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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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| A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars
Rotational velocity vsin i and mean radial velocity are presented for asample of 231 Ib supergiant stars covering the spectral region F, G andK. This work is the second part of the large survey carried out with theCORAVEL spectrometer to establish the behavior of the rotation for starsevolving off the main sequence (De Medeiros & Mayor 1999). Thesedata will add constraints to the study of the rotational behavior inevolved stars, as well as solid information concerning tidalinteractions in binary systems and on the link between rotation,chemical abundance and activity in stars of intermediate masses. Basedon observations collected at the Haute-Provence Observatory,Saint-Michel, France and at the European Southern Observatory, La Silla,Chile Table 1 is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/395/97
| Colour excesses of F-G supergiants and Cepheids from Geneva photometry.
A reddening scale for F-G supergiants and Cepheids is presented.Supergiants with low reddenings or in clusters form the basis of thecalibration. In this sense, it is entirely empirical. The data have beenobtained in the Geneva photometric system. Comparisons with otherreddening scales show no disagreement. The only problem is with Fernie'sscale for Cepheids (1990), where a systematic trend exists. Its originis not clear. It is suggested to extend the number of supergiants withindependently obtained colour excesses in order to test the existence ofa possible luminosity dependence of the calibration. A period-colourrelation for Cepheids is deduced, on the basis of the present reddeningcorrections. It gives strong support for V473 Lyr being a secondovertone pulsator.
| Carbon, nitrogen and oxygen abundances in yellow supergiants.
Carbon, nitrogen and oxygen abundances were measured in a sample of 9yellow supergiants for which accurate rotational velocities are nowavailable. We obtain [O/Fe]=~-0.2, a result consistent with other youngobjects (main sequence B stars, planetary nebulae, H II regions). Wealso find [C/Fe]=~-0.2 for 7 stars, and =~0.0 for another 2 ones, and[N/Fe]=~0.0 for 6 stars and =~+0.2 for the other 3 ones. Stars showinglow carbon and/or high nitrogen are assumed to show convective mixingeffects. The present results seem to indicate that, among the lowrotation supergiants located near the rotational discontinuity at F9Ib,a fraction of them shows no mixing, and another fraction does showmixing effects, probably depending on their evolutionary stage.
| The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.
| Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
| Geneva intrinsic colours of the supergiants of spectral types A and F
The aim of this research note is to expose a photometric method todetermine the intrinsic values of the Geneva color index (B2-V1) for thesupergiants of spectral types A and F. The different stages which led tothis objective are presented, and the method is tested with a few starsbelonging to clusters for which color excesses were found in theliterature. A list of stars classified as supergiants which behavephotometrically as dwarfs is indicated.
| O stars and supergiants south of declination -53 0.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976AJ.....81..116H&db_key=AST
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Observation and Astrometry data
| Constellation: | りゅうこつ座 |
| Right ascension: | 10h15m30.43s |
| Declination: | -60°44'16.4" |
| Apparent magnitude: | 8.559 |
| Distance: | 3846.154 parsecs |
| Proper motion RA: | -6 |
| Proper motion Dec: | 4.7 |
| B-T magnitude: | 9.208 |
| V-T magnitude: | 8.613 |
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