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J/PASP/110/1172          NGC 7789 radial velocities                 (Gim+, 1998)

The open cluster NGC 7789. I. Radial velocities for giant stars. Gim M., Hesser J.E., McClure R.D., Stetson P.B. <Publ. Astron. Soc. Pac. 110, 1172 (1998)> =1998PASP..110.1172G
ADC_Keywords: Clusters, open ; Radial velocities ; Stars, variable Keywords: galaxy: open clusters and associations: individual: NGC 7789 - stars: binaries: spectroscopic - techniques: radial velocities Abstract: A total of 597 radial velocity observations for 112 stars in the ∼1.6Gyr old open cluster NGC 7789 have been obtained since 1979 with the radial velocity spectrometer at the Dominion Astrophysical Observatory. The mean cluster radial velocity is -54.9±0.12km/s and the dispersion is 0.86km/s, from 50 constant velocity stars selected as members from this radial velocity study and the 1981 proper motion study of McNamara & Solomon (1981A&AS...43..337M). Twenty-five stars (32%) among 78 members are possible radial velocity variable stars, but no orbits are determined because of the sparse sampling. Seventeen stars are radial velocity nonmembers, while the membership estimates of six stars are uncertain. There is a hint that the observed velocity dispersion falls off at large radius: this may be due to the inclusion of long-period binaries preferentially in the central area of the cluster. The known radial velocity variables also seem to be more concentrated toward the center than members with constant velocity. Although this is significant at only the 85% level, when combined with the similar result of Raboud & Mermilliod (1994A&A...289..121R) for three other clusters, the data strongly support the conclusion that mass segregation is being detected. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 23 57 00 +56 42 54 NGC 7789 = C 2354+564 = OCl 269.0 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 30 592 Radial velocity spectrometer observational data table3.dat 70 124 Radial velocity results in NGC 7789
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Star name (1) 7- 17 F11.3 d HJD ? Heliocentric Julian date 19- 24 F6.2 km/s RV ? Radial velocity 26- 29 F4.2 km/s e_RV ? rms uncertainty on RV 30 A1 --- n_RV [ab] Note (2)
Note (1): K: Kuestner, 1923VeUSB..18.....K M: McNamara & Solomon, 1981A&AS...43..337M (Cl* NGC 7789 M NNNN in Simbad) Note (2): a: Unused because errors are greater than 1.0km/s b: Unused because the quality was deemed to be dubious
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Kuestner (1923) or McNamara & Solomon identification number 7- 11 A5 --- M McNamara & Solomon (1981A&AS...43..337M) identification number 13- 16 I4 --- G ? Gim (1998) identification number 18- 23 F6.3 mag Vmag ? V magnitude 25- 29 F5.3 mag V-I ? V-I colour index 31- 36 F6.2 km/s RV ? Radial velocity 38- 39 I2 10-2km/s e_RV ? rms uncertainty on RV (internal error) 41- 42 I2 --- o_RV ? Number of observations used in the statistical analysis 44- 50 F7.2 d Days ? Number of days between first and last observations 52- 56 F5.2 --- E/I ? External over internal errors ratio 58- 62 F5.3 --- P(chi2) ? Probability that velocity variations are due to random observational errors 64- 65 I2 --- Mempm ? Membership probability by proper motion (McNamara & Solomon, 1981A&AS...43..337M) 67 A1 --- MemRV [YN] Membership by radial velocity (Scott et al., 1995AJ....109.1706S) 69- 70 A2 --- Mem Membership adopted in this study (1)
Note (1): MC: members with constant velocity MV: members with variable velocity M: members with one or no velocity data NM: nonmembers U: stars with uncertain membership
History: From PASP electronic version References: Kustner, 1923, Veroeff. Univ. Sternw. Bonn, 18 Gim, 1998, M.Sc. thesis, Univ. Victoria McNamara & Solomon, 1981A&AS...43..337M
(End) James Marcout, Patricia Bauer [CDS] 08-Dec-1998
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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