{[8
,16
]}

Zijlstra, A. ^{[17
]}

机构：

[1] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Tenerife, Spain

[2] Calar Alto, Ctr Astron Hispano Aleman, Almeria 04004, Spain

[3] Ctr Estudios Fis Cosmos Aragon CEFCA, Teruel 44001, Spain

[4] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38206, Spain

[5] Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[6] Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia

[7] Karl Franzens Univ Graz, Inst Phys, A-8010 Graz, Austria

[8] Nordic Opt Telescope, Tenerife 38700, Spain

[9] Tartu Observ, EE-61602 Toravere, Estonia

[10] Univ Copenhagen, Nat Hist Museum Denmark, Ctr Star & Planet Format, DK-1350 Copenhagen, Denmark

[11] Inst Nacl Astrofis Opt & Elect INAOE, Puebla 72000, Mexico

[12] Inst Astron UNAM, Ensenada 22860, Baja California, Mexico

[13] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England

[14] Univ Valparaiso, Fac Ciencias, Dept Fis & Astron, Valparaiso, Chile

[15] Pontificia Univ Catolica Chile, Dept Astron & Astrophys, Santiago, Chile

[16] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway

[17] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 530卷

关键词：

Galaxy:; abundances; MILKY-WAY; CHEMICAL EVOLUTION; STELLAR EVOLUTION; GALACTIC DISK; IPHAS; ABUNDANCES; STARS; DISTANCE; EMISSION; SPECTRA;

D O I：

10.1051/0004-6361/201014897

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. A proper determination of the abundance gradient in the Milky Way requires the observation of objects at large galactiocentric distances. With this aim, we are exploring the planetary nebula population towards the Galactic anticentre. In this article, the discovery and physico-chemical study of a new planetary nebula towards the anticentre direction, IPHASX J052531.19+281945.1 (PNG 178.1-04.0), is presented. Methods. The planetary nebula was discovered from the IPHAS survey. Long-slit follow-up spectroscopy was carried out to confirm its planetary nebula nature and to calculate its physical and chemical characteristics. Results. The newly discovered planetary nebula turned out to be located at a very large galactocentric distance (D-GC = 20.8 +/- 3.8 kpc), larger than any previously known planetary nebula with measured abundances. Its relatively high oxygen abundance (12+log(O/H) = 8.36 +/- 0.03) supports a flattening of the Galactic abundance gradient at large galactocentric distances rather than a linearly decreasing gradient.

引用

页数：7

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