Infrared spectroscopy of the 1999 outburst of U Scorpii

A. Evans; J. Krautter; L. Vanzi; S. Starrfield

doi:10.1051/0004-6361:20011154

Infrared spectroscopy of the 1999 outburst of U Scorpii

A. Evans, J. Krautter, L. Vanzi, S. Starrfield

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20 Scopus citations

Abstract

We present infrared spectroscopy of the recurrent nova U Sco, obtained during the 1999 eruption. The 0.94... 2.4 μm spectrum is dominated by H I, He I and He II emission lines and the pseudophotosphere of the hot white dwarf. The ejected material is overabundant in He and O; we estimate He/H ≃ 4.5 ± 1.7 and O/H ≃ 0.013 by number, for electron temperature 2 × 10⁴ K. There appears to be excess emission longward of ∼ 1.4 μm, which is likely to be due to free-free emission by the material ejected in the 1999 eruption; from this we deduce an ejected mass of 2.7 (±0.9) × 10^-7 M⊙.

Original language	English (US)
Pages (from-to)	132-141
Number of pages	10
Journal	Astronomy and Astrophysics
Volume	378
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361:20011154
State	Published - Oct 2001
Externally published	Yes

Keywords

Infrared: stars
Stars: cataclysmic variables
Stars: individual: U Sco

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:20011154

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title = "Infrared spectroscopy of the 1999 outburst of U Scorpii",

abstract = "We present infrared spectroscopy of the recurrent nova U Sco, obtained during the 1999 eruption. The 0.94... 2.4 μm spectrum is dominated by H I, He I and He II emission lines and the pseudophotosphere of the hot white dwarf. The ejected material is overabundant in He and O; we estimate He/H ≃ 4.5 ± 1.7 and O/H ≃ 0.013 by number, for electron temperature 2 × 104 K. There appears to be excess emission longward of ∼ 1.4 μm, which is likely to be due to free-free emission by the material ejected in the 1999 eruption; from this we deduce an ejected mass of 2.7 (±0.9) × 10-7 M⊙.",

keywords = "Infrared: stars, Stars: cataclysmic variables, Stars: individual: U Sco",

author = "A. Evans and J. Krautter and L. Vanzi and S. Starrfield",

year = "2001",

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doi = "10.1051/0004-6361:20011154",

language = "English (US)",

volume = "378",

pages = "132--141",

journal = "Astronomy and Astrophysics",

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T1 - Infrared spectroscopy of the 1999 outburst of U Scorpii

AU - Evans, A.

AU - Krautter, J.

AU - Vanzi, L.

AU - Starrfield, S.

PY - 2001/10

Y1 - 2001/10

N2 - We present infrared spectroscopy of the recurrent nova U Sco, obtained during the 1999 eruption. The 0.94... 2.4 μm spectrum is dominated by H I, He I and He II emission lines and the pseudophotosphere of the hot white dwarf. The ejected material is overabundant in He and O; we estimate He/H ≃ 4.5 ± 1.7 and O/H ≃ 0.013 by number, for electron temperature 2 × 104 K. There appears to be excess emission longward of ∼ 1.4 μm, which is likely to be due to free-free emission by the material ejected in the 1999 eruption; from this we deduce an ejected mass of 2.7 (±0.9) × 10-7 M⊙.

AB - We present infrared spectroscopy of the recurrent nova U Sco, obtained during the 1999 eruption. The 0.94... 2.4 μm spectrum is dominated by H I, He I and He II emission lines and the pseudophotosphere of the hot white dwarf. The ejected material is overabundant in He and O; we estimate He/H ≃ 4.5 ± 1.7 and O/H ≃ 0.013 by number, for electron temperature 2 × 104 K. There appears to be excess emission longward of ∼ 1.4 μm, which is likely to be due to free-free emission by the material ejected in the 1999 eruption; from this we deduce an ejected mass of 2.7 (±0.9) × 10-7 M⊙.

KW - Infrared: stars

KW - Stars: cataclysmic variables

KW - Stars: individual: U Sco

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DO - 10.1051/0004-6361:20011154

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 1

ER -

Infrared spectroscopy of the 1999 outburst of U Scorpii

Abstract

Keywords

ASJC Scopus subject areas

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