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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
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:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        56       12   RR Lyrae properties
lc.dat            32      705   VI light curves


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   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)

Note (1): From Cohen et al., 2011ApJ...727....9C.



Byte-by-byte Description of file: lc.dat

   Bytes Format Units   Label     Explanations

   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


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    21-Apr-2012