J/A+A/399/105 Radial velocities of red giants in NGC 1817 (Mermilliod+, 2003)
Red giants in open clusters: X. NGC 1817
Mermilliod J.-C., Latham D.W., Glushkova E.V., Ibrahimov M.A.,
Batirshinova V.M., Stefanil R.P., James D.J
<Astron. Astrophys. 399, 105 (2003)>
=2003A&A...399..105M 2003A&A...399..105M
ADC_Keywords: Clusters, open ; Stars, giant ; Radial velocities
Keywords: : open clusters and associations: individual: NGC 1817 -
stars: binaries: spectroscopic - techniques: radial velocities -
stars: AGB and post-AGB
Abstract:
Radial-velocity and BV CCD observations of 29 red-giant candidates in
the central part of the intermediate-age open cluster NGC 1817 have
confirmed the membership of 21 stars. In addition, we have used radial
velocities and new UBVR photoelectric photometry to investigate the
membership of 59 new candidates located in an outer corona surrounding
NGC 1817, identified from the POSS plates. We have confirmed 18 new
members out to a distance of 27' from the centre, thus doubling the
previous cluster radius. Ten definite spectroscopic-binary members
have been discovered, corresponding to a binary frequency of 25.6% and
four orbits have been determined so far. Three additional stars have
been identified as possible spectroscopic-binary members. We derive a
cluster mean velocity of +65.33±0.09 (0.52 s.e.) km/s based on 29
members with no detected velocity variations plus the 3 binary members
with orbital solutions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 42 85 Positions from WEBDA database
table1.dat 50 313 Radial-velocity data
table2.dat 51 29 CCD BV and radial-velocity results for the
inner red giants
table3.dat 99 59 Photoelectric UBVR and radial-velocity results
for the outer red giants
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See also:
J/A+A/299/53 : Red giants in NGC 3680 and IC 4651 (Mermilliod+, 1995)
J/A+A/307/80 : Velocities of red giants in NGC 2099 (Mermilliod+ 1996)
J/A+A/324/91 : Melotte 71 red giants radial velocities (Mermilliod+ 1997)
J/A+A/339/423 : Velocities of red giants in NGC 752 (Mermilliod+ 1998)
J/A+A/375/30 : Radial velocities in open clusters (Mermilliod+, 2001)
J/A+AS/134/301 : NGC 2354 red giants (Claria+ 1999)
J/A+A/423/189 : NGC 2477 red giants UBV phot. & RV (Eigenbrod+, 2004)
Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- WEBDA WEBDA star number (G1)
7 I1 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 17 F6.3 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 30 F5.2 arcsec DEs Declination (J2000)
32 A1 --- Note [*] *: positions from USNO-A2.0 (Cat. I/253)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- --- [NGC 1817] Cluster name
11- 14 I4 --- WEBDA WEBDA star number (G1)
16 A1 --- Tel Telescope/instrument designation (2)
20- 30 F11.3 d HJD Heliocentric Julian Date
37- 43 F7.2 km/s RV Radial velocity
47- 50 F4.2 km/s e_RV Error on the radial velocity
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Note (2): Telescope/instrument designation :
C : Coravel, on OHP Swiss 1m-telescope
M : MMT
T : Tillinghast reflector
W : Wyeth reflector
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- WEBDA WEBDA star number (G1)
6- 9 I4 --- HH ? Harris & Harris (1977AJ.....82..612H 1977AJ.....82..612H) number
11- 15 F5.2 mag Vmag ? V magnitude
17- 21 F5.2 mag B-V ? B-V colour index
23- 28 F6.2 km/s RV Radial velocity
30- 33 F4.2 km/s e_RV rms uncertainty on RV
35- 36 I2 --- o_RV Number of observation in RV
38- 41 I4 d DT Time interval spanned by the observations
43- 47 F5.3 --- P(chi2) Probability that the scatter is only due
to random noise
49- 51 A3 --- Rem Remarks (1)
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Note (1): Notes:
SB: spectroscopic binary
SBO: single-lined orbit determined
NM: non-member
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Mem [M Mn] M: Member, nM: no member
4- 7 I4 --- WEBDA Star number (G1)
9- 10 I2 --- EG [1/59] Giant number
12- 14 I3 --- [BTZ98] ? Balaguer-Nunez et al., 1998,
Cat. J/A+AS/133/387 number
18 I1 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 39 F4.1 arcsec DEs Declination (J2000)
41- 43 F3.2 --- Pmemb ? Probabylity of membership
45- 49 F5.2 mag Vmag V magnitude
52- 55 F4.2 mag U-B U-B colour index
57- 60 F4.2 mag B-V B-V colour index
62- 65 F4.2 mag V-R V-R colour index
67 I1 --- o_Vmag Number of observations in UBVR
69- 75 F7.2 km/s RV Radial velocity
78- 81 F4.2 km/s e_RV rms uncertainty on RV
83- 84 I2 --- o_RV Number of observations in RV
86- 89 I4 --- DT ? Time interval spanned by the observations
91- 95 F5.3 --- P(chi2) ? Probability that the scatter is only due
to random noise
97- 99 A3 --- Com SB: spectroscopic binary
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Global notes:
Note (G1): Numbering systems used in NGC 1817:
No. 1-283: Cuffey, 1938AnHar.106...39C 1938AnHar.106...39C
No. 289-390: Harris & Harris, 1977AJ.....82..612H 1977AJ.....82..612H
No. >1000: Tian et al. 1983, Annals Shanghai Obs. 5, 227
See the WEBDA database, http://obswww.unige.ch/webda/navigation.html
for cross-identifications.
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Acknowledgements: Jean-Claude Mermilliod
References:
Mermilliod & Mayor, Paper I 1989A&A...219..125M 1989A&A...219..125M
Mermilliod et al., Paper II 1989A&AS...79...11M 1989A&AS...79...11M
Mermilliod & Mayor, Paper III 1990A&A...237...61M 1990A&A...237...61M
Mermilliod et al., Paper IV 1995A&A...299...53M 1995A&A...299...53M, Cat. J/A+A/299/53
Mermilliod et al., Paper V 1996A&A...307...80M 1996A&A...307...80M, Cat. J/A+A/307/80
Mermilliod et al., Paper VI 1997A&A...319..481M 1997A&A...319..481M, Cat. J/A+A/319/481
Mermilliod et al., Paper VII 1997A&A...324...91M 1997A&A...324...91M, Cat. J/A+A/324/91
Mermilliod et al., Paper VIII 1998A&A...339..423M 1998A&A...339..423M, Cat. J/A+A/339/423
Mermilliod et al., Paper IX 2001A&A...375...30M 2001A&A...375...30M, Cat. J/A+A/375/30
(End) Patricia Bauer [CDS] 03-Dec-2002