J/AJ/109/1903 Membership to cluster IC 4756 (Missana+ 1995)
Amendment of our method for deriving stellar membership of an open cluster
Missana M., Missana N.
<Astron. J. 109, 1903 (1995)>
=1995AJ....109.1903M 1995AJ....109.1903M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open
Abstract:
Our method for determining statistically the members of an open
cluster by means of the proper motions (Missana et al.,
(1990AJ....100.1850M 1990AJ....100.1850M) is amended and its validity is verified by
applying it to the cluster IC 4756 with the data given by Herzog et
al. (1975A&AS...19..211H 1975A&AS...19..211H), adding nothing to their results. In the
computation of the dispersion ellipses of the samples and of the
χ2 for deriving the significance levels, the weights of the
proper motions have been taken into account. The results obtained by
the criterion of the χ2 and those obtained by Herzog et al. by
the criterion of the maximum likelihood of Sanders
(1971A&A....14..226S 1971A&A....14..226S) are concordant.
Objects:
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RA (2000) DE Designation(s)
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18 39.0 +05 28 IC 4756 = C 1836+054
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 42 464 Membership probabilities to IC 4756
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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- 3 I3 --- Star Number of the star in Herzog et al.
(1975A&AS...19..211H 1975A&AS...19..211H)
9- 12 F4.2 --- Mi Membership probability P(C/A). (1)
13 A1 --- n_Mi [*&] * and & indicate that the star belongs to
the set of 174 and 109 cluster members
respectively.
16- 19 F4.2 --- HS Membership probability according to
Herzog et al. ((1975A&AS...19..211H 1975A&AS...19..211H)
22 A1 --- MF [MF] Cluster member (M) or field star (F) as
per phot. estimates by Herzog et al.
26 A1 --- B [B] B: Blue straggler.
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Note (1): Probable member if P(C/A)≥0.5.
See Missana et al., 1990AJ....100.1850M 1990AJ....100.1850M, for more details.
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 07-Apr-1997