J/ApJ/724/799 RR Lyrae variables in M33. II. (Yang+, 2010)
RR Lyrae variables in M33.
II. Oosterhoff properties and radial trends.
Yang S.-C., Sarajedini A., Holtzman J.A., Garnett D.R.
<Astrophys. J., 724, 799-817 (2010)>
=2010ApJ...724..799Y 2010ApJ...724..799Y
ADC_Keywords: Stars, variable ; Photometry, HST ; Galaxies, nearby
Keywords: Local Group - stars: variables: RR Lyrae
Abstract:
We present the results of an extensive survey of RR Lyrae (RRL) stars
in three fields along the major axis of the Triangulum Galaxy (M33).
From images taken with the Advanced Camera for Surveys (ACS) Wide
Field Channel on board the Hubble Space Telescope through two
passbands (F606W and F814W), we have identified and characterized a
total of 119 RRL variables (96 RRab (RR0) and 23 RRc (RR1)) in M33.
Using the properties of 83 RRL stars (65 RRab and 18 RRc) in the
innermost ACS field (hereafter DISK2), we find mean periods of
<Pab≥0.553±0.008(error1)±0.05(error2) and
<Pc≥0.325±0.008(error1)±0.05(error2), where the "error1" value
represents the standard error of the mean and the "error2" value is
based on the error of an individual RRL period calculated from our
synthetic light curve simulations. The VI minimum-light colors of the
RRab stars are used to calculate a mean line-of-sight reddening toward
the DISK2 field of <E(V-I)≥0.175.
Description:
The science images used in this study were taken along the major axis
of M33 with the Advanced Camera for Surveys Wide Field Channel
(ACS/WFC) on board Hubble Space Telescope (HST) as a part of the
GO-10190 program (P.I.: D. Garnett), from 2004 September to 2005
February.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 59 2 Properties of anomalous Cepheid candidates
table3.dat 65 122 Properties of RR Lyrae stars
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJS/193/26 : The M33 synoptic stellar survey. I. (Pellerin+, 2011)
J/MNRAS/411/263 : JHK variable stars in M33 (Javadi+ 2011)
J/ApJ/664/850 : Spitzer observations of stars in M33 (McQuinn+, 2007)
J/AJ/132/1361 : RR Lyrae variables in M33 (Sarajedini+, 2006)
J/MNRAS/371/1405 : Variables in M33 (Hartman+, 2006)
J/MNRAS/370/1429 : V photometry of bright stars of M33 (Shporer+, 2006)
J/AJ/121/870 : BVI photometry of Variables in M33 (Macri+, 2001)
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Identification number
8- 9 I2 h RAh Hour of right ascension (J2000)
11- 12 I2 min RAm Minute of right ascension (J2000)
14- 18 F5.2 s RAs Second of right ascension (J2000)
20 A1 --- DE- Sign of declination (J2000)
21- 22 I2 deg DEd Degree of declination (J2000)
24- 25 I2 arcmin DEm Arcminute of declination (J2000)
27- 31 F5.2 arcsec DEs Arcsecond of declination (J2000)
33- 39 F7.4 mag <Vmag> Mean V-band magnitude
41- 46 F6.4 mag <V-I> Mean V-I color index
48- 53 F6.4 d Per Period
55- 60 F6.4 mag AV V-band extinction
62- 63 A2 --- Type [ab/c /d?] RR Lyrae type (only for table 3)
65 I1 --- Field [2/4]? Disk number (only for table 3) (1)
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Note (1): We used three primary ACS/WFC fields in the southwest direction
of the M33 disk referred to as "DISK2" (r=9.3'), "DISK3" (r=15.9'),
and "DISK4" (r=22.6') for the present survey of RRL stars, where r
represents the galactocentric distance of each target field in arcmin.
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History:
From electronic version of the journal
References:
Sarajedini et al. Paper I. 2006AJ....132.1361S 2006AJ....132.1361S Cat. J/AJ/132/1361
(End) Emmanuelle Perret [CDS] 01-Aug-2012