J/A+A/291/121 Study of star V9 in 47 Tuc (Storm+ 1994)
A Baade-Wesselink analysis of the RR Lyrae star V9 in 47 Tucanae.
STORM J., NORDSTROEM B., CARNEY B.W., ANDERSEN J.
<Astron. Astrophys. 291, 121 (1994)>
=1994A&A...291..121S 1994A&A...291..121S (SIMBAD/NED Reference)
ADC_Keywords: Stars, variable ; Photometry, infrared ; Radial velocities
Keywords: stars: fundamental parameters - stars: absolute magnitudes -
stars; horizontal branch - stars: variables: other (RR Lyrae) -
globular clusters: individual: 47 Tuc
Description:
We present an infrared K-band light curve and a radial velocity curve
for the RR Lyrae star V9 in the metal rich globular cluster 47 Tucanae
([Fe/H]=-0.71). Combining these new data with the optical photometry
presented in Carney et al. (1993PASP..105..294C 1993PASP..105..294C), we perform a
Baade-Wesselink analysis and derive a distance modulus of 47 Tuc of
13.23mag±0.17 and absolute mean magnitudes of <MV≥0.32mag and
<MK≥-0.57mag for V9. We also present a well populated
visual-infrared color-magnitude diagram of the cluster, reaching from
the upper red giant branch to the subgiant branch.
Objects:
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RA (2000) DE Name
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00 23.6 -72 05 47 Tuc V9 = HV 810
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 32 97 K magnitudes for V9
table2 43 116 Infrared-optical color-magnitude data for 47 Tuc
table3 56 71 Radial velocities for V9 in 47 Tuc
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date at mid-exposure
14- 19 F6.4 --- Phase [0/1[ Phase computed according to the ephemeris
HJD(max) = 2447485.385 + 0.736852 * E (days)
21- 26 F6.3 mag Kmag Average K-band magnitude computed after
binning the data according to time in bins of
11 measurements and rejecting 3 sigma outliers
iteratively.
28- 32 F5.3 mag e_Kmag rms uncertainty on Kmag
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Sequential number
5- 11 F7.3 pix Xpos X coordinate in the IR detector frame
12- 18 F7.3 pix Ypos Y coordinate in the IR detector frame
20- 25 F6.3 mag K0mag Dereddened K magnitude of the star
27- 31 F5.3 mag e_K0mag rms uncertainty on K0mag
33- 37 F5.3 mag (V-K)0 Dereddened (V-K) color of the star
39- 43 F5.3 mag e_(V-K)0 rms uncertainty on (V-K)0
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date at mid-exposure
14- 19 F6.4 --- Phase [0/1[ Phase computed according to the ephemeris
HJD(max) = 2447485.385 + 0.736852 * E (days)
21- 25 F5.1 km/s RV Radial velocity
27- 29 F3.1 km/s e_RV rms uncertainty on RV
31- 35 F5.3 --- Depth ? Depth of the CORAVEL cross-correlation dip
37- 41 F5.3 --- e_Depth ? rms uncertainty on Depth
43- 46 F4.1 km/s Width ? Width of the CORAVEL cross-correlation dip
48- 50 F3.1 km/s e_Width ? rms uncertainty on Width
52- 55 I4 --- N Average number of counts per channel for the
measurement
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Courtesy: Jesper Storm
(End) Patricia Bauer [CDS] 12-Apr-1996