Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO)

Paul A. Crowther; A. W. Fullerton; D. J. Hillier; K. Brownsberger; L. Dessart; A. J. Willis; O. De Marco; M. J. Barlow; J. B. Hutchings; D. L. Massa; D. C. Morton; G. Sonneborn

Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO)

Paul A. Crowther^*, A. W. Fullerton, D. J. Hillier, K. Brownsberger, L. Dessart, A. J. Willis, O. De Marco, M. J. Barlow, J. B. Hutchings, D. L. Massa, D. C. Morton, G. Sonneborn

^*Corresponding author for this work

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

28 Citations (Scopus)

Abstract

We present Far Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, an LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 Å. These data are combined with Hubble Space Telescope Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spectroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T_* ∼ 150,000 K, v_∞ = 4100 km s^-1, log (L/L_⊙) = 5.3, and M = 1 × 10^-5 M_⊙ yr^-1, if we adopt a volume filling factor of 10%. Elemental abundances of C/He ∼ 0.7 ± 0.2 and O/He ∼ 0.15^+0.10 _-0.05 by number qualitatively support previous recombination line studies. We confirm that Sand 2 is more chemically enriched in carbon than LMC WC stars and that it is expected to undergo a supernova explosion within the next 5 × 10⁴ yr.

Original language	English
Pages (from-to)	L51–L55
Number of pages	5
Journal	Astrophysical Journal
Volume	538
Issue number	1
Publication status	Published - 20 Jul 2000
Externally published	Yes

Keywords

Stars: evolution
Stars: individual (Sand 2)
Stars: Wolf-Rayet

Cite this

@article{9c4b49b78b09413e8ed1a800a4e79296,

title = "Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO)",

abstract = "We present Far Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, an LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 {\AA}. These data are combined with Hubble Space Telescope Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spectroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T* ∼ 150,000 K, v∞ = 4100 km s-1, log (L/L⊙) = 5.3, and M = 1 × 10-5 M⊙ yr-1, if we adopt a volume filling factor of 10%. Elemental abundances of C/He ∼ 0.7 ± 0.2 and O/He ∼ 0.15+0.10 -0.05 by number qualitatively support previous recombination line studies. We confirm that Sand 2 is more chemically enriched in carbon than LMC WC stars and that it is expected to undergo a supernova explosion within the next 5 × 104 yr.",

keywords = "Stars: evolution, Stars: individual (Sand 2), Stars: Wolf-Rayet",

author = "Crowther, {Paul A.} and Fullerton, {A. W.} and Hillier, {D. J.} and K. Brownsberger and L. Dessart and Willis, {A. J.} and {De Marco}, O. and Barlow, {M. J.} and Hutchings, {J. B.} and Massa, {D. L.} and Morton, {D. C.} and G. Sonneborn",

year = "2000",

month = jul,

day = "20",

language = "English",

volume = "538",

pages = "L51–L55",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "1",

}

TY - JOUR

T1 - Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO)

AU - Crowther, Paul A.

AU - Fullerton, A. W.

AU - Hillier, D. J.

AU - Brownsberger, K.

AU - Dessart, L.

AU - Willis, A. J.

AU - De Marco, O.

AU - Barlow, M. J.

AU - Hutchings, J. B.

AU - Massa, D. L.

AU - Morton, D. C.

AU - Sonneborn, G.

PY - 2000/7/20

Y1 - 2000/7/20

N2 - We present Far Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, an LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 Å. These data are combined with Hubble Space Telescope Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spectroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T* ∼ 150,000 K, v∞ = 4100 km s-1, log (L/L⊙) = 5.3, and M = 1 × 10-5 M⊙ yr-1, if we adopt a volume filling factor of 10%. Elemental abundances of C/He ∼ 0.7 ± 0.2 and O/He ∼ 0.15+0.10 -0.05 by number qualitatively support previous recombination line studies. We confirm that Sand 2 is more chemically enriched in carbon than LMC WC stars and that it is expected to undergo a supernova explosion within the next 5 × 104 yr.

AB - We present Far Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, an LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 Å. These data are combined with Hubble Space Telescope Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spectroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T* ∼ 150,000 K, v∞ = 4100 km s-1, log (L/L⊙) = 5.3, and M = 1 × 10-5 M⊙ yr-1, if we adopt a volume filling factor of 10%. Elemental abundances of C/He ∼ 0.7 ± 0.2 and O/He ∼ 0.15+0.10 -0.05 by number qualitatively support previous recombination line studies. We confirm that Sand 2 is more chemically enriched in carbon than LMC WC stars and that it is expected to undergo a supernova explosion within the next 5 × 104 yr.

KW - Stars: evolution

KW - Stars: individual (Sand 2)

KW - Stars: Wolf-Rayet

UR - http://www.scopus.com/inward/record.url?scp=0034691346&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034691346

SN - 0004-637X

VL - 538

SP - L51–L55

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Far Ultraviolet Spectroscopic Explorer spectroscopy of the O VI resonance doublet in sand 2 (WO)

Abstract

Keywords

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