J/MNRAS/289/745 Mira variables in NGC 6749 field (Rosino+, 1997)
NGC 6749: a metal-poor halo globular cluster in a disc field rich in
Mira variables.
Rosino L., Ortolani S., Barbuy B., Bica E.
<Mon. Not. R. Astron. Soc. 289, 745 (1997)>
=1997MNRAS.289..745R 1997MNRAS.289..745R
ADC_Keywords: Clusters, globular ; Stars, variable ; Magnitudes
Keywords: stars: variables: other - globular clusters: individual: NGC 6749 -
Galaxy: halo
Abstract:
We present V, I photometry of the loose star cluster NGC 6749, and for
the first time colour-magnitude diagrams are provided. We confirm
that it is a globular cluster and its blue horizontal branch indicates
that it is metal-poor. We derive a reddening of E(B-V)=1.39±0.04
and a distance from the Sun d☉=7.3±0.9kpc (assuming a
total-to-selective absorption R=3.4). The cluster is projected very
close to the Galactic plane, and the derived distance implies a
Galactic coordinate Z~-300pc. It is thus a halo globular cluster
located close to the disc plane. We also discuss the properties of 78
newly discovered long-period variable stars, of which 75 are Miras,
projected within 1° of the cluster centre. The variables do not
appear to be associated with the globular cluster. From their periods,
most of them belong to the metal-rich disc or bulge stellar
populations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 60 78 Mira variables in the NGC 6749 field
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See also:
J/other/IBVS/5187 : Red variables near NGC 6749 (Skiff, 2001)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- [ROB97] Designation (Cl* NGC 6749 ROB NNNNN in Simbad)
6 A1 --- --- [=]
7- 9 A3 --- n_[ROB97] Other designation
11- 12 I2 h RAh Right ascension (1950)
14- 15 I2 min RAm Right ascension (1950)
17- 18 I2 s RAs Right ascension (1950)
20 A1 --- DE- Declination sign (1950)
21- 22 I2 deg DEd Declination (1950)
24- 27 F4.1 arcmin DEm Declination (1950)
29- 35 I7 d T0 ? Starting date for the phase calculation
corresponding to the maximum in Julian days
36 A1 --- u_T0 Uncertainty flag on T0
38- 42 F5.1 d Per ? Period
43 A1 --- u_Per Uncertainty flag on Per
46- 49 F4.1 mag Imax Maximum I Cousins magnitude
50 A1 --- u_Imax Uncertainty flag on Imax
52- 55 F4.1 mag Imin Minimum I Cousins magnitude
56 A1 --- u_Imin Uncertainty flag on Imin
58- 60 A3 --- Notes Individual notes (1)
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Note (1): 75 variables are Mira type, 3 are red irregular (Irr)
or semiregular (SR)
Three Mira variables already known in the field, namely V810,
V1115, and V1192, are not reported in the table.
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History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 13-May-2002