J/other/ChJAA/6.435 Proper motions in NGC 6530 (Zhao+, 2006)
Membership and segregation effects in the young open cluster NGC 6530.
Zhao J.-L., Chen L., Wen W.
<Chinese J. Astron. Astrophys., 6, 435 (2006)>
=2006ChJAA...6..435Z 2006ChJAA...6..435Z
ADC_Keywords: Clusters, open ; Proper motions
Keywords: open clusters and associations: individual (NGC 6530)
Abstract:
From photographic plate data of Shanghai Astronomical Observatory with
a time baseline of 87 years, proper motions and membership
probabilities of 364 stars in the open cluster NGC 6530 region are
reduced. On the basis of membership determination, luminosity function
and segregation effect of the cluster are discussed with details.
Spatial mass segregation is obviously present in NGC 6530 while there
is no clear evidence for a velocity-mass (or velocity-luminosity)
dependence. The observed spatial mass segregation for NGC 6530 might
be due to a combination of initial conditions and relaxation process.
Description:
The six photographic plates used for proper motion reduction of the
open cluster NGC 6530 were all taken by the 40cm double astrograph
with focal length of 6.9m at Sheshan (Zo Se) Station of Shanghai
Astronomical Observatory, Chinese Academy of Sciences, with two first
epoch plates and four second epoch ones taken in 1912 and 1999
respectively, with a time baseline extending over 87 years.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 65 364 Proper motions and membership probabilities of
364 stars in the region of NGC 6530
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See also:
J/A+AS/123/63 : NGC 6530 multi-wavelength photometry (van den Ancker+ 1997)
J/AJ/120/333 : UBVRI and Hα in NGC 6530 (Sung+, 2000)
J/A+A/395/499 : XMM observations in M8 and NGC6530 (Rauw+, 2002)
J/ApJ/608/781 : NGC 6530 Chandra X-ray catalog (Damiani+, 2004)
J/A+A/430/941 : Star formation region NGC 6530 (Prisinzano+, 2005)
J/A+A/462/123 : VLT/Flames spectroscopic data of NGC 6530 (Prisinzano+, 2007)
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 number,
Cl* NGC 6530 ZCW NNN in Simbab
7- 8 I2 h RAh Right ascension (J2000.0)
10- 11 I2 min RAm Right ascension (J2000.0)
13- 18 F6.3 s RAs Right ascension (J2000.0)
21 A1 --- DE- Declination sign (J2000.0)
22- 23 I2 deg DEd Declination (J2000.0)
25- 26 I2 arcmin DEm Declination (J2000.0)
28- 32 F5.2 arcsec DEs Declination (J2000.0)
35- 40 F6.2 mas/yr pmRA Proper motion along right ascension
43- 46 F4.2 mas/yr e_pmRA rms uncertainty on pmRA
49- 53 F5.2 mas/yr pmDE Proper motion along declination
56- 59 F4.2 mas/yr e_pmDE rms uncertainty on pmDE
62- 65 F4.2 --- PMemb Membership probability
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Jun-2007