J/other/PASA/29.72 RR Lyrae in NGC 6101 (Fitzgerald+, 2012)
RR Lyrae stars in the globular cluster NGC 6101.
Fitzgerald M., Criss J., Lukaszewicz T., Frew D.J., Catelan M.,
Woodward S., Danaia L., McKinnon D.H.
<Publ. Astron. Soc. Australia, 29, 72-77 (2012)>
=2012PASA...29...72F 2012PASA...29...72F
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry
Keywords: globular clusters: individual (NGC 6101) - RR Lyrae variable
Abstract:
V- and I-band observations were taken over 9 months to study the RR
Lyrae population in the metal-poor diffuse globular cluster NGC 6101.
We identify one new variable, which is either a potential long-period
red giant variable or eclipsing binary, and recover all previously
identified RR Lyraes. One previously studied RR Lyrae is reclassified
as an RRc type, while two period estimations have been significantly
refined. We confirm that NGC 6101 is Oosterhoff type II with a high
ratio of n(c)/n(ab+c)=0.833 with a very long mean RRab period of
0.86d. By using theoretical RR Lyrae period-luminosity-metallicity
relations, we use our V- and I-band RR Lyrae data to gain an
independent estimate of the reddening towards this cluster of
E(B-V)=0.15±.04 and derive a distance of 12.8±0.8kpc. The majority
of the work in this study was undertaken by upper secondary school
students involved in the Space to Grow astronomy education project in
Australia.
Description:
V- and I-band observations of cluster NGC 6101 were taken over 31
nights between June 2010 and April 2011 using the Merope CCD camera
attached to the robotically controlled 2-metre Faulkes Telescope South
at Siding Spring Observatory, NSW, Australia.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 12 RR Lyrae properties
lc.dat 32 705 VI light curves
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Star Star name (<Cl* NGC 6101 SAW VNN> in Simbad)
5- 10 F6.4 d Per Period
12- 16 F5.2 mag <Vmag> Average V magnitude ((Vmin+Vmax)/2)
18- 21 F4.2 mag <V-I> Average V-I index (<Vmag>-<Imag>)
23- 28 A6 --- Type RR Lyrae type
30- 33 F4.2 mag AV Absorption in V band
35- 36 I2 h RAh Right ascension (J2000) (1)
38- 39 I2 min RAm Right ascension (J2000) (1)
41- 44 F4.1 s RAs Right ascension (J2000) (1)
46 A1 --- DE- Declination sign (J2000) (1)
47- 48 I2 deg DEd Declination (J2000) (1)
50- 51 I2 arcmin DEm Declination (J2000) (1)
53- 56 F4.1 arcsec DEs Declination (J2000) (1)
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Note (1): From Cohen et al., 2011ApJ...727....9C 2011ApJ...727....9C.
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Byte-by-byte Description of file: lc.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Star Star name (<Cl* NGC 6101 SAW VNN> in Simbad)
5 A1 --- Band [VI] Observed band
7- 19 F13.5 d JD Julian date
21- 26 F6.3 mag mag Observed magnitude in Band
28- 32 F5.3 mag e_mag rms uncertainty on mag
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Apr-2012