The enigmatic X-ray point sources at the central stars of NGC 6543 and NGC 7293

Martín A. Guerrero; You Hua Chu; Robert A. Gruendl; Rosa M. Williams; James B. Kaler

doi:10.1086/320509

The enigmatic X-ray point sources at the central stars of NGC 6543 and NGC 7293

Martín A. Guerrero, You Hua Chu, Robert A. Gruendl, Rosa M. Williams, James B. Kaler

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

Abstract

Recent Chandra ACIS-S observations have detected a point source at the central star of NGC 6543 and confirmed the point-source nature of the hard X-ray emission from NGC 7293. The X-ray spectra of both sources peak between 0.5 and 1.0 keV and show line features indicating a thin plasma at temperatures of a few times 10⁶ K. Their X-ray luminosities are 10³⁰ and 3 × 10²⁹ ergs s^-1, respectively. We have considered four different mechanisms to explain the nature of these sources. The X-ray emission from the central star of NGC 6543 may originate from the coronal activity of an undetected companion star or from shocks in its fast stellar wind, while the hard X-ray emission from NGC 7293 might be ascribed to an undetected dMe companion. Follow-up observations are needed to determine the existence and natures of these stellar companions.

Original language	English (US)
Pages (from-to)	L55-L58
Journal	Astrophysical Journal
Volume	553
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/320509
State	Published - May 20 2001

Keywords

Planetary nebulae: general
Planetary nebulae: individual (NGC 6543, NGC 7293)
Stars: AGB and post-AGB
X-rays: stars

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/320509

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title = "The enigmatic X-ray point sources at the central stars of NGC 6543 and NGC 7293",

abstract = "Recent Chandra ACIS-S observations have detected a point source at the central star of NGC 6543 and confirmed the point-source nature of the hard X-ray emission from NGC 7293. The X-ray spectra of both sources peak between 0.5 and 1.0 keV and show line features indicating a thin plasma at temperatures of a few times 106 K. Their X-ray luminosities are 1030 and 3 × 1029 ergs s-1, respectively. We have considered four different mechanisms to explain the nature of these sources. The X-ray emission from the central star of NGC 6543 may originate from the coronal activity of an undetected companion star or from shocks in its fast stellar wind, while the hard X-ray emission from NGC 7293 might be ascribed to an undetected dMe companion. Follow-up observations are needed to determine the existence and natures of these stellar companions.",

keywords = "Planetary nebulae: general, Planetary nebulae: individual (NGC 6543, NGC 7293), Stars: AGB and post-AGB, X-rays: stars",

author = "Guerrero, {Mart{\'i}n A.} and Chu, {You Hua} and Gruendl, {Robert A.} and Williams, {Rosa M.} and Kaler, {James B.}",

note = "Funding Information: This work is supported by the Chandra X-Ray Observatory Center grant GO0-1004X. M. A. G. is supported partially by the Direcci{\'o}n General de Ense{\~n}anza Superior e Investigaci{\'o}n Cient{\'i}fica of the Spanish Ministerio de Educaci{\'o}n y Cultura.",

year = "2001",

month = may,

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doi = "10.1086/320509",

language = "English (US)",

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T1 - The enigmatic X-ray point sources at the central stars of NGC 6543 and NGC 7293

AU - Guerrero, Martín A.

AU - Chu, You Hua

AU - Gruendl, Robert A.

AU - Williams, Rosa M.

AU - Kaler, James B.

N1 - Funding Information: This work is supported by the Chandra X-Ray Observatory Center grant GO0-1004X. M. A. G. is supported partially by the Dirección General de Enseñanza Superior e Investigación Científica of the Spanish Ministerio de Educación y Cultura.

PY - 2001/5/20

Y1 - 2001/5/20

N2 - Recent Chandra ACIS-S observations have detected a point source at the central star of NGC 6543 and confirmed the point-source nature of the hard X-ray emission from NGC 7293. The X-ray spectra of both sources peak between 0.5 and 1.0 keV and show line features indicating a thin plasma at temperatures of a few times 106 K. Their X-ray luminosities are 1030 and 3 × 1029 ergs s-1, respectively. We have considered four different mechanisms to explain the nature of these sources. The X-ray emission from the central star of NGC 6543 may originate from the coronal activity of an undetected companion star or from shocks in its fast stellar wind, while the hard X-ray emission from NGC 7293 might be ascribed to an undetected dMe companion. Follow-up observations are needed to determine the existence and natures of these stellar companions.

AB - Recent Chandra ACIS-S observations have detected a point source at the central star of NGC 6543 and confirmed the point-source nature of the hard X-ray emission from NGC 7293. The X-ray spectra of both sources peak between 0.5 and 1.0 keV and show line features indicating a thin plasma at temperatures of a few times 106 K. Their X-ray luminosities are 1030 and 3 × 1029 ergs s-1, respectively. We have considered four different mechanisms to explain the nature of these sources. The X-ray emission from the central star of NGC 6543 may originate from the coronal activity of an undetected companion star or from shocks in its fast stellar wind, while the hard X-ray emission from NGC 7293 might be ascribed to an undetected dMe companion. Follow-up observations are needed to determine the existence and natures of these stellar companions.

KW - Planetary nebulae: general

KW - Planetary nebulae: individual (NGC 6543, NGC 7293)

KW - Stars: AGB and post-AGB

KW - X-rays: stars

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The enigmatic X-ray point sources at the central stars of NGC 6543 and NGC 7293

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