J/A+AS/137/273 Reference A0V stars (Gerbaldi+ 1999)
Search for reference A0 dwarf stars: masses and luminosities revisited with
Hipparcos parallaxes
Gerbaldi M., Faraggiana R., Burnage R., Delmas F., Gomez A.E.,
Grenier S.
<Astron. Astrophys. Suppl. Ser. 137, 273 (1999)>
=1999A&AS..137..273G 1999A&AS..137..273G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Stars, A-type ; Photometry, uvby, beta ;
Parallaxes, trigonometric
Keywords: stars: fundamental parameters - stars: early-type - stars: HR diagram
Abstract:
Hipparcos data for 71 nearby dwarf A0 stars were combined with other
data, in particular with high resolution spectra to establish the HR
diagram in this temperature range. Almost 30% of unknown binaries were
detected and discarded before establishing the M-L relation for bright
A0 V field stars. The relationship derived for these single stars is
compared to the classical diagram derived from eclipsing binaries. The
scatter of the latter is examined and the role of gravity is
discussed. A good agreement is found between the evolution-based
surface gravity loggev and the value of loggph obtained from
photometric data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 71 The programme stars
table2.dat 112 72 Photometric, astrometric data and atmospheric
parameters
table3.dat 147 73 Summary of the spectral analysis
table4.dat 59 48 Parameters computed from the HR diagram and
evolutionary tracks for the reduced sample
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
V/50 : Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)
J/ApJS/99/135 : 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: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD (Cat. III/135) number
8- 11 I4 --- HR ? HR (Cat. V/50) number
13- 21 A9 --- SpType Spectral Type (BSC, Cat. V/50) (1)
23- 46 A24 --- SpType2 Spectral type (Abt and Morrell, 1995,
Cat. J/ApJS/99/135)
48- 50 F3.1 --- Dmag ? Magnitude difference (BSC, Cat. V/50)
52- 54 F3.1 arcsec Sep ? Angular separation (BSC, Cat. V/50)
56- 60 F5.3 arcsec Bin ? Binarity by speckle
61 A1 --- n_Bin [*n] n: no detection, *: see Remarks column
63- 64 A2 --- l_Vrot [≤ ] Limit flag on Vrot
65- 67 I3 km/s Vrot ? Rotational velocity (BSC, Cat. V/50)
69 A1 --- l_Vrot2 Limit flag on Vrot2
70- 72 I3 km/s Vrot2 ? Rotational velocity (Abt and Morrell, 1995,
Cat. J/ApJS/99/135)
73 A1 --- u_Vrot2 Uncertainty flag on Vrot2
75-114 A40 --- Rem Remarks
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Note (1): When *, the note in the column Remarks concern the spectral type
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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 (Cat. III/135) number
8- 13 F6.3 mag b-y ? (b-y) color from uvbyBeta photometric system
15- 19 F5.3 mag m1 ? m1 index from uvbyBeta photometric system
21- 25 F5.3 mag c1 ? c1 index from uvbyBeta photometric system
27- 31 F5.3 mag beta ? Beta from uvbybeta photometric system
33 I1 --- Group ? Group number for program UVBYBETA
(Moon, 1985Ap&SS.117..261M 1985Ap&SS.117..261M)
35- 39 F5.2 mag E(b-y) ? Reddening E(b-y)
41- 45 I5 K Teff ? Teff from Moon and Dworetsky
(1985MNRAS.217..305M 1985MNRAS.217..305M) calibration
47- 50 F4.2 [cm/s2] logg ? log g from Moon and Dworetsky
(1985MNRAS.217..305M 1985MNRAS.217..305M) calibration
52- 56 I5 K Teff2 ? Teff from Kunzli et al. (1997,
Cat. J/A+AS/122/51) calibration
58- 61 F4.2 [cm/s2] logg2 ? log g from Kunzli et al. (1997,
Cat. J/A+AS/122/51) calibration
63- 64 A2 --- l_Broad [≤ ] Limit flag on Broad
65- 67 I3 km/s Broad ? Broadening value or lower value if interval
68 A1 --- --- [±]
69- 71 I3 km/s Broad2 ? Upper broadening value when interval
73- 77 F5.2 mas plx ? Parallax from Hipparcos (Cat. I/239)
79- 82 F4.2 mas e_plx ? Relative error on the parallax from
Hipparcos Catalogue (Cat. I/239)
84- 88 F5.2 mag VMAG Absolute magnitude Mv
90- 93 F4.2 mag e_VMAG Error on Mv
95-100 I6 --- HIP HIP (Cat. I/239) number
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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- 6 I6 --- HD HD (Cat. III/135) number
8- 22 A15 --- Cross Comments on the cross correlation curve
24- 49 A26 --- Hgamma Comments on the comparison between observed
and computed Hgamma profile
51- 70 A20 --- MgII Comments on the comparison between observed
and computed MgII profile
72- 95 A24 --- metal Comments on the comparison between observed
and computed metal lines
97-142 A46 --- Rem Remarks
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD (Cat. III/135) number
8- 11 F4.2 [solLum] logL Logarithm of the star luminosity
13- 16 F4.2 [solLum] e_logL Error on the log L
18- 21 F4.2 solMass Mass Mass of the star
23- 26 F4.2 solMass e_Mass Error on the mass
28- 31 F4.2 solRad Rad Radius of the star
33- 36 F4.2 [cm/s2] logg(ev) Gravity surface calculated with the mass
determined with stellar evolution models
38- 41 F4.2 [cm/s2] e_logg(ev) Error on logg(ev)
43- 46 F4.2 [yr] logAge Logarithm of the age
48- 50 I3 % e_logAge Error on the age
52- 57 I6 --- HIP HIP (Cat. I/239) number
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Acknowledgements: Michele Gerbaldi
(End) Patricia Bauer [CDS] 06-Apr-1999