J/A+A/531/A141 Physical parameters of PMS in open clusters (Delgado+, 2011)
Physical parameters of pre-main sequence stars in open clusters.
Delgado A.J., Alfaro E.J., Yun J.L.
<Astron. Astrophys. 531, A141 (2011)>
=2011A&A...531A.141D 2011A&A...531A.141D
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Stars, dwarfs ;
Photometry, UBVRI ; Stars, ages ; Stars, masses ;
Effective temperatures
Keywords: stars: pre-main sequence - stars: formation -
open cluster and associations: general
Abstract:
Our aims are twofold: To determine the physical parameters of PMS
members in young open clusters (YOCs), and to check and compare the
performances of different model isochrones.
We compare UBVRI photometric observations of eleven YOCs to
theoretical isochrones in the photometric diagrams. The comparison
simultaneously provides membership assignments for MS and PMS stars
and estimates for the masses, ages, and spatial distribution of the
candidate members.
The relations found between the different cluster parameters show that
the procedure applied to assign cluster membership, and to measure
physical parameters for the selected members, is well founded.
Description:
Photometric colors in the UBVRI system for 27040 stars, in the fields
of 11 Young Open Clusters. The membership and physical parameters are
listed. For MS and post MS candidate members, only the mass value is
listed. It is calculated from comparison to ZAMS and isochrones by
Girardi et al. (2002A&A...391..195G 2002A&A...391..195G). For PMS candidate members, the
age, mass, luminosity, and effective temperature are listed as
obtained from comparison to four PMS model isochrones:
D'Antona and Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D), Palla and Stahler
(1999ApJ...525..772P 1999ApJ...525..772P), Siess et al. (2000A&A...358..593S 2000A&A...358..593S), and Yi et
al. (2001ApJS..136..417Y 2001ApJS..136..417Y).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 11 Clusters observed
catalog.dat 214 27040 Photometric results and physical parameters
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
15- 20 F6.2 deg GLON Galactic longitude
22- 26 F5.2 deg GLAT Galactic latitude
28- 31 F4.2 mag E(B-V) Colour excess
33- 36 F4.1 mag m-M Distance modulus
38- 40 F3.1 [yr] logAge Cluster age
42- 45 F4.2 [yr] e_logAge Error on Age
47- 48 I2 --- Nstar Number of star used in age calculation
50- 58 A9 --- OCL Cluster name as in file catalog.dat
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- OCL Cluster identification
11- 26 A16 --- 2MASS Identification in 2MASS (HHMMSSss+DDMMSSs)
28- 32 I5 --- Seq Own identification number of the star
34- 43 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
45- 54 F10.6 deg DEdeg Declination in decimal degrees (J2000)
56- 60 F5.2 mag Vmag Johnson V magnitude (1)
62- 66 F5.2 mag e_Vmag Error in V magnitude (1)
68- 72 F5.2 mag U-B ?=99.99 Johnson U-B colour index (1)
74- 78 F5.2 mag e_U-B ?=99.99 Error in U-B (1)
80- 84 F5.2 mag B-V ?=99.99 Johnson B-V colour index (1)
86- 90 F5.2 mag e_B-V ?=99.99 Error in B-V (1)
92- 96 F5.2 mag V-Rc ?=99.99 Johnson-Cousins V-Rc colour index (1)
98-102 F5.2 mag e_V-Rc ?=99.99 Error in V-Rc (1)
104-108 F5.2 mag V-Ic ?=99.99 Johnson-Cousins V-Ic colour index (1)
110-114 F5.2 mag e_V-Ic ?=99.99 Error in V-Ic (1)
116 I1 --- MmD [0/2] Membership according to D'Antona &
Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D) isochrones (2)
118-121 F4.1 Myr AgeD ?=99.9 Age according to D'Antona & Mazzitelli
(1997MmSAI..68..807D 1997MmSAI..68..807D) isochrones (1)
123-127 F5.2 Msun MassD ?=99.99 Mass according to D'Antona & Mazzitelli
(1997MmSAI..68..807D 1997MmSAI..68..807D) isochrones (1)
129-133 F5.2 [Lsun] logLD ?=99.99 Luminosity according to D'Antona &
Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D) isochrones (1)
135-139 F5.2 [K] logTeD ?=99.99 Effective temperature according to
D'Antona & Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D)
isochrones (1)
141 I1 --- MmP [0/2] Membership according to Palla & Stahler
(1999ApJ...525..772P 1999ApJ...525..772P) isochrones (2)
143-146 F4.1 Myr AgeP ?=99.9 Age according to Palla & Stahler
(1999ApJ...525..772P 1999ApJ...525..772P) isochrones (1)
148-152 F5.2 Msun MassP ?=99.99 Mass according to Palla & Stahler
(1999ApJ...525..772P 1999ApJ...525..772P) isochrones (1)
154-158 F5.2 [Lsun] logLP ?=99.99 Luminosity according to Palla &
Stahler (1999ApJ...525..772P 1999ApJ...525..772P) isochrones (1)
160-164 F5.2 [K] logTeP ?=99.99 Effective temperature according to
Palla & Stahler (1999ApJ...525..772P 1999ApJ...525..772P)
isochrones (1)
166 I1 --- MmS [0/2] Membership according to Siess et al.
(2000A&A...358..593S 2000A&A...358..593S) (2)
168-171 F4.1 Myr AgeS ?=99.9 Age according to Siess et al.
(2000A&A...358..593S 2000A&A...358..593S) isochrones (1)
173-177 F5.2 Msun MassS ?=99.99 Mass according to Siess et al.
(2000A&A...358..593S 2000A&A...358..593S) isochrones (1)
179-183 F5.2 [Lsun] logLS ?=99.99 Luminosity according to Siess et al.
(2000A&A...358..593S 2000A&A...358..593S) isochrones (1)
185-189 F5.2 [K] logTeS ?=99.99 Effective temperature according to
Siess et al. (2000A&A...358..593S 2000A&A...358..593S)
isochrones (1)
191 I1 --- MmY [0/2] Membership according to Yi et al.
(2001ApJS..136..417Y 2001ApJS..136..417Y) isochrones (2)
193-196 F4.1 Myr AgeY ?=99.9 Age according to Yi et al.
(2001ApJS..136..417Y 2001ApJS..136..417Y) isochrones (1)
198-202 F5.2 Msun MassY ?=99.99 Mass according to Yi et al.
(2001ApJS..136..417Y 2001ApJS..136..417Y) isochrones (1)
204-208 F5.2 [Lsun] logLYo ?=99.99 Luminosity according to Yi et al.
(2001ApJS..136..417Y 2001ApJS..136..417Y) isochrones (1)
210-214 F5.2 [K] logTeY ?=99.99 Effective temperature according to Yi
et al. (2001ApJS..136..417Y 2001ApJS..136..417Y) isochrones (1)
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Note (1): A 99.99 entry indicates a non-detection.
Note (2): Membership assignment as follows:
0 = No assignment
1 = MS or post-MS member
2 = PMS member
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Acknowledgements:
A.J. Delgado, delgado(at)iaa.es
(End) Antonio Jesus Delgado [IAA-CSIC], Patricia Vannier [CDS] 14-Jun-2011