J/A+A/353/287 The R CrB stars (Asplund+, 2000)
The R Coronae Borealis stars - atmospheres and abundances
Asplund M., Gustafsson B., Lambert D.L., Rao N.K.
<Astron. Astrophys. 353, 287 (2000)>
=2000A&A...353..287A 2000A&A...353..287A
ADC_Keywords: Stars, variable ; Abundances
Keywords: stars: abundances - stars: AGB and post-AGB - stars: evolution -
stars: variables: general - stars: individual: R Coronae Borealis -
stars: individual: Sakurai's object -
Description:
Adopted line data, measured equivalent widths and derived elemental
abundances for the individual lines observed in R Coronae Borealis and
Extreme Helium stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 61 19 Star positions (from SIMBAD database)
table3.dat 54 2015 *Adopted line data and measured equivalent
widths in RCrB and EHe stars.
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Note on table3.dat:
It should be noted that some of the lines listed were only used in the
determinations of the stellar parameters and not in the final
abundance determinations. Furthermore, several lines were later
discarded due to suspected blends or uncertain gf-values. No
abundances are given for the HeI and CII lines since they have mainly
been used as diagnostics of the stellar parameters using spectral
synthesis. The CI lines consist of two groups with gf-values taken for
the first group (with increasing wavelengths) from the Opacity Project
(Luo & Pradhan 1989, J. Phys. B. 22, 3377; Seaton et al., 1994,
Cat. VI/80) and the second group (also with increasing wavelengths)
from Kurucz & Peytremann (1975, , SAO Special Report 362). The
latter lines have not been used for the abundance determinations due
to their significantly larger scatter.
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See also:
VI/80 : Opacities from the Opacity Project (Seaton+, 1995)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Star Star name
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 35 I2 arcsec DEs Declination (J2000)
39- 43 F5.2 mag Bmag ? B magnitude
45- 49 F5.2 mag Vmag ? V magnitude
51- 61 A11 --- SpType Spectral type (from Simbad)
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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- 2 A2 -- Elem Chemical element
4 I1 --- Ion [1/2] Ionization stage
6- 12 F7.2 0.1nm lambda Wavelength {lamda} in Å
14- 18 F5.2 eV Exc Lower excitation potential
20- 25 F6.2 --- loggf Oscillator strength
27 A1 --- l_EW Limit flag on EW
28- 32 F5.1 0.1pm EW Equivalent width (in mÅ)
34 A1 --- l_Abund Limit flag on Abund
35- 39 F5.2 [-] Abund ? Logarithmic elemental abundance (H=12)
42- 54 A13 --- Star Star identification
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Acknowledgements: Martin Asplund
(End) M. Asplund [Uppsala, Sweden] 01-Nov-1999