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J/A+A/391/1039  Effective temperature of metal-poor A-type stars (Kinman+, 2002)

The determination of Teff for metal-poor A-type stars using V and 2MASS J, H and K magnitudes Kinman T., Castelli F. <Astron. Astrophys. 391, 1039 (2002)> =2002A&A...391.1039K
ADC_Keywords: Stars, A-type ; Effective temperatures ; Photometry, infrared Keywords: stars: fundamental parameters (temperatures) - stars: horizontal-branch Abstract: Effective temperatures (Teff) can be determined from (V-J)0, (V-H)0 and (V-K)0 colours that are derived from 2MASS magnitudes. This gives another way to estimate the Teff of faint blue halo stars (V≲15) whose temperatures are now usually deduced from (BV)0_. Transformations (adapted from Carpenter, 2001AJ....121.2851C) are used to change colours derived from the 2MASS data to the Johnson system. Teff is then derived from these colours using an updated Kurucz model. Tables are given to derive Teff as a function of (V-J)0, (V-H)0 and (V-K)0 for a variety of metallicities and suitable for blue horizontal branch and main sequence stars. The temperatures obtained in this way are compared with those in the recent literature for various stars with 5≤V≤15 and Teff in the range 6500 to 9500K; systematic differences are ∼100K. An exception is the sample of BHB stars observed by Wilhelm et al. (1999, Cat. J/AJ/117/2329) whose Teff are significantly cooler than those we derive by an amount that increases with increasing temperature. Description: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 68 351 Effective temperatures and Johnson-Glass colours for blue horizontal branch (BHB) stars table3.dat 93 401 Effective Temperatures and Johnson-Glass colours for blue metal poor (BMP) stars with logg=4.0 or 4.5
See also: B/2mass : The 2MASS database (IPAC/UMass, 2000) J/AJ/117/2329 : Spectroscopy of hot stars in the halo. III (Wilhelm+, 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 K Teff Effective temperature 7- 12 F6.3 mag (V-J)-1 (V-J) colour index for [Fe/H]=-1.0 14- 19 F6.3 mag (V-H)-1 (V-H) colour index for [Fe/H]=-1.0 21- 26 F6.3 mag (V-K)-1 (V-K) colour index for [Fe/H]=-1.0 28- 33 F6.3 mag (V-J)-1.5 (V-J) colour index for [Fe/H]=-1.5 35- 40 F6.3 mag (V-H)-1.5 (V-H) colour index for [Fe/H]=-1.5 42- 47 F6.3 mag (V-K)-1.5 (V-K) colour index for [Fe/H]=-1.5 49- 54 F6.3 mag (V-J)-2 (V-J) colour index for [Fe/H]=-2.0 56- 61 F6.3 mag (V-H)-2 (V-H) colour index for [Fe/H]=-2.0 63- 68 F6.3 mag (V-K)-2 (V-K) colour index for [Fe/H]=-2.0
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 F3.1 [cm/s2] logg Gravity surface (4.0 or 4.5) 5- 9 I5 K Teff Effective temperature 11- 16 F6.3 mag (V-J)0 (V-J) colour index for [Fe/H]=0.0 18- 23 F6.3 mag (V-H)0 (V-H) colour index for [Fe/H]=0.0 25- 30 F6.3 mag (V-K)0 (V-K) colour index for [Fe/H]=0.0 32- 37 F6.3 mag (V-J)-1 (V-J) colour index for [Fe/H]=-1.0 39- 44 F6.3 mag (V-H)-1 (V-H) colour index for [Fe/H]=-1.0 46- 51 F6.3 mag (V-K)-1 (V-K) colour index for [Fe/H]=-1.0 53- 58 F6.3 mag (V-J)-1.5 (V-J) colour index for [Fe/H]=-1.5 60- 65 F6.3 mag (V-H)-1.5 (V-H) colour index for [Fe/H]=-1.5 67- 72 F6.3 mag (V-K)-1.5 (V-K) colour index for [Fe/H]=-1.5 74- 79 F6.3 mag (V-J)-2 (V-J) colour index for [Fe/H]=-2.0 81- 86 F6.3 mag (V-H)-2 (V-H) colour index for [Fe/H]=-2.0 88- 93 F6.3 mag (V-K)-2 (V-K) colour index for [Fe/H]=-2.0
Acknowledgements: Tom Kinman
(End) Patricia Bauer [CDS] 23-Jul-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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