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J/ApJ/834/160  ugriz colors of RR Lyrae stars in SDSS Stripe 82  (Ngeow+, 2017)

Period-color and amplitude-color relations at maximum and minimum light for RR Lyrae stars in the SDSS Stripe 82 Region. Ngeow C.-C., Kanbur S.M., Bhardwaj A., Schrecengost Z., Singh H.P. <Astrophys. J., 834, 160-160 (2017)> =2017ApJ...834..160N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, SDSS ; Colors Keywords: stars: atmospheres; stars: fundamental parameters; stars: variables: RR Lyrae Abstract: Investigation of period-color (PC) and amplitude-color (AC) relations at the maximum and minimum light can be used to probe the interaction of the hydrogen ionization front (HIF) with the photosphere and the radiation hydrodynamics of the outer envelopes of Cepheids and RR Lyraes. For example, theoretical calculations indicated that such interactions would occur at minimum light for RR Lyrae and result in a flatter PC relation. In the past, the PC and AC relations have been investigated by using either the (V-R)MACHO or (V-I) colors. In this work, we extend previous work to other bands by analyzing the RR Lyraes in the Sloan Digital Sky Survey Stripe 82 Region. Multi-epoch data are available for RR Lyraes located within the footprint of the Stripe 82 Region in five (ugriz) bands. We present the PC and AC relations at maximum and minimum light in four colors: (u-g)0, (g-r)0, (r-i)0, and (i-z)0, after they are corrected for extinction. We found that the PC and AC relations for this sample of RR Lyraes show a complex nature in the form of flat, linear or quadratic relations. Furthermore, the PC relations at minimum light for fundamental mode RR Lyrae stars are separated according to the Oosterhoff type, especially in the (g-r)0 and (r-i)0 colors. If only considering the results from linear regressions, our results are quantitatively consistent with the theory of HIF-photosphere interaction for both fundamental and first overtone RR Lyraes. Description: The ugriz band photometric light-curve data for RR Lyraes in the SDSS Stripe 82 region was adopted from Sesar+ (2010, J/ApJ/708/717), who found 483 RR Lyrae based on observations that spanned from 1998 September to 2007 November. Median numbers of data points per light curve are 55 and 56 in uz bands and gri bands, respectively. This set of RR Lyraes includes 379 fundamental mode RRab stars and 104 first overtone RRc stars. In addition to the light-curve data, Sesar+ (2010, J/ApJ/708/717) also provided the ugriz band template light curves for RR Lyraes. We adopted these template light curves to derive the amplitudes and colors at maximum and minimum light for each RR Lyrae in the sample. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 398 Amplitudes and colors at the maximum and minimum light for RR Lyrae stars in the sample
See also: J/AJ/130/1640 : Photom. of candidate RR Lyrae stars in the SDSS (Wu+, 2005) J/AcA/59/1 : VI light curves of LMC RR Lyrae stars (Soszynski+, 2009) 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) J/MNRAS/424/2528 : RR Lyrae in SDSS Stripe 82 (Suveges+, 2012) J/MNRAS/441/715 : Mid-infrared study of RR Lyrae stars (Gavrilchenko+, 2014) J/MNRAS/441/1230 : RRLyr stars in the Catalins Sky Survey (CS2) (Abbas+, 2014) http://www.astro.washington.edu/users/ivezic/sdss/catalogs/stripe82.html : SDSS Stripe 82 Standard Star Catalog webpage Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 I8 --- [SIG2010] RR Lyrae ID (Sesar+, 2010, J/ApJ/708/717) 10- 16 A7 --- Type RR Lyrae type (1) 18- 25 F8.5 [d] log(P) [-0.6/-0.08] log of Period 27- 31 F5.3 mag gAmp [0.2/1.7] g-band amplitude 33- 37 F5.3 mag (u-g)_MAX [0.9/1.3] Extinction corrected (u-g) color index at maximum light 39- 44 F6.3 mag (g-r)_MAX [-0.3/0.2] Extinction corrected (g-r) color index at maximum light 46- 51 F6.3 mag (r-i)_MAX [-0.3/0.07] Extinction corrected (r-i) color index at maximum light 53- 58 F6.3 mag (i-z)_MAX [-0.2/0.09] Extinction corrected (i-z) color index at maximum light 60- 64 F5.3 mag (u-g)_MIN [0.8/1.3] Extinction corrected (u-g) color index at minimum light 66- 71 F6.3 mag (g-r)_MIN [-0.02/0.4] Extinction corrected (g-r) color index at minimum light 73- 78 F6.3 mag (r-i)_MIN [-0.06/0.2] Extinction corrected (r-i) color index at minimum light 80- 85 F6.3 mag (i-z)_MIN [-0.08/0.2] Extinction corrected (i-z) color index at minimum light
Note (1): RR Lyrae type as follows: ab-OoI = Bailey type ab + Oosterhoff type I; ab-OoII = Bailey type ab + Oosterhoff type II; c = Bailey type c.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-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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