J/AcA/63/91 V-band light curves of variables in M80 (Kopacki, 2013)
Variable stars in the globular cluster M 80.
Kopacki G.
<Acta Astron., 63, 91-107 (2013)>
=2013AcA....63...91K 2013AcA....63...91K
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry
Keywords: stars: population II - stars: variables: RR Lyrae -
globular clusters: individual: M 80
Abstract:
We present results of a search for variable stars in the globular
cluster M 80. Application of the image subtraction method to the
ground-based times-series of CCD frames resulted in finding nine new
RR Lyr stars, six of the RRc and three of the RRab type, and four SX
Phe variables.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 75 29 periods and amplitudes of the observed variables
phot/* . 28 Individual light curves
--------------------------------------------------------------------------------
See also:
J/AJ/116/2415 : CCD UBVRI Photometry of M80 (Alcaino+ 1998)
J/ApJ/710/332 : Far-UV sources in M80 (Dieball+, 2010)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- --- [v]
2- 3 I02 --- Var [1/33] Variable number (1)
6- 7 I2 h RAh Right Ascension J2000 (hours)
9- 10 I2 min RAm Right Ascension J2000 (minutes)
12- 16 F5.2 s RAs Right Ascension J2000 (seconds)
18 A1 --- DE- Declination J2000 (sign)
19- 20 I2 deg DEd Declination J2000 (degrees)
22- 23 I2 arcmin DEm Declination J2000 (minutes)
25- 28 F4.1 arcsec DEs Declination J2000 (seconds)
30- 35 F6.3 mag <Vmag> ?=- Mean V magnitude
37- 42 F6.3 mag Vmag ?=- Maximum V magnitude
44- 48 F5.3 mag V-Ic ?=- (V-Ic) color index
50- 54 F5.3 mag Vamp ?=- V-band amplitude ΔV
55 A1 --- n_Per [*] indicates a multiperiodic variable (2)
57- 65 F9.6 d Per ?=- Period of variability
68- 75 A8 --- Vtype Variability type (3)
--------------------------------------------------------------------------------
Note (1): the photometric observations of each star are available in the
"phot" subdirectory, as a file named "vNN.dat" where NN is the number.
The star is named <Cl* NGC 6093 SAW VNN> in Simbad.
Note (2): the alternative periods are:
* for v16: P=0.3339, ΔV=0.061; P=0.580, ΔV=0.021
* for v24: P=0.048409, ΔV=0.055
* for v33: no light curve, period and position from Thomson et al.
(2010MNRAS.406.1084T 2010MNRAS.406.1084T)
Note (3): Variability types are:
RR Lyr = 15 stars (7 RRab, 8 RRc variables)
SX Phe = 5 stars (4 new)
W UMa = 2 stars (eclipsing binaries)
W Vir = 1 star
VRG = Variable Red Giant, 3 stars
const = non-variable (constant), 1 star
unknown = periodical variable of unknown type (v28 and v29)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: phot/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 13 F12.6 d HJD Heliocentric Julian Day (HJD-2400000)
15- 26 F12.4 --- FV V-filter differential flux derived from the
image subtraction (ISM) reductions (1)
28- 36 F9.4 --- e_FV Error of the differential flux
--------------------------------------------------------------------------------
Note (1): Note that differential flux in the Image Subtraction Method (ISM)
is defined as a difference between star's flux in the reference frame
and in the current frame. Thus its scale is reversed in the sense that
smaller differential flux means that the star is brighter.
--------------------------------------------------------------------------------
History:
Copied at ftp://sirius.astrouw.edu.pl/acta/2013/kop_91
(End) Patricia Vannier [CDS] 17-May-2013