Abell 48 - A rare WN-type central star of a planetary nebula

H. Todt; A. Y. Kniazev; V. V. Gvaramadze; W. R. Hamann; D. Buckley; L. Crause; S. M. Crawford; A. A.S. Gulbis; C. Hettlage; E. Hooper; T. O. Husser; P. Kotze; N. Loaring; K. H. Nordsieck; D. O'Donoghue; T. Pickering; S. Potter; E. Romero-Colmenero; P. Vaisanen; T. Williams; M. Wolf

doi:10.1093/mnras/stt056

Abell 48 - A rare WN-type central star of a planetary nebula

H. Todt, A. Y. Kniazev, V. V. Gvaramadze, W. R. Hamann, D. Buckley, L. Crause, S. M. Crawford, A. A.S. Gulbis, C. Hettlage, E. Hooper, T. O. Husser, P. Kotze, N. Loaring, K. H. Nordsieck, D. O'Donoghue, T. Pickering, S. Potter, E. Romero-Colmenero, P. Vaisanen, T. WilliamsM. Wolf

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogendeficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines. Most of them exhibit emission-line spectra resembling those of massive WC stars. Therefore these stars are classed as CSPNe of spectral type [WC]. Recently, quantitative spectral analysis of two emission-line CSs, PB 8 and IC 4663, revealed that these stars do not belong to the [WC] class. Instead PB 8 has been classified as [WN/WC] type and IC 4663 as [WN] type. In this work we report the spectroscopic identification of another rare [WN] star, the CS of Abell 48. We performed a spectral analysis of Abell 48 with the Potsdam Wolf- Rayet (PoWR) models for expanding atmospheres. We find that the expanding atmosphere of Abell 48 is mainly composed of helium (85 per cent by mass), hydrogen (10 per cent) and nitrogen (5 per cent). The residual hydrogen and the enhanced nitrogen abundance make this object different from the other [WN] star IC 4663. We discuss the possible origin of this atmospheric composition.

Original language	English (US)
Pages (from-to)	2302-2312
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	430
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stt056
State	Published - Apr 11 2013
Externally published	Yes

Keywords

Planetary nebulae: general
Stars: AGB and post-AGB
Stars: Wolf- Rayet
Stars: abundances
Stars: mass-loss

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stt056

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Todt, H., Kniazev, A. Y., Gvaramadze, V. V., Hamann, W. R., Buckley, D., Crause, L., Crawford, S. M., Gulbis, A. A. S., Hettlage, C., Hooper, E., Husser, T. O., Kotze, P., Loaring, N., Nordsieck, K. H., O'Donoghue, D., Pickering, T., Potter, S., Romero-Colmenero, E., Vaisanen, P., ... Wolf, M. (2013). Abell 48 - A rare WN-type central star of a planetary nebula. Monthly Notices of the Royal Astronomical Society, 430(3), 2302-2312. https://doi.org/10.1093/mnras/stt056

Todt, H, Kniazev, AY, Gvaramadze, VV, Hamann, WR, Buckley, D, Crause, L, Crawford, SM, Gulbis, AAS, Hettlage, C, Hooper, E, Husser, TO, Kotze, P, Loaring, N, Nordsieck, KH, O'Donoghue, D, Pickering, T, Potter, S, Romero-Colmenero, E, Vaisanen, P, Williams, T & Wolf, M 2013, 'Abell 48 - A rare WN-type central star of a planetary nebula', Monthly Notices of the Royal Astronomical Society, vol. 430, no. 3, pp. 2302-2312. https://doi.org/10.1093/mnras/stt056

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title = "Abell 48 - A rare WN-type central star of a planetary nebula",

abstract = "A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogendeficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines. Most of them exhibit emission-line spectra resembling those of massive WC stars. Therefore these stars are classed as CSPNe of spectral type [WC]. Recently, quantitative spectral analysis of two emission-line CSs, PB 8 and IC 4663, revealed that these stars do not belong to the [WC] class. Instead PB 8 has been classified as [WN/WC] type and IC 4663 as [WN] type. In this work we report the spectroscopic identification of another rare [WN] star, the CS of Abell 48. We performed a spectral analysis of Abell 48 with the Potsdam Wolf- Rayet (PoWR) models for expanding atmospheres. We find that the expanding atmosphere of Abell 48 is mainly composed of helium (85 per cent by mass), hydrogen (10 per cent) and nitrogen (5 per cent). The residual hydrogen and the enhanced nitrogen abundance make this object different from the other [WN] star IC 4663. We discuss the possible origin of this atmospheric composition.",

keywords = "Planetary nebulae: general, Stars: AGB and post-AGB, Stars: Wolf- Rayet, Stars: abundances, Stars: mass-loss",

author = "H. Todt and Kniazev, {A. Y.} and Gvaramadze, {V. V.} and Hamann, {W. R.} and D. Buckley and L. Crause and Crawford, {S. M.} and Gulbis, {A. A.S.} and C. Hettlage and E. Hooper and Husser, {T. O.} and P. Kotze and N. Loaring and Nordsieck, {K. H.} and D. O'Donoghue and T. Pickering and S. Potter and E. Romero-Colmenero and P. Vaisanen and T. Williams and M. Wolf",

year = "2013",

month = apr,

day = "11",

doi = "10.1093/mnras/stt056",

language = "English (US)",

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pages = "2302--2312",

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T1 - Abell 48 - A rare WN-type central star of a planetary nebula

AU - Todt, H.

AU - Kniazev, A. Y.

AU - Gvaramadze, V. V.

AU - Hamann, W. R.

AU - Buckley, D.

AU - Crause, L.

AU - Crawford, S. M.

AU - Gulbis, A. A.S.

AU - Hettlage, C.

AU - Hooper, E.

AU - Husser, T. O.

AU - Kotze, P.

AU - Loaring, N.

AU - Nordsieck, K. H.

AU - O'Donoghue, D.

AU - Pickering, T.

AU - Potter, S.

AU - Romero-Colmenero, E.

AU - Vaisanen, P.

AU - Williams, T.

AU - Wolf, M.

PY - 2013/4/11

Y1 - 2013/4/11

N2 - A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogendeficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines. Most of them exhibit emission-line spectra resembling those of massive WC stars. Therefore these stars are classed as CSPNe of spectral type [WC]. Recently, quantitative spectral analysis of two emission-line CSs, PB 8 and IC 4663, revealed that these stars do not belong to the [WC] class. Instead PB 8 has been classified as [WN/WC] type and IC 4663 as [WN] type. In this work we report the spectroscopic identification of another rare [WN] star, the CS of Abell 48. We performed a spectral analysis of Abell 48 with the Potsdam Wolf- Rayet (PoWR) models for expanding atmospheres. We find that the expanding atmosphere of Abell 48 is mainly composed of helium (85 per cent by mass), hydrogen (10 per cent) and nitrogen (5 per cent). The residual hydrogen and the enhanced nitrogen abundance make this object different from the other [WN] star IC 4663. We discuss the possible origin of this atmospheric composition.

AB - A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogendeficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines. Most of them exhibit emission-line spectra resembling those of massive WC stars. Therefore these stars are classed as CSPNe of spectral type [WC]. Recently, quantitative spectral analysis of two emission-line CSs, PB 8 and IC 4663, revealed that these stars do not belong to the [WC] class. Instead PB 8 has been classified as [WN/WC] type and IC 4663 as [WN] type. In this work we report the spectroscopic identification of another rare [WN] star, the CS of Abell 48. We performed a spectral analysis of Abell 48 with the Potsdam Wolf- Rayet (PoWR) models for expanding atmospheres. We find that the expanding atmosphere of Abell 48 is mainly composed of helium (85 per cent by mass), hydrogen (10 per cent) and nitrogen (5 per cent). The residual hydrogen and the enhanced nitrogen abundance make this object different from the other [WN] star IC 4663. We discuss the possible origin of this atmospheric composition.

KW - Planetary nebulae: general

KW - Stars: AGB and post-AGB

KW - Stars: Wolf- Rayet

KW - Stars: abundances

KW - Stars: mass-loss

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

Abell 48 - A rare WN-type central star of a planetary nebula

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