J/A+A/501/297 Effective temperatures of B Supergiants (Zorec+, 2009)
Fundamental parameters of B Supergiants from the BCD System.
I. Calibration of the (lambda1, D) parameters into Teff.
Zorec J., Cidale L., Arias L., Fremat Y., Muratore M.F., Torres A.F.,
Martayan C.
<Astron. Astrophys. 501, 297 (2009)>
=2009A&A...501..297Z 2009A&A...501..297Z
ADC_Keywords: Stars, B-type ; Stars, supergiant ; Stars, diameters ;
Effective temperatures
Keywords: stars: early-type - stars: fundamental parameters
Abstract:
Effective temperatures of early-type supergiants are important to test
stellar atmosphere- and internal structure-models of massive and
intermediate mass objects at different evolutionary phases. However,
these Teff values are more or less discrepant depending on the method
used to determine them.
We aim to obtain a new calibration of the Teff parameter for
early-type supergiants as a function of observational quantities that
are: a) highly sensitive to the ionization balance in the photosphere
and its gas pressure; b) independent of the interstellar extinction;
c) as much as possible model-independent.
Description:
In table2, we present effective temperatures and angular diameters of
217 B-type stars of all luminosity classes. The effective temperatures
were determined with the bolometric-flux method and the angular
diameters were calculated by fitting the observed energy distributions
in the red spectral region with model atmospheres. The effective
temperatures were used to calibrate the BCD spectrophotometric
parameters (lambda1, D) given in the table, which were obtained with
spectra of low resolution around the Balmer discontinuity. The BCD
parameters are highly sensitive to the ionization balance in the
photosphere and its gas pressure, and they are independent of the
interstellar extinction.
Table5 is a compilation of effective temperatures of the program
stars determined by other authors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 77 217 Effective temperatures and angular diameters
table5.dat 55 217 Compilation of effective temperatures of the
program stars
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
9- 18 A10 --- MK MK Spectral Type-Luminosity Class (1)
20- 23 F4.1 0.1nm lam1 BCD parameter λ1-3700
26- 30 F5.3 --- D BCD Balmer discontinuity
33- 37 F5.3 mag E(B-V) ISM extinction; color excess (UBV photom.)
40- 44 I5 K Teff Effective temperature (bolom.-flux method)
47- 50 I4 K e_Teff Error of the Teff
53- 57 F5.3 mas theta Angular diameter (milli-arc-seconds)
60- 64 F5.3 mas e_theta Error of theta
67- 70 F4.2 --- gamma Far-UV flux-filling factor (see paper)
73- 77 I5 K TeffD Effective temperature read in the
(λ1,D) calibration
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Note (1): The notation > SpT/LC means that the spectral type is
cooler than the indicated one.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
9- 13 I5 K Teffb Effective temperature (bolom.-flux method)
16- 20 I5 K Teff1 ?=- Effective temperature from
Gulati et al. 1989A&AS...80...73G 1989A&AS...80...73G,
Castelli 1991A&A...251..106C 1991A&A...251..106C
23- 27 I5 K Teff2 ?=- Effective temperature from
Underhill et al. 1979MNRAS.189..601U 1979MNRAS.189..601U,
Code et al. 1976ApJ...203..417C 1976ApJ...203..417C,
Malagnini et al. 1986A&A...162..140M 1986A&A...162..140M
30- 34 I5 K Teff3 ?=- Effective temperature from
Remie & Lamers 1982A&A...105...85R 1982A&A...105...85R
37- 41 I5 K Teff4 ?=- Effective temperature from
Morossi & Malagnini 1985A&AS...60..365M 1985A&AS...60..365M,
Malagnini et al. 1983A&A...128..375M 1983A&A...128..375M,
Malagnini & Morossi 1990A&AS...85.1015M 1990A&AS...85.1015M
44- 48 I5 K Teff5 ?=- Effective temperature from
McErlean et al. 1999A&A...349..553M 1999A&A...349..553M,
Adelman et al. 2002A&A...392.1031A 2002A&A...392.1031A
51- 55 I5 K Teff6 ?=- Effective temperature from
Searle et al. 2008A&A...481..777S 2008A&A...481..777S,
Markova & Puls 2008A&A...478..823M 2008A&A...478..823M,
Crowther et al. 2006A&A...446..279C 2006A&A...446..279C
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Acknowledgements:
Jean Zorec, zorec(at)iap.fr
(End) Jean Zorec [IAP, CNRS-UMPC, Paris] Patricia Vannier [CDS] 17-Jun-2009