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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
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:
FileName Lrecl Records Explanations
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
Note on table5.dat: HD 89353 (HR 4049) is not considered here (see Sect. 6).
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
Bytes Format Units Label Explanations
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
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). Note (2): BSC notes: V: radial velocity variability V?: suspected variability SB: spectroscopic binary
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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, 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) 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)
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.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 16-Jan-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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