J/AJ/127/861 RR Lyrae in Draco dSph (Bonanos+, 2004)
The RR Lyrae distance to the Draco dwarf spheroidal galaxy.
Bonanos A.Z., Stanek K.Z., Szentgyorgyi A.H., Sasselov D.D., Bakos G.A.
<Astron. J., 127, 861-867 (2004)>
=2004AJ....127..861B 2004AJ....127..861B
ADC_Keywords: Stars, variable ; Photometry, CCD
Keywords: distance scale - galaxies: dwarf - galaxies: individual (Draco) -
Local Group
Abstract:
We present the first CCD variability study of the Draco dwarf
spheroidal galaxy. The data were obtained with the Fred Lawrence
Whipple Observatory 1.2m telescope on Mount Hopkins, Arizona,
between 1998 August 19 and 1999 June 20, over 22 nights, over
a period of 10 months, covering a 22'x22' field centered at
α=17h19m57.5s, δ=57°50'05" (J2000.0). The analysis
of the BVI images produced 163 variable stars, 146 of which were
RR Lyrae: 123 RRab, 16 RRc, 6 RRd, and one RR12. The other variables
include a SX Phe star, four anomalous Cepheids, and a field eclipsing
binary. Using the short distance scale statistical parallax
calibration of Gould & Popowski (1998ApJ...508..844G 1998ApJ...508..844G) and 94 RRab
stars from our field, we obtain a distance modulus of
(m-M)0=19.40±0.02(stat)±0.15(syst)mag for Draco, corresponding
to a distance of 75.8±0.7(stat)±5.4(syst)kpc. By comparing the
spread in magnitudes of RRab stars in B, V, and I, we find no evidence
for internal dust in the Draco dwarf spheroidal galaxy. The catalog of
all variables, as well as their photometry and finding charts, is
available electronically via anonymous ftp and the World Wide Web. The
complete set of the CCD frames is available upon request.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 153 RR Lyrae Stars in the Draco Dwarf,
data from erratum, 2008, AJ, 136, 896
table2.dat 98 17 Other Variables in the Draco Dwarf
data from erratum, 2008, AJ, 136, 896
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See also:
J/AJ/110/2131 : M/L for Draco and UMi. I. (Armandroff+ 1995)
J/AJ/121/841 : RV photometry of Draco dwarf spheroidal galaxy (Piatek+, 2001)
J/AJ/123/2511 : RV photometry of Draco dwarf spheroidal galaxy (Piatek+, 2002)
J/AJ/124/3222 : VI photometry of Draco and UMi galaxies (Bellazzini+, 2002)
J/AJ/127/861 : RR Lyrae in Draco dSph (Bonanos+, 2004)
J/ApJS/145/245 : SDSS stars in Draco dwarf spheroidal galaxy (Rave+, 2003)
J/MNRAS/330/792 : Radial velocity in Draco (Kleyna+, 2002)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [Draco ]
7- 24 A18 --- Name Variable name (JHHMMSS.s+DDMMSS.s) (1)
26- 32 F7.5 d Per ? Period
33 A1 --- n_Per [*d] Flag on Per (2)
35- 39 F5.3 d Per2 ? Second period value
41- 45 F5.3 d Per3 ? Third period value
47- 52 F6.3 mag Vmag ? Intensity-averaged V-band magnitude
54- 59 F6.3 mag Imag ? Intensity-averaged I-band magnitude
61- 66 F6.3 mag Bmag ? Intensity-averaged B-band magnitude
68- 72 F5.3 mag AmpV ? The V-band amplitude
74- 79 A6 --- Type Variable type
81- 83 A3 --- --- [BS-]
84- 86 I3 --- BASV ? Name given in Baade & Swope
(1961AJ.....66..300B 1961AJ.....66..300B)
88- 98 A11 --- Com Additional comments
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Note (1): We use these derived J2000.0 equatorial coordinates to
name the variables in the format 'Draco Jhhmmss.s+ddmmss.s'.
The first three fields (hhmmss.s) correspond to right ascension,
and the last three (ddmmss.s) to declination, separated by the
declination sign. [BSS2004] Draco JHHMMSS.s+DDMMSS.s in Simbad.
Note (2): Note on Per:
* = Different period from that found by Baade & Swope, 1961AJ.....66..300B 1961AJ.....66..300B
d = Star with no period in Baade & Swope, 1961AJ.....66..300B 1961AJ.....66..300B.
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History:
* 02-Jul-2004: From electronic version of the journal
* 03-Dec-2004: 'J' added in star names, and the cross-identification
of Draco J171939.9+575753.5 with BASV 196 is marked suspect (with
a question mark)
* 15-Jan-2011: Tables 1 and 2 corrected, from erratum, 2008, AJ 136, 896
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 15-Jan-2011