PHL 932: When is a planetary nebula not a planetary nebula?

David J. Frew; Greg J. Madsen; Simon J. O'Toole; Quentin A. Parker

doi:10.1071/AS09043

PHL 932: When is a planetary nebula not a planetary nebula?

David J. Frew, Greg J. Madsen, Simon J. O'Toole, Quentin A. Parker

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34 Citations (Scopus)

Abstract

The emission nebula around the subdwarf B (sdB) star PHL 932 is currently classified as a planetary nebula (PN) in the literature. Based on a large body of multi-wavelength data, both new and previously published, we show here that this low-excitation nebula is in fact a small Störmgren sphere (Hii region) in the interstellar medium around this star. We summarise the properties of the nebula and its ionizing star, and discuss its evolutionary status. We find no compelling evidence for close binarity, arguing that PHL 932 is an ordinary sdB star. We also find that the emission nebulae around the hot DO stars PG 0108 + 101 and PG 0109 + 111 are also Störmgren spheres in the ISM, and along with PHL 932, are probably associated with the same extensive region of high-latitude molecular gas in PiscesPegasus.

Original language	English
Pages (from-to)	203-209
Number of pages	7
Journal	Publications of the Astronomical Society of Australia
Volume	27
Issue number	2
DOIs	https://doi.org/10.1071/AS09043
Publication status	Published - 2010

Keywords

Clouds - planetary nebulae
General - Stars
Hii regions - ISM
Horizontal-branch - Stars
Individual (PHL 932) - subdwarfs

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10.1071/AS09043

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@article{f61ad1b2e407410ba1ea2493969b5aa9,

title = "PHL 932: When is a planetary nebula not a planetary nebula?",

abstract = "The emission nebula around the subdwarf B (sdB) star PHL 932 is currently classified as a planetary nebula (PN) in the literature. Based on a large body of multi-wavelength data, both new and previously published, we show here that this low-excitation nebula is in fact a small St{\"o}rmgren sphere (Hii region) in the interstellar medium around this star. We summarise the properties of the nebula and its ionizing star, and discuss its evolutionary status. We find no compelling evidence for close binarity, arguing that PHL 932 is an ordinary sdB star. We also find that the emission nebulae around the hot DO stars PG 0108 + 101 and PG 0109 + 111 are also St{\"o}rmgren spheres in the ISM, and along with PHL 932, are probably associated with the same extensive region of high-latitude molecular gas in PiscesPegasus.",

keywords = "Clouds - planetary nebulae, General - Stars, Hii regions - ISM, Horizontal-branch - Stars, Individual (PHL 932) - subdwarfs",

author = "Frew, {David J.} and Madsen, {Greg J.} and O'Toole, {Simon J.} and Parker, {Quentin A.}",

year = "2010",

doi = "10.1071/AS09043",

language = "English",

volume = "27",

pages = "203--209",

journal = "Publications of the Astronomical Society of Australia",

issn = "1323-3580",

publisher = "CSIRO Publishing",

number = "2",

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TY - JOUR

T1 - PHL 932

T2 - When is a planetary nebula not a planetary nebula?

AU - Frew, David J.

AU - Madsen, Greg J.

AU - O'Toole, Simon J.

AU - Parker, Quentin A.

PY - 2010

Y1 - 2010

N2 - The emission nebula around the subdwarf B (sdB) star PHL 932 is currently classified as a planetary nebula (PN) in the literature. Based on a large body of multi-wavelength data, both new and previously published, we show here that this low-excitation nebula is in fact a small Störmgren sphere (Hii region) in the interstellar medium around this star. We summarise the properties of the nebula and its ionizing star, and discuss its evolutionary status. We find no compelling evidence for close binarity, arguing that PHL 932 is an ordinary sdB star. We also find that the emission nebulae around the hot DO stars PG 0108 + 101 and PG 0109 + 111 are also Störmgren spheres in the ISM, and along with PHL 932, are probably associated with the same extensive region of high-latitude molecular gas in PiscesPegasus.

AB - The emission nebula around the subdwarf B (sdB) star PHL 932 is currently classified as a planetary nebula (PN) in the literature. Based on a large body of multi-wavelength data, both new and previously published, we show here that this low-excitation nebula is in fact a small Störmgren sphere (Hii region) in the interstellar medium around this star. We summarise the properties of the nebula and its ionizing star, and discuss its evolutionary status. We find no compelling evidence for close binarity, arguing that PHL 932 is an ordinary sdB star. We also find that the emission nebulae around the hot DO stars PG 0108 + 101 and PG 0109 + 111 are also Störmgren spheres in the ISM, and along with PHL 932, are probably associated with the same extensive region of high-latitude molecular gas in PiscesPegasus.

KW - Clouds - planetary nebulae

KW - General - Stars

KW - Hii regions - ISM

KW - Horizontal-branch - Stars

KW - Individual (PHL 932) - subdwarfs

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DO - 10.1071/AS09043

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SN - 1323-3580

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JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

IS - 2

ER -

PHL 932: When is a planetary nebula not a planetary nebula?

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Keywords

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