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J/A+A/428/149       Hipparcos parallaxes of O stars          (Schroeder+, 2004)

On the Hipparcos parallaxes of O stars. Schroeder S.E., Kaper L., Lamers H.J.G.L.M., Brown A.G.A. <Astron. Astrophys., 428, 149-157 (2004)> =2004A&A...428..149S
ADC_Keywords: Stars, O ; Parallaxes, trigonometric ; Magnitudes, absolute ; MK spectral classification Keywords: astrometry - stars: early-type - stars: fundamental parameters - stars: statistics Abstract: We compare the absolute visual magnitude of the majority of bright O stars in the sky as predicted from their spectral type with the absolute magnitude calculated from their apparent magnitude and the Hipparcos parallax. We find that many stars appear to be much fainter than expected, up to five magnitudes. We find no evidence for a correlation between magnitude differences and the stellar rotational velocity as suggested for OB stars by Lamers et al. (1997A&A...325L..25L), whose small sample of stars is partly included in ours. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 54 154 Characteristics of the O star sample. table2.dat 45 8 Characteristics of the B stars in the sample of Lamers et al., 1997A&A...325L..25L depicted in Fig. 5. refs.dat 43 14 References
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 8- 25 A18 --- SpType MK spectral type 27 I1 --- r_SpType Reference for SpType, when not Mason et al., 1998AJ....115..821M 29- 33 F5.2 mas plx Hipparcos parallax, corrected for interstellar extinction (AV) 35- 38 F4.2 mas e_plx rms uncertainty on plx 40- 43 F4.2 mag AV Interstellar extinction 45- 49 F5.1 mag VMAGH ? Hipparcos absolute magnitude 51- 54 F4.1 mag VMAGSK Predicted absolute magnitude, derived from the spectral type according to the calibration of Schmidt-Kaler et al. (G1)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 8- 15 A8 --- SpType MK spectral type 19- 23 F5.2 mas plx Hipparcos parallax, corrected for interstellar extinction (AV) and the presence of spectroscopic companions. 25- 28 F4.2 mas e_plx rms uncertainty on plx 30- 33 F4.1 mag VMAGH ? Hipparcos absolute magnitude 35- 38 F4.1 mag VMAGSK Predicted absolute magnitude, derived from the spectral type according to the calibration of Schmidt-Kaler et al. (G1) (1) 40- 42 I3 km/s vsini Rotation velocity 44- 45 I2 --- r_SpType ? Reference for SpType and vsini
Note (1): If necessary through interpolation (note that they have a special section for Be stars).
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference code 4- 22 A19 --- BibCode BibCode 24- 43 A20 --- Aut Author's name
Global notes: Note (G1): Schmidt-Kaler et al., 1982, Landolt-Boernstein: Numerical Data and Functional Relationships in Science and Technology - New Series, Group VI: Astronomy and Astrophysics, Volume 2b, Schaifers/Voigt, Astronomy and Astrophysics, Stars and Star Clusters
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Sep-2005
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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