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J/AJ/138/606        Hot subdwarf stars in rejected PG catalog      (Wade+, 2009)

Hot subdwarf stars among the objects rejected from the PG catalog: a first assessment using GALEX photometry. Wade R.A., Stark M.A., Green R.F., Durrell P.R. <Astron. J., 138, 606-614 (2009)> =2009AJ....138..606W
ADC_Keywords: Stars, subdwarf ; Photometry, ultraviolet Keywords: binaries: close - stars: horizontal-branch - subdwarfs - ultraviolet: stars Abstract: The hot subdwarf (sd) stars in the Palomar Green (PG) catalog of ultraviolet excess (UVX) objects play a key role in investigations of the frequency and types of binary companions and the distribution of orbital periods. These are important for establishing whether and by which channels the sd stars arise from interactions in close binary systems. It has been suggested that the list of PG sd stars is biased by the exclusion of many stars in binaries, whose spectra show the CaII K line in absorption. A total of 1125 objects that were photometrically selected as candidates were ultimately rejected from the final PG catalog using this K-line criterion. We study 88 of these "PG-Rejects" (PGRs), to assess whether there are significant numbers of unrecognized sd stars in binaries among the PGR objects. Description: GALEX Release 2/3 was most recently interrogated in 2008 May, using the cross-correlation search page of the Multimission Archive at Space Telescope (MAST). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 43 88 PGR sources and 2MASS counterparts table2.dat 75 88 GALEX and V-band photometry of PGR objects
See also: II/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [PGR] 5- 15 A11 --- PGR Palomar Green Rejects name (JHHMMm+DDMM) 17- 21 A5 --- --- [2MASS] 23- 39 A17 --- 2MASS 2MASS designation (JHHMMSSss+DDMMSSs) 41- 43 A3 --- n_PGR Additional note(s) for PGR (1)
Note (1): Notes as follows: 1 = Positional offset between USNO-A2 and 2MASS exceeds 1.5" (80th percentile of offset size) 2 = There is a second 2MASS object within 10" of the USNO position
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [PGR] 5- 15 A11 --- PGR Palomar Green Rejects name (JHHMMm+DDMM) 17- 21 F5.2 mag Fmag Galex FUV band AB magnitude 23- 26 F4.2 mag e_Fmag ? The 1σ error in Fmag (1) 28- 32 F5.2 mag Nmag Galex NUV band AB magnitude 34- 37 F4.2 mag e_Nmag The 1σ error in Nmag 39- 42 F4.1 mag Vmag V band magnitude 44 A1 --- r_Vmag [A-D] Reference for Vmag (2) 46 A1 --- l_F-N Limit flag on F-N 48- 52 F5.2 mag F-N Galex FUV-NUV color index (1) 54- 57 F4.2 mag N-V The NUV-V color index 59- 63 F5.3 mag E(B-V) The B-V color excess (3) 65- 69 F5.2 mag (N-V)0 Dereddened NUV-V color index (4) 71- 75 A5 --- Notes Additional note(s) (5)
Note (1): If no error is reported, then Fmag is an upper limit and thus the (F-N) color is also a limit. Note (2): References as follows: A = Estimated with USNO-A2 data as: V=RUSNO+0.32(BUSNO-RUSNO)+0.23 B = Estimatid with SDSS data as V=g-0.58(g-r)-0.01 C = photoelectric UBV photometry carried out by R.F.G. during the original PG survey D = photoelectric CCD photometry in V and I by the All Sky Automated Survey (ASAS; Pojmanski 2002, Cat. II/264) Note (3): From Schlegel et al. (1998ApJ...500..525S), as returned by the MAST query. Note (4): Using E(N-V)=4.8xE(B-V). Note (5): Notes as follows: LOCK = Lockman hole observation GI = Guest Investigator observation MIS = Medium Imaging Survey observation NGA = Nearby Galaxy Atlas observation comp? = above and to the right of the loci shown for single stars at Teff∼7000K hot = near the hot end of the stellar locus
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jan-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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