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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 60 78 Mira variables in the NGC 6749 field
See also: J/other/IBVS/5187 : Red variables near NGC 6749 (Skiff, 2001) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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)
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.
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 13-May-2002
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