J/A+AS/118/407 CCD photometry & velocities of NGC 3680 stars (Nordstroem+ 1996)
Critical tests of stellar evolution in open clusters.
I. New photometry and radial velocities for NGC 3680
Nordstroem B., Andersen J., Andersen M.I.
<Astron. Astrophys. Suppl. Ser. 118, 407 (1996)>
=1996A&AS..118..407N 1996A&AS..118..407N (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, CCD ; Radial velocities
Keywords: stars: evolution - stars: fundamental parameters -
stars: HR diagram - stars: kinematics -
open clusters and associations: NGC 3680
Description:
We present new CCD photometry in the b and y colours of the Stroemgren
uvby system for 310 stars in a 13'x13' field centered on the
intermediate-age open cluster NGC 3680. Careful cross-checks indicate
that previously published BV photometry of NGC 3680 is affected by
random and/or systematic errors precluding its use in critical
comparison with theoretical isochrone computations. Detailed notes on
several individual stars are given. In addition, we present ≃400 new
photoelectric radial-velocity observations of 109 stars obtained with
the CORAVEL scanner during the period 1988-1994. These data allow
substantially complete identification of member and non-member stars
in the field, and of spectroscopic binaries in both groups. Rotational
velocities have also been derived for the programme stars, and our
velocity variability criteria for stars of all rotations are
described. The further astrophysical discussion of the data, including
the definition of radial-velocity membership criteria, theoretical
isochrone fitting, and the dynamical state of the cluster and the
origin of its "bimodal turnoff", will appear in a separate paper
(Nordstroem et al. 1996).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 44 352 Coordinates and CCD photometry for 352 stars
in the field of NGC 3680
table2 79 109 Mean radial and rotational velocities and
derived parameters for 109 stars in the field
of NGC 3680
table3 46 366 Individual radial-velocity observation of the
stars in table2
tables.tex 82 1059 LaTeX version of the tables
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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- 4 I4 --- No [1/9041] Identification number from paper
5- 7 A3 --- m_No Multiplicity index on No
9- 10 I2 h RAh Right Ascension (J2000)
12- 13 I2 min RAm Right Ascension (J2000)
15- 18 F4.1 s RAs Right Ascension (J2000)
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs Declination (J2000)
32- 37 F6.3 mag Vmag ? V magnitude
40- 44 F5.3 mag b-y ? b-y color index in Stroemgren system
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 4 I4 --- No [1/7020] Identification number from paper
5- 7 A3 --- m_No Multiplicity index on No
9- 12 I4 --- KP Number in Kozhurina-Platais et al. (1995)
14- 19 F6.2 km/s RV Mean radial velocity
21- 25 F5.2 km/s e_RV Mean error of mean radial velocity
27- 28 I2 --- o_RV Number of radial-velocity observations
31- 35 F5.2 km/s sigmaO Observed standard deviation (one obs.)
37- 40 F4.2 km/s sigmaP Predicted standard deviation (one obs.)
42- 46 F5.2 --- O/Psigma ?=99.99 ratio observed/predicted standard
deviations
49- 53 F5.3 --- Prob ?=9.999 Probability that radial velocity is
constant
56- 59 F4.1 km/s RVtot ?=-9.99 total observed range in radial velocity
61- 64 I4 d Obs Time span covered by observations
67- 71 F5.2 km/s vsini ?=99.99 mean projected rotational velocity
73- 77 F5.2 km/s e_vsini ?=99.99 Mean error of rotational velocity
78- 79 A2 --- Com Comments, M: Data from Mermilliod et al. (1995)
*: See remark in paper itself
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 4 I4 --- No [1/7020] Identification number from paper
5- 7 A3 --- m_No Multiplicity index on No
9- 20 F12.4 d HJD Heliocentric Julian Date of observation
23- 28 F6.2 km/s RV Radial velocity (for double-lined binaries:
primary component data)
30- 33 F4.2 km/s e_RV Predicted uncertainty of observed velocity
35- 40 F6.2 km/s RV2 ? Radial velocity of the secondary component
for double-lined binaries
42- 45 F4.2 km/s e_RV2 ? Predicted uncertainty of observed velocity
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References:
Kozhurina-Platais V. et al., 1995, AJ 109, 672 =1995AJ....109..672K 1995AJ....109..672K
Mermilliod J.-C. et al., 1995, A&A 299, 53 =1995A&A...299...53M 1995A&A...299...53M
(End) Patricia Bauer [CDS] 18-Mar-1996