First results from the Goddard High-Resolution Spectrograph

Spectroscopic determination of stellar parameters of Melnick 42, an O3f star in the large magellanic cloud

S. R. Heap, B. Altner, D. Ebbets, Ivan - Hubeny, J. B. Hutchings, R. P. Kudritzki, S. A. Voels, S. Haser, A. Pauldrach, J. Puls, K. Butler

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

GHRS and optical (ESO 3.6 m) observations of the O3f star Melnick 42 in the 30 Doradus complex are reported. A first analysis reveals that with a luminosity of 2.3 × 106 L⊙ and a present mass of 100 M⊙, Melnick 42 is one of the most luminous and massive stars known. An estimate of abundances indicates that iron and oxygen are very likely reduced by a factor of 4 relative to the Sun, whereas carbon is more strongly depleted and nitrogen is approximately solar. The terminal velocity of the stellar wind is 3000 km s-1. The mass-loss rate is 4 × 10-6 M⊙ yr-1, with a large uncertainty. The excellent quality GHRS spectrum taken in a crowded region of the LMC demonstrates the superiority of the HST for quantitative ultraviolet spectroscopy of hot stars in other galaxies.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume377
Issue number1 PART II
StatePublished - 1991
Externally publishedYes

Fingerprint

Magellanic clouds
spectrographs
terminal velocity
stars
hot stars
high resolution
ultraviolet spectroscopy
stellar winds
European Southern Observatory
massive stars
sun
spectroscopy
luminosity
galaxies
iron
nitrogen
oxygen
carbon
estimates
parameter

Keywords

  • Galaxies: Magellanic Clouds
  • Stars: individual (Melnick 42)
  • Stars: massive
  • Stars: Of-type
  • Stars: winds
  • Ultraviolet: spectra

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

First results from the Goddard High-Resolution Spectrograph : Spectroscopic determination of stellar parameters of Melnick 42, an O3f star in the large magellanic cloud. / Heap, S. R.; Altner, B.; Ebbets, D.; Hubeny, Ivan -; Hutchings, J. B.; Kudritzki, R. P.; Voels, S. A.; Haser, S.; Pauldrach, A.; Puls, J.; Butler, K.

In: Astrophysical Journal, Vol. 377, No. 1 PART II, 1991.

Research output: Contribution to journalArticle

Heap, SR, Altner, B, Ebbets, D, Hubeny, I, Hutchings, JB, Kudritzki, RP, Voels, SA, Haser, S, Pauldrach, A, Puls, J & Butler, K 1991, 'First results from the Goddard High-Resolution Spectrograph: Spectroscopic determination of stellar parameters of Melnick 42, an O3f star in the large magellanic cloud', Astrophysical Journal, vol. 377, no. 1 PART II.
Heap, S. R. ; Altner, B. ; Ebbets, D. ; Hubeny, Ivan - ; Hutchings, J. B. ; Kudritzki, R. P. ; Voels, S. A. ; Haser, S. ; Pauldrach, A. ; Puls, J. ; Butler, K. / First results from the Goddard High-Resolution Spectrograph : Spectroscopic determination of stellar parameters of Melnick 42, an O3f star in the large magellanic cloud. In: Astrophysical Journal. 1991 ; Vol. 377, No. 1 PART II.
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abstract = "GHRS and optical (ESO 3.6 m) observations of the O3f star Melnick 42 in the 30 Doradus complex are reported. A first analysis reveals that with a luminosity of 2.3 × 106 L⊙ and a present mass of 100 M⊙, Melnick 42 is one of the most luminous and massive stars known. An estimate of abundances indicates that iron and oxygen are very likely reduced by a factor of 4 relative to the Sun, whereas carbon is more strongly depleted and nitrogen is approximately solar. The terminal velocity of the stellar wind is 3000 km s-1. The mass-loss rate is 4 × 10-6 M⊙ yr-1, with a large uncertainty. The excellent quality GHRS spectrum taken in a crowded region of the LMC demonstrates the superiority of the HST for quantitative ultraviolet spectroscopy of hot stars in other galaxies.",
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AU - Altner, B.

AU - Ebbets, D.

AU - Hubeny, Ivan -

AU - Hutchings, J. B.

AU - Kudritzki, R. P.

AU - Voels, S. A.

AU - Haser, S.

AU - Pauldrach, A.

AU - Puls, J.

AU - Butler, K.

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AB - GHRS and optical (ESO 3.6 m) observations of the O3f star Melnick 42 in the 30 Doradus complex are reported. A first analysis reveals that with a luminosity of 2.3 × 106 L⊙ and a present mass of 100 M⊙, Melnick 42 is one of the most luminous and massive stars known. An estimate of abundances indicates that iron and oxygen are very likely reduced by a factor of 4 relative to the Sun, whereas carbon is more strongly depleted and nitrogen is approximately solar. The terminal velocity of the stellar wind is 3000 km s-1. The mass-loss rate is 4 × 10-6 M⊙ yr-1, with a large uncertainty. The excellent quality GHRS spectrum taken in a crowded region of the LMC demonstrates the superiority of the HST for quantitative ultraviolet spectroscopy of hot stars in other galaxies.

KW - Galaxies: Magellanic Clouds

KW - Stars: individual (Melnick 42)

KW - Stars: massive

KW - Stars: Of-type

KW - Stars: winds

KW - Ultraviolet: spectra

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