= = we propose to observe three brown dwarf candidates recently discovered in the pleiades - teide 1 (rebolo et al 1995), calar 3 (zapatero-osorio et al 1996) and the likely brown dwarf companion to ppl 15. teide 1 and calar 3 are unique objects in being the first free-floating brown dwarfs discovered. this point deserves stressing - they are not companions to other objects (in fact they are distant from any other objects reducing confusion) and are certainly brown dwarfs. ir observations will provide important inputs to models of brown dwarf atmospheres. as unique objects they deserve intensive study to more fully characterise this poorly known but potentially very important class of objects. ppl 15 is a little more massive than the brown dwarf candidates, but photometry appears to indicate the presence of a very low mass companion (non-resolved) about 1 magnitude fainter. any cooler companion will result in an ir excess, compared to normal m dwarfs. iso data will therefore indicate or refute its presence with observations in the near-ir. any confirmed ir excess would suggest the presence of a very low-mass companion which would be the least massive bd known in the pleiades we intend to image teide 1 and calar 3 directly, and search for an ir-excess in the primary of ppl 15. we will image the pleiades m6 dwarf hhj3 to provide a comparison with ppl 15. ppl 15 and hhj3 have very similar optical spectral types.
Instrument
CAM01
Temporal Coverage
1997-09-15T20:58:01Z/1997-09-16T02:13:30Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 1998, Iso Observations Of The Pleiades Brown Dwarfs Teide 1 And Calar 3, 1.0, European Space Agency, https://doi.org/10.5270/esa-wnppfrn
