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J/A+AS/116/75 Region of the open cluster Tr 14 (Vazquez+, 1996)
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Investigation on the region of the open cluster Tr 14
Vazquez R.A., Baume G., Feinstein A., Prado P.
<Astron. Astrophys. Suppl. Ser. 116, 75 (1996)>
=1996A&AS..116...75V (SIMBAD/NED BibCode)
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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:
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RA (2000) DE Name
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10 43 57.4 -59 32 51 HD 93129AB
10 44 08.87 -59 34 34.7 HD 93161EW
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File Summary:
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FileName Lrecl Records Explanations
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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
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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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
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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
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(End) Patricia Bauer [CDS] 5-Jan-1996