J/A+A/412/447 Velocities of λ Bootis stars (Gerbaldi+, 2003)
The heterogeneous class of λ Bootis stars.
Gerbaldi M., Faraggiana R., Lai O.
<Astron. Astrophys., 412, 447-464 (2003)>
=2003A&A...412..447G 2003A&A...412..447G
ADC_Keywords: Binaries, spectroscopic ; Stars, variable ; Radial velocities ;
Rotational velocities
Keywords: stars: atmospheres - stars: chemically peculiar -
stars: binaries: spectroscopic
Abstract:
We demonstrate that it is arduous to define the λ Boo stars as
a class of objects exhibiting uniform abundance peculiarities which
would be generated by a mechanism altering the structure of their
atmospheric layers. We collected the stars classified as λ Boo
up to now and discuss their properties, in particular the important
percentage of confirmed binaries producing composite spectra
(including our adaptive optics observations) and of misclassified
objects. The unexplained RV variables (and thus suspected binaries),
the known SB for which we lack information on the companion, the stars
with an UV flux inconsistent with their classification, and the fast
rotating stars for which no accurate abundance analysis can be
performed, are also reviewed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 49 136 Radial velocity and notes given in the BSC
(Cat. V/50) and projected rotational
velocities (vsini) from various sources.
table5.dat 61 147 *Reddening, atmospheric parameters and distance
in parsec computed from the Hipparcos parallaxes
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Note on table5.dat: HD 89353 (HR 4049) is not considered here (see Sect. 6).
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See also:
V/50 : Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)
J/A+A/381/105 : Rotational velocities of A-type stars. I. (Royer+, 2002)
J/A+A/393/897 : Rotational velocities of A-type stars II. (Royer+, 2002)
J/ApJS/99/135 : A-type stars rotation and spectral peculiarities (Abt+ 1995)
J/A+AS/122/51 : B to G stars calibration in Geneva photometry (Kunzli+, 1997)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- HR ? HR (Cat. V/50) number
5 A1 --- n_HR [*] Note (1)
7- 12 I6 --- HD HD (Cat. III/135) number
15- 17 I3 km/s RV ? Radial velocity
19- 22 A4 --- Note Notes from BSC (Cat. V/50) (2)
25- 27 I3 km/s Vrot ? vsini form Royer et al., (2002,
Cat. J/A+A/381/105 and J/A+A/393/897
28 A1 --- u_Vrot Uncertainty flag on VR
30- 32 I3 km/s VAM ? vsini from Abt & Morrell, 1995,
Cat. J/ApJS/99/135
33 A1 --- u_VAM Uncertainty flag on VAM
36- 37 A2 --- l_VUF [≤ ] Limit flag on VUF
38- 40 I3 km/s VUF ? vsini from Uesugi & Fukuda, 1982, Revised
Catalogue of Stellar Rotational Velocities
41 A1 --- u_VUF [:] Uncertainty flag on VUF
42 A1 --- n_VUF [*] *: UF gives this value for HD 11502.
44- 45 A2 --- l_VHR [≤ ] Limit flag on VHR
46- 48 I3 --- VHR ? vsini from BSC/CDS (V/50)
49 A1 --- u_VHR Uncertainty flag on VHR
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Note (1): Notes:
HD 11503 has a wrong HR number in BSC:
HR 545 = HD 11502 and HR 546 = HD 11503.
HD 193256: vsini=240km/s, according to Holweger & Rentzsch-Holm
(1995A&A...303..819H 1995A&A...303..819H).
Note (2): BSC notes:
V: radial velocity variability
V?: suspected variability
SB: spectroscopic binary
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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
8- 10 A3 --- Rem1 Remark from the Hauck & Mermilliod Catalogue
(1998, Cat. II/215) (1)
12- 17 F6.3 mag E(b-y) ? Reddening
19- 23 I5 K Teff ? Effective temperature computed with the Moon &
Dworessky (1985MNRAS.217..305M 1985MNRAS.217..305M, MD)
programme according to the value of the group
25- 28 F4.2 [cm/s2] logg ? Surface gravity computed with the MD
programme according to the value of the group
31 I1 --- Gr ? Group value (MD, 1985MNRAS.217..305M 1985MNRAS.217..305M)
33- 37 I5 K TeffG ? Effective temperature computed with the
Kunzli et al. (1997, Cat. J/A+AS/122/51)
programme
39- 42 F4.2 [cm/s2] loggG ? Surface gravity computed with the
Kunzli et al. (1997, Cat. J/A+AS/122/51)
programme
44- 48 F5.2 [Sun] [M/H] ? Metallicity
51- 53 A3 --- Rem2 Remarks from Geneva photometry (1)
56- 58 I3 pc Dist ? Distance
60- 61 A2 --- UVCat UV flux category (3)
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Note (1): Variability (V) and indication of the component(s) observed
for binaries (A or AB).
Note (3): TD1 groups described in Sect. 10:
1 stars for which the observed flux is lower than the one predicted
for solar abundances,
2 stars for which the observed flux is fitted by that computed with
the solar abundance or close to it
3a stars for which the observed flux cannot be fitted by any model
either because the UV flux is too high
3b stars for which the observed flux is distorted compared to the
theoretical one
4 stars with an observed flux fitted by the computed one with metal
underabundance
5 the spectra of these stars are fitted by spectra based on
[M/H]=-1.0 except for the observed magnitude at 1565Å which
is too low
* indicates that the star has not been observed by this satellite
- is given when no visual photometry is available and
: when the TD1 values have a too large error to be used.
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 16-Jan-2004