J/A+AS/116/75 Region of the open cluster Tr 14 (Vazquez+, 1996) ================================================================================ Investigation on the region of the open cluster Tr 14 Vazquez R.A., Baume G., Feinstein A., Prado P. =1996A&AS..116...75V (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Photometry, UBVRI ; Clusters, open ; Keywords: open cluster: Tr 14 - stars: HD 93129AB, HD 93161EW - stars: mass function - stars: pre-main sequences - HR diagram Description: We present UBVRI CCD imaging photometry down to approximately V=19mag in the area of the very young open cluster Tr 14. Our results confirm the existence of an anomalous extinction law in the area if it is interpreted in terms of the UBVRI photometry. According to our analysis the cluster distance is d=3100 (V_0_-M_V_=12.50mag) and its age is 1.5+/-.5x10^6^y. We want to draw the attention on stars which, from the observed magnitude-spread at constant color, could be stars in an early stage of evolution. In that case, the observed spread leads to assume that the process of star formation in Tr 14 is continuous whereas, from pre-main sequence evolutionary tracks, a duration of about 5x10^6^y is deduced for it. The computation of the cluster initial mass function reveals a flat slop e even though it still compares to a Salpeter law. At the same time, we found a spatial variation of the cluster IMF, which could be explained by mass segregation in the star formation process. The cluster youth and its compact appearance seem to confirm that it is far from virial equilibrium. The observed tot al cluster mass is around 2000M_{sun}_ and its core contains about 40% of the total. Objects: --------------------------------------------------------------------- RA (2000) DE Name --------------------------------------------------------------------- 10 43 57.4 -59 32 51 HD 93129AB 10 44 08.87 -59 34 34.7 HD 93161EW --------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2 83 475 Observed colors and magnitudes in Tr 14 table2.tex 113 950 LaTeX version of table2 table5 56 331 Free reddening colors and magnitudes table5.tex 92 662 LaTeX version of table5 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 4 I3 --- No Sequence number 6- 11 A6 --- F Identification number in Feinstein, 1983 13- 15 I3 --- MJ []? Identification number in Massey & Johnson, 1993 17- 21 A5 --- CMDE Identification number in Cudworth et al., 1993 23- 29 F7.2 pix Xpos X position 31- 37 F7.2 pix Ypos Y position 39- 43 F5.2 mag Vmag V magnitude 44- 45 A2 --- u_Vmag [: ] uncertainty flag on Vmag (1) 47- 51 F5.2 mag B-V B-V color 52- 53 A2 --- u_B-V [: ] uncertainty flag on B-V (1) 55- 59 F5.2 mag U-B []? U-B color 60- 61 A2 --- u_U-B [: ] uncertainty flag on U-B (1) 63- 67 F5.2 mag V-R []? V-R color 68- 69 A2 --- u_V-R [: ] uncertainty flag on V-R (1) 71- 74 F4.2 mag V-I []? V-I color 75- 76 A2 --- u_V-I [: ] uncertainty flag on V-I (1) 78- 79 I2 % p []? Membership probability 81- 83 A3 --- Rem Remark (2) -------------------------------------------------------------------------------- Note (1): (:) errors larger than 0.04 (::) errors larger than 0.08 Note (2): m = likely member pm = probable member nm = non-member cs? = star assumed to be in contracting phase ? = uncertain membership. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 4 I3 --- No Sequence number 6- 10 F5.2 mag V0mag Free reddening V magnitude 12- 16 F5.2 mag (B-V)0 Free reddening B-V color 18- 21 F4.2 mag E(B-V) []? Color excess in B-V 22 A1 --- n_E(B-V) [*] An * indicates that mean color excess was used 23- 27 F5.2 mag (U-B)0 []? Free reddening U-B color 29- 32 F4.2 mag E(U-B) []? Color excess in U-B 33 A1 --- n_E(U-B) [*] An * indicates that mean color excess was used 34- 39 F6.3 mag MV V absolute magnitude 41- 44 F4.2 K log(Teff) Effective temperature 46- 49 F4.2 solLum logL Luminosity 51- 56 F6.2 solMass logM Present day stellar mass -------------------------------------------------------------------------------- References: Feinstein A., 1983 Astrophys. Space Sci., 96, 293 =1983Ap&SS..96..293F Massey P. & Johnson J., 1993 Astron. J., 105, 980 =1993AJ....105..980M Cudworth K.M. et al., 1993 Astron. J., 105, 1822 =1993AJ....105.1822C ================================================================================ (End) Patricia Bauer [CDS] 5-Jan-1996