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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
.....