search for hpm stars in uwish2 d. froebrich. thank you very much for your interest!
TRANSCRIPT
Search for HPM stars in UWISH2D. Froebrich
Thank you very much
for your interest!
Today:
Why are HPM Stars interesting?
What is UWISH2?
How to identify HPMs?
HPM – High Proper Motion
> 200mas/yr or 1” in 5yrs
or about 60mph at d=10000AU
or about 200km/s at 100pc
or growing hair seen from 10km
HPM stars are either:
very nearby
or
very fast
Nearby Objects:
Low mass stars
Brown Dwarfs
White Dwarfs
Companions to known objects
Nearby Objects:
Very incomplete
even within
10pc!
Nearby Objects:
Very incomplete
in Galactic Plane
Nearby White Dwarfs:
Incomplete
at d>13pc
There are nearby Objects to be found
in or near the Galactic Plane
UKIRT Widefield Infrared Survey for H2
D. Froebrich
and the UWISH2 survey team
(~40 people)
SPECIFICALLY WEARE SEARCHING FOR…:
• Jets and outflows in (high-mass) star forming regions
• H2 emission in IRDCs
• HII regions
• Highly variable stars
• (Proto-)Planetary Nebulae
• Supernova remnants
• ...anything else unusual
3.8 m United Kingdom Infrared Telescope, Mauna Kea, Hawaii
Wide Field Camera (WFCAM)
• Four Rockwell Hawaii-II 2048 x 2048 pixel HgCdTe arrays
• Each array covers a FoV of 13.7’x13.7’ with a pixel scale of 0.4” • Four positions on-sky are required to cover a 0.75 sq deg “tile”
• Filters: K, H2 1-0 S(1)
• micro-stepping 0.2” pixel scale
4 observations (1,2,3,4) to cover 1 ‘tile’
each observation contains 4 images,
one from each detector (w,x,y,z)
each observation stored in one MEF file (1 for H2, one for K)
(Multi-Extension-FITS file)
Naming convention:
‘Tile’ Name: e.g. H2_l15_50: 352
unique for each tile
Observation name: e.g. w20100812_01368
(w<date>_<imagenumber>)
four per tile
Coverage in K and H2 :
Along the Galactic Plane (+/-1.5°) from l=7° to l=65°
about 180 square degrees!
or 234 tiles = 3744 images á 4k x 4k pixels
(936 MEFs)
Howto search?
1) Email df @ star.kent .ac.uk
2) Wait for response containing:
your login and password
tile name and image name to search
3) Search and return results
4) goto point 2) if you like
Download DS9 viewer
http://hea-www.harvard.edu/RD/ds9/
Start Searching
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