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Main-Seqence Fitting Distance to the sigma Ori Cluster
W. H. Sherry, F. M. Walter, S. J. Wolk +1
The sigma Ori cluster is an unbound aggregate of a few hundred young, low-mass stars centered on the multiple system sigma Ori. This cluster is of great interest because it is at a…
Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. II. Mixed Trends in VB10 and LSR1835+32 and the Possible Role of Rotation
E. Berger, G. Basri, J. E. Gizis +8
[Abridged] As part of our on-going investigation of magnetic activity in ultracool dwarfs we present simultaneous radio, X-ray, UV, and optical observations of LSR1835+32 (M8.5), a…
Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. I. The Complex Behavior of the M8.5 Dwarf TVLM513-46546
E. Berger, J. E. Gizis, M. S. Giampapa +8
[Abridged] We present the first simultaneous radio, X-ray, ultraviolet, and optical spectroscopic observations of the M8.5 dwarf TVLM513-46546, with a duration of 9 hours. These ob…
The Low-mass Populations in OB Associations
Cesar Briceno, Thomas Preibisch, William Sherry +4
Low-mass stars 0.1 ~< M ~< 1 Msun) in OB associations are key to addressing some of the most fundamental problems in star formation. The low-mass stellar populations of OB associat…
Photometric Identification of the low-Mass Population of Orion OB1b I: The sigma Ori Cluster
W. H. Sherry, F. M. Walter, S. J. Wolk
We report an optical photometric survey of 0.89 sq. degrees of the Orion OB1b association centered on sigma Ori. This region includes most of the sigma Ori cluster, the highest den…
V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months
Frederick M. Walter, Guy S. Stringfellow, William H. Sherry +1
We report on photometric (BVRIJHK) and low dispersion spectroscopic observations of V1647 Ori, the star that drives McNeil's Nebula, between 10 February and 7 May 2004. The star is…