J/A+A/426/819 NGC 1817 proper motions and membership (Balaguer-Nunez+, 2004)
New membership determination and proper motions of NGC 1817.
Parametric and non-parametric approach.
Balaguer-Nunez L., Jordi C., Galadi-Enriquez D., Zhao J.L.
<Astron. Astrophys. 426, 819 (2004)>
=2004A&A...426..819B 2004A&A...426..819B
ADC_Keywords: Clusters, open ; Proper motions
Keywords: Galaxy: open clusters and associations: individual: NGC 1817 -
Galaxy: open clusters and associations: individual: NGC 1807 -
astrometry - methods: data analysis
Description:
Absolute proper motions, their errors and membership probabilities
of 810 stars in the area of two NGC objects, NGC 1817 and NGC 1807.
The Tycho-2 Catalogue is used as the reference frame, and the
cross-identification is given. Parametric and non parametric
membership probabilities are compared based on there being only
one very extended physical cluster: NGC 1817.
Objects:
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RA (2000) DE Designation(s)
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05 12 06 +16 42.0 NGC 1817
05 10 42 +16 32.0 NGC 1807
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 88 810 Proper motions and memberships
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See also:
J/A+A/426/827 : NGC 1817 & NGC 1807 ubvyHβ phot. (Balaguer-Nunnez+ 2004)
J/A+AS/133/387 : NGC 1817 & NGC 1807 proper motions (Balaguer-Nunnez+ 1998)
J/A+A/399/105 : NGC 1817 red giants radial velocities (Mermilliod+, 2003)
J/A+A/388/168 : Absolute proper motions of 93 open clusters (Dias+, 2002)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential identification number
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 16 F6.3 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31- 38 F8.3 mas/yr pmRA Proper motion in alpha
40- 46 F7.3 mas/yr e_pmRA Error in pmRA
48- 55 F8.3 mas/yr pmDE Proper motion in delta
57- 63 F7.3 mas/yr e_pmDE Error in pmDE
65- 66 I2 --- N Number of plates used
68- 72 F5.2 --- PMP Parametric membership probability
74- 78 F5.2 --- PMNP Non-parametric membership probability
80- 83 I4 --- TYC1 ? TYC1 identification number
85- 88 I4 --- TYC2 ? TYC2 identification number
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Acknowledgements: Lola Balaguer-Nunnez
(End) L. Balaguer-Nunnez [Universitat de Barcelona] 22-Jul-2004