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A search for Lambda Bootis stars in OB associations
A search for Lambda Bootis stars in two OB associations, Orion OB1 andLacerta OB1, has been carried out. One Lambda Bootis star has beendiscovered in the Orion OB1 association. In addition, nine A-type starswhich appear to be slightly metal weak have been found in the twoassociations. The Lambda Bootis star is situated on the Zero-Age MainSequence (ZAMS). The discovery of these stars strengthens the hypothesisthat the Lambda Bootis stars are related to a short-lived evolutionaryphase associated with the arrival of the star on the ZAMS.
| Walraven photometry of nearby southern OB associations
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A catalog of observational data is presented for stars in the region ofthe young stellar association Orion OB 1. Photoelectric observationsobtained in the uvby-beta and UBV systems are compiled along withprevious photoelectric and spectroscopic data for all these stars aswell as for several bright members of the association with availablephotometric indices. Mean weighted values are computed for thephotometric data and summarized in tables expected to be reasonablycomplete for association members earlier than spectral type A0.Membership criteria are derived, and qualitative membershipprobabilities summarized, for the 526 stars in the final program. Theanalytical procedures are discussed for association stars of B,intermediate, and AF types. Effects of the nebular environment andvarious calibrations of Balmer-line and four-color indices areconsidered for the determination of absolute magnitudes for the B-typestars.
| Metallicism in Border Regions of the AM Domain. I. Extremely Young AM Stars in the Orion 1c Association
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972ApJ...175..765S&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Orione |
| Ascensione retta: | 05h29m48.99s |
| Declinazione: | -07°38'35.3" |
| Magnitudine apparente: | 9.187 |
| Moto proprio RA: | 0.1 |
| Moto proprio Dec: | -0.8 |
| B-T magnitude: | 9.364 |
| V-T magnitude: | 9.202 |
Cataloghi e designazioni:
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