J/A+A/378/861 Spectroscopy of Be stars (Chauville+, 2001)
High and intermediate-resolution spectroscopy of Be stars.
An atlas of Hγ, He I 4471 and Mg II 4481 lines.
Chauville J., Zorec J., Ballereau D., Morrell N., Cidale L., Garcia A.
<Astron. Astrophys. 378, 861 (2001)>
=2001A&A...378..861C 2001A&A...378..861C
ADC_Keywords: Stars, Be ; Spectroscopy
Keywords: stars: emission-line, Be - stars: fundamental parameters -
stars: spectroscopy
Description:
The 270 spectra enclosed are those used in the atlas and are described
in the Table 1 of the paper: stars with magnitudes and spectral types,
dates of observations and other data.
All are normalized and corrected from the radial velocity due to Earth
movement, but not corrected from the radial velocity of the star
itself. The heliocentric Julian day of the mid-exposure appears in the
header with a comment keyword. Very often it cannot be derived by a
simple formula from the beginning and the time exposure, when the
spectrum is the result of the sum of several successive ones, or when
clouds have obliged to interrupt the exposure. For this reason, it is
always indicated.
The HD number of the star appears always in the name of the file, with
additional letters to distinguish the different spectra of a same
star.
The tracings of the atlas (72 FITS files) are described in the
subsection 2.4 of the paper and available with the electronic version.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 73 270 Star positions and spectrum characteristics
table2.dat 116 209 Measurements carried out on the photospheric-like
component of the Hγ line
table3.dat 54 242 Measurements carried out on the HeI 4471 line
table4.dat 77 267 Measurements carried out on the MgII 4481 line
table5.dat 30 260 Measurements carried out on the FeII 4351 line
table6.dat 43 116 Vsini determinations and other fundamental
parameters
table7.dat 37 146 Model circumstellar envelope parameters
tables.tex 121 1465 LaTeX version of the tables
fit/* . 270 Spectra
--------------------------------------------------------------------------------
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD (Cat. III/135) number
11- 12 I2 h RAh Right ascension (J2000)
13 A1 --- --- [:]
14- 15 I2 min RAm Right ascension (J2000)
16 A1 --- --- [:]
17- 20 F4.1 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
25 A1 --- --- [:]
26- 27 I2 arcmin DEm Declination (J2000)
28 A1 --- --- [:]
29- 30 I2 arcsec DEs Declination (J2000)
32- 41 A10 "DD/MM/YYYY" ObsDate Observation date
43- 44 I2 h UTh Time of begin exposure
45 A1 --- --- [:]
46- 47 I2 min UTm Time of begin exposure
48 A1 --- --- [:]
49- 50 I2 s UTs Time of begin exposure
52- 58 F7.1 s ExpTime Exposition time
60- 74 A15 --- Fits Spectrum file name (in fig subdirectory) (1)
--------------------------------------------------------------------------------
Note (1): Name of the files:
If annnnnnb.fitj: Spectra of HD nnnnnn, taken with Aurelie
spectrograph at the OHP.
If nnnnnnab.fitj: Spectra of HD nnnnnn, taken at ESO or in Argentina.
All spectra are normalized and corrected to Sun.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD (Cat. III/135) number
8- 15 A8 "YY/MM/DD" Date Observation date
17- 23 F7.5 --- a a parameter (1)
25- 31 F7.5 --- b b parameter (1)
33- 40 F8.5 --- c c parameter (1)
42- 47 F6.3 0.1nm lambdac λc parameter (1)
49- 53 F5.3 --- rc rc = 1 - (Fλc/F*0) (2)
55- 60 F6.2 km/s Deltap ? Separation of the emission peaks
62- 67 F6.2 km/s Delta1/2 ? Full width at half maximum
69- 73 F5.3 --- rp ? Mean residual peak emission intensity
75- 80 F6.3 --- ra ? Intensity at the central absorption in the
emission component measured from the
photospheric-like profile
82- 87 F6.3 0.1nm lambda1 ? Wavelength where the emission rises from the
underlying photospheric-like line
(lambda1=λ1-4340Å)
88 A1 --- --- [-]
89- 94 F6.3 0.1nm lambda2 ? Wavelength where the emission rises from the
underlying photospheric-like line
(lambda2=λ2-4340Å)
96-101 F6.4 0.1nm W ? Equivalent width of the total emission above
the underlying photospheric-like
absorption (3)
103-108 F6.4 0.1nm W+ ? Equivalent width of the total emission in
both peaks above the underlying
photospheric-like absorption profile (3)
110-116 F7.4 0.1nm W- ? Total equivalent width of the absorption
below the underlying photospheric-like
absorption profile (3)
--------------------------------------------------------------------------------
Note (1): Parameters which characterize the empirically determined
photospheric absorption component of the line profile used to separate
the emission component:
ψ(λ) = exp{-[a*(λ-λc)b+c)]-1}
Note (2): rc = 1 - (Fλc/F*0) , where Fλc/F*0 is
the flux measured at the line center relative to the continuum
Note (3): the definitions are:
W = [(Fλ-F*λ)/F*o]dλ
W+ = above Fλ/F*o=1.0
W- = below Fλ/F*o=1.0
where F*λ is the underlying photospheric-like
absorption at the emission peaks wavelengths λp and F*o
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD Hd number
8- 15 A8 "YY/MM/DD" Date Observation date
17- 22 F6.3 --- lambdac λc (given in λ-4471Å)
24- 28 F5.3 --- Flc/F0 Central intensity in the line absorption,
Fλc/F*o
30- 34 F5.3 0.1nm delta1/2 Full width at half maximum
36- 41 F6.3 0.1nm lambda1 Wavelength λ1
(given in λ1-4400Å)
42 A1 --- --- [-]
43- 48 F6.3 0.1nm lambda2 Wavelength λ2
(given in λ2-4400Å)
50- 54 F5.3 0.1nm EW Equivalent width of the line between which the
equivalent width was calculated (1)
--------------------------------------------------------------------------------
Note (1): For those HeI 4471 lines which are heavily blended with the
neighbouring MgII 4481 line, we calculated two equivalent widths.
The first estimate corresponds to the integration between the
indicated wavelengths (lambda1, lambda2) and the second is simply
twice the equivalent width of the blue half of the line. This last
is also preceded by the resulting (lambda1, lambda2) interval
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 -- HD HD (Cat. III/135) number
8- 15 A8 "YY/MM/DD" Date Observation date
17- 18 A2 --- Em [e12 c] Emission (e1 or e2) peaks or
MgII fine absorption lines (c) (1)
20- 25 F6.3 0.1nm lambdac ? Wavelength of the minimum in the absorption
line, given in λc-4481Å
27- 31 F5.3 --- Flc/F0 ? Central intensity in the line absorption,
Fλc/F*o,
33- 38 F6.3 km/s RVem ? Radial velocity of emission peak
40- 44 F5.3 --- Iem ? Intensity of emission peak
46- 50 F5.3 0.1nm delta1/2 ? Full width at half intensity, Δ1/2
52- 57 F6.3 0.1nm lambda1 ? Wavelength between which the equivalent
width was calculated (λ1 is given
in λ1-4400Å)
58 A1 --- --- [-]
59- 64 F6.3 0.1nm lambda2 ? Wavelength between which the equivalent
width was calculated (λ2 is given
in λ2-4400Å)
66- 70 F5.3 0.1nm W1 ? Equivalent width of the absorption
(or absorption component) (2)
72- 77 F6.3 0.1nm W2 ? Total equivalent width of the emission
components above the continuum (1)
--------------------------------------------------------------------------------
Note (1): When two emission peaks are seens, we measured the radial
velocity of each peak and its intensity. The emission peaks are
identified by the letters e1 and e2. Sometimes, at the bottom of the
relatively large Mg II line, appears a little fine absorption, and
even sometimes 2. Letter c concerns the top of this fine absorption.
Note (2): If there is no W2 value, W1 (positive) represents the
equivalent width of the absorption line;
if the is W2, W1 (negative) is the equivalent width of the sum of both
emission peaks above the continuum and W1 (positive) is the equivalent
width of the absorption component below the continuum
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD (Cat. III/135) number
8- 15 A8 "YY/MM/DD" Date Observation date
17 A1 --- Comp [eai] Component (1)
19- 24 F6.3 0.1nm lambda Wavelength of the Component (a, e or i)
in λ-4351Å
26- 30 F5.3 --- Fl/F0 Total intensity Fλ/F*o
--------------------------------------------------------------------------------
Note (1): e = emission component
a = absorption component
i = inflection
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD (Cat. III/135) number
8- 10 I3 km/s Vsini Rotational velocity
12- 13 I2 km/s e_Vsini ? rms uncertainty in Vsini
14 A1 --- r_Vsini [a] a: Vsini from Slettebak
(1982ApJS...50...55S 1982ApJS...50...55S)
16- 17 I2 --- n_Vsini ? Number of independent determinations of Vsini
19- 23 F5.3 [K] logTeff ? Adopted effective temperature (1)
25- 28 F4.2 [cm/s2] logg ? Adopted surface gravity (1)
30- 32 I3 km/s Vc Equatorial critical velocity
34- 35 I2 deg i Aspect angle (2)
37- 39 I3 deg di1 Deltai1 (2)
41- 43 I3 deg di2 Deltai2 (2)
--------------------------------------------------------------------------------
Note (1): Teff and logg were obtained in the fitting procedure
Note (2): Aspect angle determination:
i is for <ω≥0.795
i+di1 for <ω≥0.6 or <ω≥ωmin
i+di2 for V(<ω>) = Vc
In stars where apparently Vsini>Vc, we considered i=90°
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD (Cat. III/135) number
8- 15 A8 "YY/MM/DD" Date Observation date
17- 21 F5.3 --- tauo τo parameter (1)
23- 25 I3 --- DeltaD ΔD parameter (1)
27- 31 F5.3 --- Sl/F*0 Sl/F*o parameter (1)
33- 37 F5.3 --- Re/R*L1/2 (Re/R*)Λ1/2 parameter (1)
--------------------------------------------------------------------------------
Note (1): The parameters used in fig. 12 are defined as follow:
γ = [(Re/R*)2xΛ - 1](Sl/F*o)
τo = (π1/2e2/mc2)λHgammafNT/δD
See Sect. 5.4 of the paper.
--------------------------------------------------------------------------------
Acknowledgements: Juan Zorec
(End) Patricia Bauer [CDS] 28-Aug-2001