J/ApJS/215/24 Census of blue stars in SDSS DR8 (Scibelli+, 2014)
Census of blue stars in SDSS DR8.
Scibelli S., Newberg H.J., Carlin J.L., Yanny B.
<Astrophys. J. Suppl. Ser., 215, 24 (2014)>
=2014ApJS..215...24S 2014ApJS..215...24S
ADC_Keywords: Photometry, SDSS ; Proper motions ; Spectral types ;
Stars, white dwarf ; Binaries, cataclysmic
Keywords: blue stragglers; Galaxy: stellar content;
novae, cataclysmic variables; stars: AGB and post-AGB;
stars: horizontal-branch; stars: statistics; subdwarfs; white dwarfs
Abstract:
We present a census of the 12060 spectra of blue objects
((g-r)0←0.25) in the Sloan Digital Sky Survey (SDSS) Data Release 8
(DR8). As part of the data release, all of the spectra were
cross-correlated with 48 template spectra of stars, galaxies, and QSOs
to determine the best match. We compared the blue spectra by eye to
the templates assigned in SDSS DR8. 10856 of the objects matched their
assigned template, 170 could not be classified due to low
signal-to-noise ratio, and 1034 were given new classifications. We
identify 7458 DA white dwarfs, 1145 DB white dwarfs, 273 rarer white
dwarfs (including carbon, DZ, DQ, and magnetic), 294 subdwarf O stars,
648 subdwarf B stars, 679 blue horizontal branch stars, 1026 blue
stragglers, 13 cataclysmic variables, 129 white dwarf-M dwarf
binaries, 36 objects with spectra similar to DO white dwarfs, 179,
quasi-stellar objects (QSOs), and 10 galaxies. We provide two tables
of these objects, sample spectra that match the templates, figures
showing all of the spectra that were grouped by eye, and diagnostic
plots that show the positions, colors, apparent magnitudes, proper
motions, etc., for each classification.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 133 10856 Blue stars that match templates
table5.dat 139 1204 Reclassified blue stars
fits/* . 4 Individual FITS files (template spectra of
figures 1 and 2)
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
J/A+A/561/A142 : Galactic extinction from SDSS BHB stars (Tian+, 2014)
J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)
J/ApJ/765/12 : Carbon stars & DQ WDs from SDSS-DR7+DR8 (Green, 2013)
J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)
J/AJ/141/89 : SEGUE stellar parameter pipeline. IV. (Smolinski+, 2011)
J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/A+A/496/191 : Spectral analysis of 636 SDSS WD-M binaries (Heller+, 2009)
J/A+A/483/183 : Catalogue of Blue Stragglers (Moretti+, 2008)
J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008)
J/ApJ/663/1291 : DZ stars in SDSS DR4 (Dufour+, 2007)
J/AJ/134/185 : Cataclysmic variables from SDSS-DR5 (Szkody+, 2007)
J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)
J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)
J/AJ/127/899 : Blue HB stars in SDSS (Sirko+, 2004)
J/AJ/126/1023 : White Dwarfs in the SDSS (Harris+, 2003)
J/PASP/110/1342 : Unusual objects in the SDSS (Krisciunas+ 1998)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 F13.9 deg RAdeg Right Ascension in decimal degrees (J2000)
15- 28 F14.10 deg DEdeg Declination in decimal degrees (J2000)
30- 33 I4 --- Plate SDSS plate number
35- 39 I5 d MJD Modified Julian Date of SDSS observation
41- 43 I3 --- Fiber SDSS fiber number
45- 50 A6 --- Class SDSS Classification (GALAXY, STAR, QSO)
52- 61 A10 --- SClass SDSS Subclassification (1)
63- 67 F5.1 --- S/N [0.9/102] Signal-to-Noise
69- 73 F5.2 mag gmag0 [13.3/21.6] Reddening corrected SDSS g band
magnitude
75- 79 F5.2 mag u-g Reddening corrected SDSS (u-g) color index
81- 85 F5.2 mag g-r Reddening corrected SDSS (g-r) color index
87- 92 F6.1 mas/yr pmGLAT SDSS proper motion along galactic latitude
94- 99 F6.1 mas/yr pmGLON SDSS proper motion along galactic
longitude (µlcos(b))
101-110 A10 --- K13 WD classification from Kleinman et al. 2013,
J/ApJS/204/5
112-123 A12 --- E06 Eisenstein et al. 2006, J/ApJS/167/40,
classification
125-133 A9 --- S11 Szkody et al. 2011, J/AJ/142/181,
classification
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Note (1): Subclasses counts are:
O = 220
OB = 848
B6 = 209
B9 = 365
A0 = 1026
A0p = 679
CV = 7
WD = 7246
CarbonWD = 9
WDmagnetic = 58
BROADLINE = 172
STARBUSRT = 11
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 23 F12.8 deg DEdeg Declination in decimal degrees (J2000)
25- 28 I4 --- Plate SDSS plate number
30- 34 I5 d MJD Modified Julian Date of SDSS observation
36- 38 I3 --- Fiber SDSS fiber number
40- 47 A8 --- Temp Template used (spectral type, Galaxy, QSO, CV)
49- 53 F5.1 --- S/N [0.5/105] Signal-to-Noise
55- 59 F5.2 mag gmag0 [13.6/21.7] Reddening corrected SDSS g band
magnitude
61- 65 F5.2 mag u-g Reddening corrected SDSS (u-g) color index
67- 71 F5.2 mag g-r Reddening corrected SDSS (g-r) color index
73- 78 F6.1 mas/yr pmGLAT SDSS proper motion along galactic latitude
80- 85 F6.1 mas/yr pmGLON SDSS proper motion along galactic
longitude (µlcos(b))
87- 92 F6.3 mag Var [0/10.3] Variability (1)
94- 96 I3 --- o_Var [1/117] Number of SDSS DR8 observations used
in Var
98-106 A9 --- New New classification
108-117 A10 --- K13 WD classification from Kleinman et al. 2013,
J/ApJS/204/5,
119-130 A12 --- E06 Eisenstein et al. 2006, J/ApJS/167/40,
classification
132-139 A8 --- S11 Szkody et al. 2011, J/AJ/142/181,
classification
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Note (1): The difference between the faintest and brightest r0 magnitude of
all of the photometric measurements in SDSS DR8.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Feb-2015