EPISODIC HIGH-VELOCITY OUTFLOWS FROM V899 Mon: A CONSTRAINT ON THE OUTFLOW MECHANISMS

Journal Article · Fri Jul 01 00:00:00 EDT 2016 · Astrophysical Journal

DOI:https://doi.org/10.3847/0004-637X/825/1/65· OSTI ID:22666118

Ninan, J. P.; Ojha, D. K. ^[1]; Philip, N. S. ^[2]

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1. Tata Institute of Fundamental Research, Mumbai-400005 (India)
2. St. Thomas College, Kozhencheri, Kerala (India)

We report the detection of large variations in the outflow wind velocity from a young eruptive star, V899 Mon, during its ongoing high accretion outburst phase. Such large variations in the outflow velocity (from −722 to −425 km s{sup −1}) have never been reported previously in this family of objects. Our continuous monitoring of this source shows that the multi-component, clumpy, and episodic high velocity outflows are stable in the timescale of a few days, and vary over the timescale of a few weeks to months. We detect significant decoupling in the instantaneous outflow strength to accretion rate. From the comparison of various possible outflow mechanisms in magnetospheric accretion of young stellar objects, we conclude magnetically driven polar winds to be the most consistent mechanism for the outflows seen in V899 Mon. The large scale fluctuations in outflow over the short period makes V899 Mon the most ideal source to constrain various magnetohydrodynamics simulations of magnetospheric accretion.

• OSTI ID: 22666118
• Journal Information: Astrophysical Journal, Vol. 825, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AUGER ELECTRON SPECTROSCOPY
COMPARATIVE EVALUATIONS
DECOUPLING
DETECTION
FLUCTUATIONS
MAGNETOHYDRODYNAMICS
MOLYBDENUM NITRIDES
PROTOPLANETS
SIMULATION
STARS
STELLAR WINDS