J/A+A/427/933 Precise temperature of F-K field dwarfs (Kovtyukh+, 2004)
A new Boehm-Vitense gap in the temperature range 5560 to 5610K in
the main sequence.
Kovtyukh V.V., Soubiran C., Belik S.I.
<Astron. Astrophys., 427, 933-936 (2004)>
=2004A&A...427..933K 2004A&A...427..933K
ADC_Keywords: Stars, dwarfs ; Effective temperatures ; Magnitudes, absolute
Keywords: stars: fundamental parameters - convection -
stars: Hertzsprung-Russell (HR) and C-M diagrams - stars: abundances
Abstract:
Highly precise temperatures (sigma=10-15K) have been determined from
line depth ratios for a set of 248 F-K field dwarfs of about solar
metallicity (-0.5<[Fe/H]<+0.4), based on high resolution (R=42000),
high S/N echelle spectra. A new gap has been discovered in the
distribution of stars on the Main Sequence in the temperature range
5560 to 5610K. This gap coincides with a jump in the microturbulent
velocity Vt and the well-known Li depression near 5600K in field
dwarfs and open clusters. As the principal cause of the observed
discontinuities in stellar properties we propose the penetration of
the convective zone into the inner layers of stars slightly less
massive than the Sun and related to it, a change in the temperature
gradient.
Description:
The spectra used in this paper were extracted from the most recent
version of the library of stellar spectra collected with the ELODIE
echelle spectrograph at the Observatoire de Haute-Provence by Soubiran
et al. (1998, Cat. J/A+AS/133/221) and Prugniel & Soubiran (2001,
Cat. III/218).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 249 Program stars
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See also:
III/218 : ELODIE archive (Prugniel+, 2001)
J/A+AS/133/221 : Library of ELODIE spectra (F5-K7 stars) (Soubiran+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Star name
12- 15 I4 K Teff Effective temperature
17- 19 I3 --- N Number of calibrations used
21- 24 F4.1 K e_Teff rms uncertainty on Teff
26- 29 F4.2 [cm/s2] logg Surface gravity
31- 34 F4.2 km/s Vt Microturbulent velocity
36- 40 F5.2 Sun [Fe/H] Metallicity
42- 46 F5.3 mag VMAG ? Absolute V magnitude
48- 52 F5.3 mag B-V ? Johnson B-V colour index
54- 68 A15 --- Rem Remarks
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Sep-2005