SEGUE v3_2 Target Selection cuts


	All ugriz magnitudes listed below are  dereddened PSF mags
	objc_flag[2] check:  No bright, no edge, no bad interp, no bad deblends

	For selections which involve u band, we require that
	the u flags indicate a u band detection.
	
	The 'regular SDSS bright end cut' is: No spectra of
	objects with g,r or i fiber mag < 14.5 allowed.

	For SEGUE v2_0 we cut on r only at r_fiber < 14.5,
	this resulted in 'whopping fiber warnings for 
	red stars where r-i > 0 --> i < 14.5.
	The spectra were ok however and Scattered light was not
	harmful to adjacent fibers on the CCDs.

	For SEGUE v3_0 we are cutting on i_fiber < 14.2.

	This allows bright blue things to get spectra and still avoids
	putting very red bright stars on the plate to scatter.

	Also, proper motions have been included for objects
	which have matches to the USNO-B catalog and are used
	in the K giant and Cool White dwarf selection categories.


	

	
White dwarf selection (STAR_WHITE_DWARF -2146959360) 

	g < 20.3 , -1 < g-r < -0.2, -1 < u-g < 0.7   
	u-g + 2(g-r) < -0.1

	Weighting: magslope 1.2
	Target count Goal: 25 per plate pair

	
 Cool White dwarf selection (STAR_CATY_VAR -2147352576) 
	(cuts from USNO Munn/Harris recommendation):
		http://www.astro.princeton.edu:81/sdss-stars/msg.1242.html

	14.5 < r < 20.5, and propermotion match and ppm H_g > 17.5 &&
	-2 < g-i < (0.12||(dist22 > 7 and nfit=6)) and 
	g-i < 1.7 and H_g > 16.05+2.9(g-i)

	Weighting: magslope 1.2
	Target count Goal: 10 per plate pair
	(but allow overflow if they are present)

	
 A/BHB selection (STAR_BHB -2147475456) 

	CHANGE For v3_2:  Sort candidates by color,
	so that all, or most, blue BHBs g-r < 0 , get a fiber.

	g < 20.5, 0.6 < u-g < 1.4, -0.5 < g-r < 0.2, scolor < -0.065

	Weighting: magslope 2.0
	Target count Goal: 150 per plate pair  (get ~100 per pair)

	
 F turnoff, sub-dwarf selection (SERENDIPITY_BLUE -2146435072)

	-0.7 < p1(s) < -0.25, 0.4 < u-g < 1.4, 0.2 < g-r < 3.0, g < 20.3
	P1 is a color perpendicular to the locus for F/G/K stars,
	more negative P1 indicates lower-metalicity side of locus.

	Weighting: colorslope+ magnitude weighting P1 min/max slope = 5
	Target count Goal: 200 per plate pair 

	
 G selection (STAR_RED_DWAR -2147221504)

	14.0 < r < 20.2, 0.48 < g-r < 0.55

	Note slightly wider g-r color band to get sufficient targets
	at high |b|.

	Weighting: random
	Target count Goal: 375 per plate pair


	
 K Giant Selection (STAR_CARBON -2147467264)

	r < 20.2, 0.7 < u-g < 4.0 , 0.35 < g-r < 0.8,
	  0.15 < r-i < 0.6, l-color > 0.07,  and
	(proper_motion < 11 arcsec/century and good propermotion match)

	Weighting: magslope 2.0
	Target count Goal: 95 per plate pair

	(expected density 4/sq deg = 28/plate pair)
 
	
 Low Metalicity selection (STAR_SUB_DWARF -2147418112)

	14: < r < 19.5, -0.5 < g-r < 0.75, 0.3 < u-g < 3.0, l-color > 0.12
	also require detection in u band.
	

	Weighting: magslope 1.8 and
	Faint plate targets sorted by magnitude to 'pack' them, so
	that brightest ones targetted before fainter ones.
	Target count Goal: 150 per plate pair

	New for v3_1: We also weight by 'l' to favor the ones closer to
	the blue edge of the u-g color in the stellar locus.

	
 K dwarf selection (STAR_BROWN_DWARF  -2147450880)

	14.5 < r < 19.0, 0.55 < g-r < 0.75

		(From Munn and discussion at Pitt meeting)

	Selection: Random subsample
	Target count Goal: 95 per plate pair

	
 M sub-dwarf selection (SERENDIPITY_RED -2143289344)

	M sub-dwarfs (color based West et al ) 
		g-r > 1.6, 0.95 < r-i < 1.3, 14.5 < r < 19.0

	Target count Goal: <~5 per plate pair 
	Selection: magslope 0.9

	Plus: Lepine Shara AMNH high proper motion stars , goal 25-30 per
	plate pair, proper motion selected.

	
 L,T brown-dwarf selection (SERENDIPITY_FIRST -2145386496)

	z < 19.5, u > 21, g > 22, r > 21, i-z > 1.7
	for Brown dwarf selection we require additional flag 
	checks on i and z band as suggested by X. Fan.

	Target count Goal: <5 per plate pair 

	
 AGB candidate selection (SERENDIPITY_DISTANT -2139095040)
	

	14.0 < r < 19.0, 2.5 < u-g < 3.5, 0.9 < g-r < 1.3, s-color < -0.06
		and detection in u band required.
	
	Selection: magslope 1.4
	Target count Goal: 10 per plate pair