{sigma} ORIONIS IRS1 A AND B: A BINARY CONTAINING A PROPLYD

Journal Article · Thu Aug 20 04:00:00 EDT 2009 · Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/701/2/L100; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21325847

Hodapp, Klaus W ^[1]; Iserlohe, Christof; Krabbe, Alfred ^[2]; Stecklum, Bringfried ^[3]

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1. Institute for Astronomy, University of Hawaii, 640 N. Aohoku Place, Hilo, HI 96720 (United States)
2. Deutsches SOFIA Institut, Universitaet Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart (Germany)
3. Thueringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg (Germany)

We report optical and infrared imaging spectroscopy observations of the young binary object {sigma} Orionis IRS1 A/B. The brighter component ({sigma} Ori IRS1 A) of this binary system has M1 spectral type and a mass in the range of {approx} 0.3-0.8 M {sub sun}. The fainter component ({sigma} Ori IRS1 B) has a unique morphology and spectrum. The unresolved stellar object is surrounded by an extended envelope that is slightly offset from the position of this star. The envelope's spectrum shows strong emission lines of H and He I but no shock-excited emission from H{sub 2} or [Fe II]. The embedded stellar object {sigma} Ori IRS1 B has an absorption spectrum characteristic of a late M photosphere, but with an additional approximately equal amount of dust continuum flux veiling the absorption lines. {sigma} Ori IRS1 B is probably a young brown dwarf embedded in a proplyd that is being photoevaporated by the UV flux of the nearby multiple O and B star system {sigma} Ori.

• OSTI ID: 21325847
• Journal Information: Astrophysical Journal (Online), Journal Name: Astrophysical Journal (Online) Journal Issue: 2 Vol. 701; ISSN 1538-4357
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABSORPTION
ABSORPTION SPECTRA
DUSTS
DWARF STARS
EMISSION
HELIUM
HYDROGEN
MASS
MORPHOLOGY
PHOTOSPHERE
SPECTROSCOPY