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J/ApJ/549/578 BV photometry of Trumpler 14 and 16 (Degioia-Eastwood+, 2001)
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The star formation history of Trumpler 14 and Trumpler 16.
Degioia-Eastwood K., Throop H., Walker G., Cudworth K.M.
<Astrophys. J. 549, 578 (2001)>
=2001ApJ...549..578D
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ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, CCD ;
Photometry, UBV
Keywords: stars: formation - stars: pre-main-sequence
Abstract:
H-R diagrams are presented for the very young galactic clusters
Trumpler 14 and Trumpler 16, which are the two most populous clusters
in the region of vigorous star formation surrounding {eta} Carinae.
Point spread function photometry of UBV CCD images is presented down
to V~19 for over 560 stars in Tr 16 and 290 stars in Tr 14. We have
also obtained similar data for a local background field. After
determining cluster membership through proper motions from a previous
work, we find that the reddening of cluster members is significantly
lower than that of the local background stars. Thus, we are able to
use individual reddenings to identify likely members at far deeper
levels than possible with proper motions. This work has revealed a
significant population of pre-main-sequence (PMS) stars in both
clusters. The location of the PMS stars in the H-R diagram indicates
that the theoretical "stellar birthline" of Palla & Stahler
(1990ApJ...360L..47P, follows the locus of stars far better than that
of Beech & Mitalas (1994ApJS...95..517B). Comparison with both pre-
and post-main-sequence isochrones also reveals that although
intermediate-mass stars have been forming continuously over the last
10Myr, the high-mass stars formed within the last 3Myr. There is no
evidence that the formation of the intermediate-mass stars was
truncated by the formation of the high-mass stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 290 Trumpler 14: new photometry and
astrometric positions for J2000
table2.dat 41 563 Trumpler 16: new photometry and
astrometric positions for J2000
table3.dat 52 74 Cross-identifications for some stars
table4.dat 60 24 Stars used for spectroscopic parallax
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See also:
J/A+AS/116/75 : Region of the open cluster Tr 14 (Vazquez+, 1996)
J/AJ/105/980 : Stellar content of Tr 14 and Tr 16 (Massey+ 1993)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000) (1)
4- 5 I2 min RAm Right ascension (J2000) (1)
7- 11 F5.2 s RAs Right ascension (J2000) (1)
13 A1 --- DE- Declination sign (J2000) (1)
14- 15 I2 deg DEd Declination (J2000) (1)
17- 18 I2 arcmin DEm Declination (J2000) (1)
20- 23 F4.1 arcsec DEs Declination (J2000) (1)
25- 29 F5.2 mag Vmag V band magnitude
31- 35 F5.2 mag B-V The B-V color
37- 40 F4.2 mag U-B ? The U-B color
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Note (1): The full designation of a star in these tables, as recommended
by the IAU, is Tr 14:DETWC JHHMMSS.s{+/-}DDMMSS for Tr 14 and Tr
16:DETWC JHHMMSS.s{+/-}DDMMSS for Tr 16 where the coordinates have
been truncated, not rounded. The acronym ``DETWC'' indicates the
authors, and the prefix ``J'' indicates that the coordinates are for J2000.
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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- 29 A29 --- DETWC Star designation
31- 36 A6 --- Fes Feinstein et al., 1973A&AS...12..331F,
designation, Cl Trumpler NN NNN in Simbad
38- 40 I3 --- MJ ? Massey & Johnson, 1993, Cat. <J/AJ/105/980>
designation, Cl* Trumpler NN MJ NNN in Simbad
42- 52 A11 --- Other Other names (1)
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Note (1): A "Y" designation refers to the numbering in Cudworth et al., 1993,
Cat. <J/AJ/105/1822>, Cl* Trumpler 14 Y NNN in Simbad.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name (1)
13- 14 I2 % Memb Membership probability
16- 24 A9 --- SpType Spectral type
26- 27 A2 --- r_SpType Reference for spectral type (2)
29- 33 F5.2 mag Vmag V magnitude
35- 38 F4.2 mag B-V B-V colour index
40- 43 F4.1 mag VMAG Absolute V magnitude
45- 49 F5.2 mag (B-V)0 Dereddened B-V colour index
51- 54 F4.2 mag AV Absorption in V band
56- 60 F5.2 mag V0-MV Dereddened minus absolute V magnitude
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Note (1): Stars which are from neither the HD nor CPD catalog are referred to by
their numbering designated in Feinstein et al., 1973A&AS...12..331F.
Note (2): References:
W: Walborn, 1973ApJ...179..517W
M: Morrell et al., 1988PASP..100.1431M
MJ: Massey & Johnson, 1993, Cat. <J/AJ/105/980>
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History:
From electronic version of the journal
In table3.dat, one correction on 12-Jul-2001
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 17-May-2001