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Hot Molecular Gas Orbiting Young Stars:  Planet Forming Disks or Small Stellar Companions?. A look at data taken at the 200” Mount Palomar Telescope, and at NASA’s IRTF on Mauna Kea David Whelan, April 6, 2005. Today I will discuss:. The electromagnetic spectrum and where we are looking in it.

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hot molecular gas orbiting young stars planet forming disks or small stellar companions

Hot Molecular Gas Orbiting Young Stars:  Planet Forming Disks or Small Stellar Companions?

A look at data taken at the 200” Mount Palomar Telescope, and at NASA’s IRTF on Mauna Kea

David Whelan, April 6, 2005

slide2

Today I will discuss:

  • The electromagnetic spectrum and where we are looking in it
  • What Herbig AeBe stars are and how we believe they form
  • Where we went to observe Herbig AeBe stars
  • Some results: expected and unexpected
the infrared
The infrared

spectrum

IR: roughly l=1-200 mm

slide4

1)Condensation of dust and gas

  • 2)Formation of a protostar surrounded by an envelope of gas and dust
  • 3)Young star surrounded by spinning accretion disk.

The three theoretical steps for the evolution of intermediate mass stars are:

Herbig AeBe stars

slide8

Some results: possible spectral features and where they come from

Molecular features in emission (CO)

Molecular features in absorption

SUN

DISK

Molecular features in absorption (cool stars)

Atomic features in emission (Br gamma)

slide12

It turns out HD 41511 is a binary star, and may look like this image of Gilese A and B

http://www.bbc.co.uk/science/space/stars/startypes/index.shtml

slide13

THE END

THANK YOU!