Search for HPM stars in UWISH2 D. Froebrich. Thank you very much for your interest!

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Presentation transcript:

Search for HPM stars in UWISH2 D. 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 H 2 D. Froebrich and the UWISH2 survey team (~40 people)

SPECIFICALLY WE ARE SEARCHING FOR…: Jets and outflows in (high-mass) star forming regions H 2 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, H 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. w _01368 (w _ ) 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) 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

UWISH2 Website

UWISH2 Website

UWISH2 Website

UWISH2 Website

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