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. =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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- References: Kozhurina-Platais V. et al., 1995, AJ 109, 672 =1995AJ....109..672K Mermilliod J.-C. et al., 1995, A&A 299, 53 =1995A&A...299...53M ================================================================================ (End) Patricia Bauer [CDS] 18-Mar-1996