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J/ApJ/788/105     XSTPS RR Lyrae in the north Galactic cap     (Faccioli+, 2014)

RR Lyrae in XSTPS: the halo density profile in the north Galactic cap. Faccioli L., Smith M.C., Yuan H.-B., Zhang H.-H., Liu X.-W., Zhao H.-B., Yao J.-S. <Astrophys. J., 788, 105 (2014)> =2014ApJ...788..105F (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, variable ; Stellar distribution ; Photometry, SDSS ; Stars, distances ; Surveys Keywords: Galaxy: halo - Galaxy: stellar content - Galaxy: structure - stars: variables: RR Lyrae - surveys - techniques: photometric Abstract: We present a catalog of RR Lyrae stars (RRLs) observed by the Xuyi Schmidt Telescope Photometric Survey (XSTPS). The area we consider is located in the north Galactic cap, covering ∼376.75 deg2 at RA∼150° and DE∼27° down to a magnitude limit of i∼19. Using the variability information afforded by the multi-epoch nature of our XSTPS data, combined with colors from the Sloan Digital Sky Survey, we are able to identify candidate RRLs. We find 318 candidates, derive distances to them, and estimate the detection efficiency. The majority of our candidates have more than 12 observations, and for these we are able to calculate periods. These also allow us to estimate our contamination level, which we predict is between 30% and 40%. Finally, we use the sample to probe the halo density profile in the 9-49 kpc range and find that it can be well fitted by a double power law. We find good agreement between this model and the models derived for the south Galactic cap using the Watkins et al. (2009, J/MNRAS/398/1757) and Sesar et al. (2010, J/ApJ/708/717) RRL data sets, after accounting for possible contamination in our data set from Sagittarius stream members. We consider non-spherical double power-law models of the halo density profile and again find agreement with literature data sets, although we have limited power to constrain the flattening due to our small survey area. Much tighter constraints will be placed by current and future wide-area surveys, most notably ESA's astrometric Gaia mission. Our analysis demonstrates that surveys with a limited number of epochs can effectively be mined for RRLs. Our complete sample is provided as accompanying online material; as an example the first few entries of each electronic table are shown in the text. Description: XSTPS is a three-band photometric survey of the Milky Way anti-center carried out with the 1.2 m Schmidt telescope at the Xuyi station of the Purple Mountain Observatory in China (Zhang et al. 2013RAA....13..490Z) and completed in 2011 March (see Section 3 of Liu et al. 2014IAUS..298..310L). The survey covers an area of ∼6000 deg2 in a region of the sky that, for the most part, is not covered by other large-scale surveys. It is expected to detect ∼100 million stars in i, and the first data release is due imminently (H.-B. Yuan et al., in preparation); we used a preliminary version of the catalog for our study. The three bands employed in the survey are g, r, i, similar, but not identical, to the corresponding SDSS bands. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 97 318 Basic data for the RRL candidates table5.dat 83 318 SDSS matching information for the 318 RRL in the sample table6.dat 40 114 VSX catalog matches table7.dat 9 318 Efficiencies of the 318 RRLs in the sample table8.dat 51 265 Periods for the 265 RRL candidates in the sample with at least 12 observations table9.dat 48 8528 Light curves for the 318 RRLs in the sample table10.dat 48 318 Heliocentric and galactocentric distances for the 318 RRLs in the sample
See also: B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/AJ/127/1158 : QUEST RR Lyrae Survey first catalog (Vivas+, 2004) J/AJ/132/1202 : RR Lyrae in Northern Sky Variability Survey (Kinemuchi+, 2006) J/ApJ/678/851 : RR Lyrae survey in the Galactic Halo (Keller+, 2008) J/MNRAS/398/1757 : RR Lyraes in SDSS stripe 82 (Watkins+, 2009) J/ApJ/708/717 : Light curve templates of RR Lyrae stars (Sesar+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [1/318] RRL candidate identifier 5- 6 I2 h RAh Hour of Right Ascension (J2000) 8- 9 I2 min RAm Minute of Right Ascension (J2000) 11- 16 F6.3 s RAs Second of Right Ascension (J2000) 18- 19 I2 deg DEd Degree of Declination (J2000) 21- 22 I2 arcmin DEm Arcminute of Declination (J2000) 24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000) 30- 31 I2 --- o_<imag> Number of epochs used in <imag> 33- 37 F5.2 mag <imag> Mean i band magnitude across epochs (1) 39- 42 F4.2 mag e_<imag> Uncertainty in <imag> (2) 44- 47 F4.2 mag sd<imag> ?=-99 Standard deviation in <imag> (3) 49- 51 I3 --- o_<rmag> ?=-99 Number of epochs used in <rmag> (4) 53- 58 F6.2 mag <rmag> ?=-99 Mean r band magnitude across epochs (1) 60- 65 F6.2 mag e_<rmag> ?=-99 Uncertainty in <rmag> (2) 67- 72 F6.2 mag sd<rmag> ?=-99 Standard deviation in <rmag> (3) 74- 76 I3 --- o_<gmag> ?=-99 Number of epochs used in <gmag> (4) 78- 83 F6.2 mag <gmag> ?=-99 Mean g band magnitude across epochs (1) 85- 90 F6.2 mag e_<gmag> ?=-99 Uncertainty in <gmag> (2) 92- 97 F6.2 mag sd<gmag> ?=-99 Standard deviation in <gmag> (3)
Note (1): All magnitudes are corrected for extincion using the Schlegel,Finkbeiner,Davis maps (Schlegel,Finkbeiner,Davis, 1998ApJ...500..525S) Note (2): Quadrature sum of single uncertainties. Note (3): A value of -99 means 1 epoch. Note (4): A value of -99 means no (g|r) data.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [1/318] RRL candidate identifier 5- 6 I2 h RAh Hour of Right Ascension (J2000) 8- 9 I2 min RAm Minute of Right Ascension (J2000) 11- 16 F6.3 s RAs Second of Right Ascension (J2000) 18- 19 I2 deg DEd Degree of Declination (J2000) 21- 22 I2 arcmin DEm Arcminute of Declination (J2000) 24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000) 30- 34 F5.2 mag umag SDSS u band PSF magnitude (1) 36- 39 F4.2 mag e_umag Uncertainty in umag 41- 45 F5.2 mag gmag SDSS g band PSF magnitude (1) 47- 50 F4.2 mag e_gmag Uncertainty in gmag 52- 56 F5.2 mag rmag SDSS r band PSF magnitude (1) 58- 61 F4.2 mag e_rmag Uncertainty in rmag 63- 67 F5.2 mag imag SDSS i band PSF magnitude (1) 69- 72 F4.2 mag e_imag Uncertainty in imag 74- 78 F5.2 mag zmag SDSS z band PSF magnitude (1) 80- 83 F4.2 mag e_zmag Uncertainty in zmag
Note (1): All data in the table come from SDSS "Star" table, Data Release 7 (Cat. II/294)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [2/318] RRL candidate identifier 5- 26 A22 --- VSX VSX catalog identifier (Cat. B/vsx) 28- 31 A4 --- Type VSX catalog type (RRAB, EW, RRC) 33- 40 F8.6 d Period VSX catalog period
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [1/318] RRL candidate identifier 5- 9 F5.3 --- Eff Detection efficiency
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [13/318] RRL candidate identifier (1) 5- 12 F8.6 d Period Period 14- 19 F6.2 --- Lambda Lambda; see text (2) 21- 51 A31 --- Epochs Epoch excluded plus comments (3)
Note (1): The list includes objects classified as "Interlopers" upon visual inspection or "Delta Scuti" if they have a period in the 0.05-0.2d range more significant than the one quoted here (unless reported as RRL by either VSX or CDS), or "Double Period" if the folded light curves shows that the period quoted here is double the true one. Note (2): Objects with Lambda<4 are not considered truly periodic and the quoted period is meaningless, unless reported as RRL by VSX/CDS. Note (3): Epochs are labelled from 0 to N-1 for an object with N observations.
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [1/318] RRL candidate identifier 5 A1 --- Band [gri] Observational band 7- 15 F9.3 d MJD Modfied Julian Date 17- 21 F5.2 mag mag Observed XSTPS magnitude in Band 23- 26 F4.2 mag e_mag Uncertainty in mag 28- 29 I2 h RAh Hour of Right Ascension (J2000) 31- 32 I2 min RAm Minute of Right Ascension (J2000) 34- 37 F4.1 s RAs Second of Right Ascension (J2000) 39- 40 I2 deg DEd Degree of Declination (J2000) 42- 43 I2 arcmin DEm Arcminute of Declination (J2000) 45- 48 F4.1 arcsec DEs Arcsecond of Declination (J2000)
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [1/318] RRL candidate identifier 5- 14 F10.7 kpc HDist Heliocentric Distance 16- 25 F10.8 kpc e_HDist Uncertainty in HDist 27- 36 F10.7 kpc GDist Galactocentric Distance 38- 48 F11.9 kpc e_GDist Uncertainty in GDist
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 11-Jul-2017
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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